feat(custom): let readers add their own games and events

The interface for PRD F13. A game (name and lane colour) and events against it,
or against a tracked game when a source missed one, managed from the settings
panel and from the event's own detail sheet.

Two things the forms are careful about:

- "I don't know when it ends" is an offered answer, not a blank field. A
  mandatory end date would push the reader into inventing one, which is the
  failure the parsers are forbidden from committing — it would just be the
  reader committing it instead. An unknown end behaves as it does for a scraped
  event: no countdown, no checklist.
- A hand-entered date is never dressed up as a source's. The row carries a
  "yours" chip, the sheet says so under the title, and the Source link is absent
  rather than dead.

Deleting a game is refused while it still holds events, and says how many.
Deleting an event leaves the marks and ticks attached to it alone.

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>

CLAUDE.md

@@ -76,15 +76,17 @@ re-verify a sample against the live page afterward.
 
 ```
 src/shared/       schema.ts (the contract), time.ts, daily.ts, effort.ts, games.ts, feed.ts
+                  custom.ts — reader-authored games and events, and their key spaces
 src/ingest/       html.ts, dates.ts (nine formats), merge.ts, sanitize.ts, robots.ts, snapshots.ts
   parsers/        game8.ts, wikigg.ts, akwiki.ts — keyed by SITE, not game
   adapters/       index.ts — SOURCES registry binding url+game+parser, and the sanitize seam
 src/client/       React app, service worker, manifest
   state/          progress, daily log, ignores, prefs, sort — all localStorage
+                  useCustom.ts — the reader's own games and events (PRD F13)
                   lens.ts — who sees which rows (focus, outstanding, next-to-expire); pure
 scripts/          build-feed.ts, parse-fixture.ts (offline), refresh-sources.ts (fetches)
 serve.ts          static server + /api/health
-test/             366 tests
+test/             396 tests
 fixtures/<game>/  raw HTML + .expected.json per source — pinned, kept forever
 snapshots/        current page per source, rewritten by refresh — see its README
 ```
@@ -229,6 +231,29 @@ event's length. It adds **no schema field**, so the feed contract is untouched.
   recording agreement would freeze today's guess and stop a better parser from ever reaching that
   event. Neither control ever deletes a mark or a logged day, so both are reversible.
 
+## Events the reader entered themselves
+
+No adapter list covers a ten-game player, so a reader can define a game and type in events
+(PRD F13, `src/shared/custom.ts`, `src/client/state/useCustom.ts`). They join the same lists,
+timeline, sort, filters, progress, ignore and daily stores as scraped events. Four rules:
+
+- **Their ids live in their own spaces**: `mygame:<slug>` and `myevent:<random>`. Never
+  `${game}:${slug}:${date}` — a reader can type a scraped event's exact title and date, and that
+  collision would silently share one completion mark and one streak between two events. Random also
+  means renaming their own event never moves its id. `dailies`, `mygame` and `myevent` are reserved
+  first segments and **none may ever become a `GameId`**; a test pins this.
+- **Nothing they type enters the ingest pipeline.** `sanitize.ts` and `merge.ts` are for pages we do
+  not control. Their events are not fetched, parsed, merged, scored or quarantined.
+- **A hand-entered date is never attributed to a source.** No `sourceUrl`, no source link, and the
+  row and detail sheet both say it is theirs. `"I don't know when it ends"` is an offered answer, for
+  the same reason the parsers are forbidden from guessing one.
+- **They are in the export.** These exist in one browser and nowhere else, so an export without them
+  is a lossy backup. Import merges by id and never removes.
+
+A lane may now be a game the reader invented, so `gameMeta` is a context resolver (`metaFor`, pure
+and total) rather than a direct lookup — a lane can outlive its game when an import carries an event
+whose game did not come with it.
+
 ## Conventions
 
 - **Zod schemas are the single source of truth for types.** Derive with `z.infer<>`; never

src/client/App.tsx

@@ -463,6 +463,17 @@ export function App() {
         onToggleGame={toggleGame}
         onUpdate={update}
         ignoredCount={Object.keys(ignored.marks).length}
+        own={{
+          games: custom.games,
+          events: custom.events,
+          // Every lane, not just theirs: a source can miss an event in a game
+          // we do track, and that is the same job with the same form.
+          lanes: games,
+          onAddGame: custom.addGame,
+          onEditGame: custom.editGame,
+          onRemoveGame: custom.removeGame,
+          onAddEvent: custom.addEvent,
+        }}
         onExport={() =>
           exportProgress(prog.progress, daily.logs, ignored.marks, prefs, {
             games: custom.games,
@@ -524,6 +535,17 @@ export function App() {
           onNote={prog.setNote}
           onIgnore={(id) => toggleIgnored(id, openRow.event.title)}
           onClose={() => setOpenId(null)}
+          own={
+            custom.events[openRow.event.id] === undefined
+              ? undefined
+              : {
+                  record: custom.events[openRow.event.id]!,
+                  lanes: games,
+                  games: custom.games,
+                  onSave: custom.editEvent,
+                  onDelete: custom.removeEvent,
+                }
+          }
         />
       )}
     </Shell>

src/client/components/Controls.tsx

@@ -2,6 +2,7 @@ import type { LaneId } from "../../shared/custom.ts";
 import type { Region } from "../../shared/schema.ts";
 import { useGameMeta } from "../state/gameMeta.tsx";
 import type { Prefs } from "../state/usePrefs.ts";
+import { YourOwn } from "./YourOwn.tsx";
 
 const REGIONS: Array<{ id: Region; label: string }> = [
   { id: "america", label: "America" },
@@ -17,6 +18,7 @@ export function Controls({
   ignoredCount,
   onExport,
   onImport,
+  own,
 }: {
   games: LaneId[];
   prefs: Prefs;
@@ -25,6 +27,8 @@ export function Controls({
   ignoredCount: number;
   onExport: () => void;
   onImport: (file: File) => void;
+  /** Everything the reader entered themselves, and the ways to change it. */
+  own: React.ComponentProps<typeof YourOwn>;
 }) {
   const gameMeta = useGameMeta();
   return (
@@ -127,12 +131,14 @@ export function Controls({
         </div>
       </div>
 
+      <YourOwn {...own} />
+
       <div className="mt-6 border-t border-hairline pt-4">
         <p className="eyebrow">Your progress</p>
         <p className="mt-1.5 max-w-md text-xs leading-relaxed text-faint">
           What you've finished, and every daily you've ticked off, are saved in
-          this browser only — there is no account. Move them to another device
-          with a file.
+          this browser only — there is no account. Anything you added yourself is
+          in there too. Move it all to another device with a file.
         </p>
         <div className="mt-3 flex gap-2">
           <button

src/client/components/CustomForms.tsx

@@ -0,0 +1,343 @@
+import { useState } from "react";
+import {
+  isCustomGameId,
+  type CustomEvent,
+  type CustomGames,
+  type LaneId,
+} from "../../shared/custom.ts";
+import { EventType } from "../../shared/schema.ts";
+import { useGameMeta } from "../state/gameMeta.tsx";
+import { readerInstant, type EventDraft } from "../state/useCustom.ts";
+
+/**
+ * Entering a game and an event yourself (PRD F13).
+ *
+ * The forms deliberately mirror what a parser is allowed to produce rather than
+ * what a database column will accept — most of all, **"I don't know" is a
+ * first-class answer for the end date.** A form that made the end mandatory
+ * would force a reader to invent one, which is the single failure this whole
+ * product is built to avoid; it just happens to be the reader inventing it
+ * instead of us.
+ */
+
+/** Enough hues to tell lanes apart, none of them colliding with a tracked game. */
+const HUES = [
+  "#C74B50",
+  "#E08A3C",
+  "#D9C34A",
+  "#5FBF6A",
+  "#4FB3C4",
+  "#5C7CE0",
+  "#9B6FD1",
+  "#D46FA8",
+];
+
+const TYPES = EventType.options;
+
+function labelClass(): string {
+  return "block text-xs font-medium text-muted";
+}
+
+function inputClass(): string {
+  return "mt-1 w-full rounded-lg border border-hairline bg-ground px-3 py-2 text-sm text-ink outline-none focus:border-faint";
+}
+
+export function GameForm({
+  initial,
+  onSave,
+  onCancel,
+}: {
+  initial?: { name: string; hue: string } | undefined;
+  onSave: (name: string, hue: string) => void;
+  onCancel: () => void;
+}) {
+  const [name, setName] = useState(initial?.name ?? "");
+  const [hue, setHue] = useState(initial?.hue ?? HUES[0]!);
+  const valid = name.trim().length > 0 && name.trim().length <= 40;
+
+  return (
+    <form
+      className="mt-3 rounded-xl border border-hairline p-3"
+      onSubmit={(e) => {
+        e.preventDefault();
+        if (valid) onSave(name, hue);
+      }}
+    >
+      <label className={labelClass()}>
+        Game name
+        <input
+          autoFocus
+          value={name}
+          maxLength={40}
+          onChange={(e) => setName(e.target.value)}
+          placeholder="Limbus Company"
+          className={inputClass()}
+        />
+      </label>
+
+      <p className={`${labelClass()} mt-3`}>Lane colour</p>
+      <div className="mt-1.5 flex flex-wrap gap-1.5">
+        {HUES.map((h) => (
+          <button
+            key={h}
+            type="button"
+            aria-label={`Use colour ${h}`}
+            aria-pressed={hue === h}
+            onClick={() => setHue(h)}
+            className={`size-7 rounded-full border-2 transition-transform ${
+              hue === h ? "scale-110 border-ink" : "border-transparent"
+            }`}
+            style={{ background: h }}
+          />
+        ))}
+      </div>
+
+      <div className="mt-4 flex gap-2">
+        <button
+          type="submit"
+          disabled={!valid}
+          className="rounded-lg border border-transparent bg-ink px-3 py-1.5 text-xs font-medium text-ground transition-colors disabled:opacity-40"
+        >
+          Save game
+        </button>
+        <button
+          type="button"
+          onClick={onCancel}
+          className="rounded-lg border border-hairline px-3 py-1.5 text-xs text-muted transition-colors hover:text-ink"
+        >
+          Cancel
+        </button>
+      </div>
+    </form>
+  );
+}
+
+/** Split a stored instant back into the date and time a form field wants. */
+function fields(iso: string | null): { date: string; time: string } {
+  if (iso === null) return { date: "", time: "" };
+  const d = new Date(iso);
+  const pad = (n: number) => String(n).padStart(2, "0");
+  return {
+    date: `${d.getFullYear()}-${pad(d.getMonth() + 1)}-${pad(d.getDate())}`,
+    time: `${pad(d.getHours())}:${pad(d.getMinutes())}`,
+  };
+}
+
+export function EventForm({
+  lanes,
+  customGames,
+  initial,
+  onSave,
+  onCancel,
+}: {
+  /** Every lane an event can belong to — a source can miss an event too. */
+  lanes: LaneId[];
+  customGames: CustomGames;
+  initial?: CustomEvent | undefined;
+  onSave: (draft: EventDraft) => void;
+  onCancel: () => void;
+}) {
+  const gameMeta = useGameMeta();
+  const start = fields(initial?.startsAt ?? null);
+  const end = fields(initial?.endsAt ?? null);
+
+  const [game, setGame] = useState<LaneId>(
+    initial?.game ?? lanes[0] ?? Object.keys(customGames)[0] ?? "",
+  );
+  const [title, setTitle] = useState(initial?.title ?? "");
+  const [type, setType] = useState<EventType>(initial?.type ?? "other");
+  const [summary, setSummary] = useState(initial?.summary ?? "");
+  const [startDate, setStartDate] = useState(start.date);
+  const [startTime, setStartTime] = useState(
+    initial?.startPrecision === "exact" ? start.time : "",
+  );
+  // Separate from an empty end date so "I don't know" is a thing the reader
+  // states, not a field they leave blank and hope about.
+  const [endKnown, setEndKnown] = useState(initial ? initial.endsAt !== null : true);
+  const [endDate, setEndDate] = useState(end.date);
+  const [endTime, setEndTime] = useState(
+    initial?.endPrecision === "exact" ? end.time : "",
+  );
+
+  const startsAt = startDate === "" ? null : readerInstant(startDate, startTime, "start");
+  const endsAt =
+    !endKnown || endDate === "" ? null : readerInstant(endDate, endTime, "end");
+
+  const endMissing = endKnown && endDate !== "" && endsAt === null;
+  const backwards = startsAt !== null && endsAt !== null && endsAt <= startsAt;
+  const valid =
+    title.trim().length > 0 &&
+    game !== "" &&
+    startsAt !== null &&
+    !backwards &&
+    !endMissing &&
+    (!endKnown || endDate !== "");
+
+  return (
+    <form
+      className="mt-3 rounded-xl border border-hairline p-3"
+      onSubmit={(e) => {
+        e.preventDefault();
+        if (!valid || startsAt === null) return;
+        onSave({
+          game,
+          title,
+          type,
+          summary,
+          startsAt,
+          startHasTime: startTime !== "",
+          endsAt,
+          endHasTime: endTime !== "",
+        });
+      }}
+    >
+      <label className={labelClass()}>
+        Game
+        <select
+          value={game}
+          onChange={(e) => setGame(e.target.value)}
+          className={inputClass()}
+        >
+          {lanes.map((id) => (
+            <option key={id} value={id}>
+              {gameMeta(id).name}
+              {isCustomGameId(id) ? " (yours)" : ""}
+            </option>
+          ))}
+        </select>
+      </label>
+
+      <label className={`${labelClass()} mt-3`}>
+        What is it
+        <input
+          value={title}
+          maxLength={200}
+          onChange={(e) => setTitle(e.target.value)}
+          placeholder="Walpurgisnacht"
+          className={inputClass()}
+        />
+      </label>
+
+      <label className={`${labelClass()} mt-3`}>
+        Kind
+        <select
+          value={type}
+          onChange={(e) => setType(e.target.value as EventType)}
+          className={inputClass()}
+        >
+          {TYPES.map((t) => (
+            <option key={t} value={t}>
+              {t}
+            </option>
+          ))}
+        </select>
+      </label>
+
+      <div className="mt-3 grid grid-cols-2 gap-2">
+        <label className={labelClass()}>
+          Starts
+          <input
+            type="date"
+            value={startDate}
+            onChange={(e) => setStartDate(e.target.value)}
+            className={inputClass()}
+          />
+        </label>
+        <label className={labelClass()}>
+          Time (optional)
+          <input
+            type="time"
+            value={startTime}
+            onChange={(e) => setStartTime(e.target.value)}
+            className={inputClass()}
+          />
+        </label>
+      </div>
+
+      {/* The end is allowed to be unknown, and says so out loud. Making it
+          mandatory would push the reader into inventing a date, which is
+          exactly the failure the parsers are forbidden from committing. */}
+      <label className="mt-3 flex cursor-pointer select-none items-center gap-2 text-xs text-muted">
+        <input
+          type="checkbox"
+          checked={!endKnown}
+          onChange={(e) => setEndKnown(!e.target.checked)}
+          className="size-4 accent-[var(--color-near)]"
+        />
+        I don't know when it ends
+      </label>
+
+      {endKnown && (
+        <div className="mt-2 grid grid-cols-2 gap-2">
+          <label className={labelClass()}>
+            Ends
+            <input
+              type="date"
+              value={endDate}
+              onChange={(e) => setEndDate(e.target.value)}
+              className={inputClass()}
+            />
+          </label>
+          <label className={labelClass()}>
+            Time (optional)
+            <input
+              type="time"
+              value={endTime}
+              onChange={(e) => setEndTime(e.target.value)}
+              className={inputClass()}
+            />
+          </label>
+        </div>
+      )}
+
+      <label className={`${labelClass()} mt-3`}>
+        Note (optional)
+        <input
+          value={summary}
+          maxLength={500}
+          onChange={(e) => setSummary(e.target.value)}
+          placeholder="What you want to remember about it"
+          className={inputClass()}
+        />
+      </label>
+
+      {!endKnown && (
+        <p className="mt-2 text-xs leading-relaxed text-faint">
+          It'll show with no countdown and no daily checklist, the same as an
+          event whose source hasn't announced an end.
+        </p>
+      )}
+      {backwards && (
+        <p className="mt-2 text-xs text-critical">
+          That ends before it starts.
+        </p>
+      )}
+      {endMissing && (
+        <p className="mt-2 text-xs text-critical">That end date isn't a real date.</p>
+      )}
+      {startTime === "" && startDate !== "" && (
+        <p className="mt-2 text-xs leading-relaxed text-faint">
+          No time given, so this counts from the start of the day where you are —
+          and to the end of the day it finishes on.
+        </p>
+      )}
+
+      <div className="mt-4 flex gap-2">
+        <button
+          type="submit"
+          disabled={!valid}
+          className="rounded-lg border border-transparent bg-ink px-3 py-1.5 text-xs font-medium text-ground transition-colors disabled:opacity-40"
+        >
+          {initial === undefined ? "Add event" : "Save changes"}
+        </button>
+        <button
+          type="button"
+          onClick={onCancel}
+          className="rounded-lg border border-hairline px-3 py-1.5 text-xs text-muted transition-colors hover:text-ink"
+        >
+          Cancel
+        </button>
+      </div>
+    </form>
+  );
+}

src/client/components/EventDetail.tsx

@@ -1,5 +1,13 @@
-import { useEffect } from "react";
+import { useEffect, useState } from "react";
 import { useGameMeta } from "../state/gameMeta.tsx";
+import {
+  isCustomEventId,
+  type CustomEvent,
+  type CustomGames,
+  type LaneId,
+} from "../../shared/custom.ts";
+import type { EventDraft } from "../state/useCustom.ts";
+import { EventForm } from "./CustomForms.tsx";
 import { formatAbsolute, formatRemaining } from "../../shared/time.ts";
 import type { RowEvent } from "./EventRow.tsx";
 import { pressure, pressureReason, type Effort } from "../../shared/effort.ts";
@@ -29,6 +37,7 @@ export function EventDetail({
   onEffort,
   onNote,
   onClose,
+  own,
 }: {
   row: RowEvent;
   completed: boolean;
@@ -51,8 +60,23 @@ export function EventDetail({
   onEffort: (id: string, e: Effort | undefined) => void;
   onNote: (id: string, n: string) => void;
   onClose: () => void;
+  /**
+   * Present only when this is an event the reader entered themselves, in which
+   * case they can change it or take it back — this sheet is where anyone would
+   * look for that, rather than a list in settings.
+   */
+  own?:
+    | {
+        record: CustomEvent;
+        lanes: LaneId[];
+        games: CustomGames;
+        onSave: (id: string, draft: EventDraft) => void;
+        onDelete: (id: string) => void;
+      }
+    | undefined;
 }) {
   const gameMeta = useGameMeta();
+  const [editing, setEditing] = useState(false);
   const { event, clock } = row;
   const game = gameMeta(event.game);
   const heat = URGENCY_COLOR[clock.urgency];
@@ -86,6 +110,14 @@ export function EventDetail({
         <h2 className="mt-1.5 font-display text-xl font-semibold leading-snug">
           {event.title}
         </h2>
+        {/* Stated plainly, next to the title rather than buried at the bottom:
+            a reader has to be able to tell which dates the app went and found
+            and which ones they typed in themselves. */}
+        {isCustomEventId(event.id) && (
+          <p className="mt-1 text-xs text-faint">
+            You added this. The dates are yours, not a source's.
+          </p>
+        )}
         {event.summary !== null && (
           <p className="mt-2 text-sm leading-relaxed text-muted">{event.summary}</p>
         )}
@@ -190,6 +222,49 @@ export function EventDetail({
           onNote={(n) => onNote(event.id, n)}
         />
 
+        {own !== undefined && (
+          <div className="mt-4 border-t border-hairline pt-4">
+            {editing ? (
+              <EventForm
+                lanes={own.lanes}
+                customGames={own.games}
+                initial={own.record}
+                onSave={(draft) => {
+                  own.onSave(event.id, draft);
+                  setEditing(false);
+                }}
+                onCancel={() => setEditing(false)}
+              />
+            ) : (
+              <div className="flex gap-2">
+                <button
+                  type="button"
+                  onClick={() => setEditing(true)}
+                  className="rounded-lg border border-hairline px-3 py-1.5 text-xs text-muted transition-colors hover:text-ink"
+                >
+                  Edit this event
+                </button>
+                <button
+                  type="button"
+                  onClick={() => {
+                    own.onDelete(event.id);
+                    onClose();
+                  }}
+                  className="rounded-lg border border-hairline px-3 py-1.5 text-xs text-muted transition-colors hover:text-critical"
+                >
+                  Delete
+                </button>
+              </div>
+            )}
+            {/* Their marks and logged days are not swept up with it: reaching
+                into three other stores on one tap is how a misclick costs
+                somebody a streak. */}
+            <p className="mt-2 text-xs leading-relaxed text-faint">
+              Deleting removes the event. Anything you ticked off stays.
+            </p>
+          </div>
+        )}
+
         {event.endPrecision === "day" && event.endsAt !== null && (
           <p className="mt-3 text-xs leading-relaxed text-faint">
             The source gave a date but no time of day, so this end is accurate to

src/client/components/EventRow.tsx

@@ -1,4 +1,4 @@
-import type { DisplayEvent } from "../../shared/custom.ts";
+import { isCustomEventId, type DisplayEvent } from "../../shared/custom.ts";
 import { useGameMeta } from "../state/gameMeta.tsx";
 import {
   formatRemaining,
@@ -88,6 +88,13 @@ export function EventRow({
             <div className="min-w-0">
               <span className="eyebrow flex items-center gap-1.5 truncate">
                 <span style={{ color: game.hue }}>{game.short}</span>
+                {/* A date the reader typed is never allowed to look like one
+                    a source published. */}
+                {isCustomEventId(event.id) && (
+                  <span className="rounded-[3px] border border-hairline px-1 py-px text-[0.5625rem] tracking-normal text-faint">
+                    yours
+                  </span>
+                )}
                 {ignored && (
                   <span className="rounded-[3px] bg-hairline px-1 py-px text-[0.5625rem] tracking-normal text-muted">
                     ignored

src/client/components/YourOwn.tsx

@@ -0,0 +1,162 @@
+import { useState } from "react";
+import type { CustomEvents, CustomGames, LaneId } from "../../shared/custom.ts";
+import { useGameMeta } from "../state/gameMeta.tsx";
+import type { EventDraft } from "../state/useCustom.ts";
+import { EventForm, GameForm } from "./CustomForms.tsx";
+
+/**
+ * The reader's own games and events, in the settings panel (PRD F13).
+ *
+ * Their events are managed from the event itself — open it and the detail sheet
+ * offers edit and delete, exactly where you would look for them. What has no
+ * other home is the list of games they invented, and the way in to adding the
+ * first event, so both live here.
+ */
+export function YourOwn({
+  games,
+  events,
+  lanes,
+  onAddGame,
+  onEditGame,
+  onRemoveGame,
+  onAddEvent,
+}: {
+  games: CustomGames;
+  events: CustomEvents;
+  /** Every lane an event may be filed under, tracked games included. */
+  lanes: LaneId[];
+  onAddGame: (name: string, hue: string) => void;
+  onEditGame: (id: string, name: string, hue: string) => void;
+  onRemoveGame: (id: string) => { removed: boolean; blockedBy: number };
+  onAddEvent: (draft: EventDraft) => void;
+}) {
+  const gameMeta = useGameMeta();
+  const [adding, setAdding] = useState<"game" | "event" | null>(null);
+  const [editing, setEditing] = useState<string | null>(null);
+  const [refusal, setRefusal] = useState<string | null>(null);
+
+  const list = Object.values(games);
+
+  return (
+    <div className="mt-6 border-t border-hairline pt-4">
+      <p className="eyebrow">Your own games and events</p>
+      <p className="mt-1.5 max-w-md text-xs leading-relaxed text-faint">
+        Track something this app doesn't cover, or an event a source missed. Your
+        dates are yours — they're never presented as coming from a wiki, and they
+        travel in your export.
+      </p>
+
+      {list.length > 0 && (
+        <ul className="mt-3 flex flex-col gap-1.5">
+          {list.map((game) => {
+            const held = Object.values(events).filter(
+              (e) => e.game === game.id,
+            ).length;
+            return (
+              <li key={game.id}>
+                <div className="flex items-center gap-2">
+                  <span
+                    aria-hidden
+                    className="size-2.5 shrink-0 rounded-full"
+                    style={{ background: game.hue }}
+                  />
+                  <span className="min-w-0 flex-1 truncate text-sm">{game.name}</span>
+                  <span className="shrink-0 text-xs text-faint">
+                    {held === 0
+                      ? "no events yet"
+                      : `${held} event${held > 1 ? "s" : ""}`}
+                  </span>
+                  <button
+                    type="button"
+                    onClick={() => {
+                      setEditing(editing === game.id ? null : game.id);
+                      setRefusal(null);
+                    }}
+                    className="shrink-0 text-xs text-faint transition-colors hover:text-ink"
+                  >
+                    Edit
+                  </button>
+                  <button
+                    type="button"
+                    onClick={() => {
+                      const result = onRemoveGame(game.id);
+                      // Refused rather than cascading: deleting a lane should
+                      // not quietly take a fortnight of events with it.
+                      setRefusal(
+                        result.removed
+                          ? null
+                          : `${game.name} still has ${result.blockedBy} event${
+                              result.blockedBy > 1 ? "s" : ""
+                            }. Delete those first.`,
+                      );
+                    }}
+                    className="shrink-0 text-xs text-faint transition-colors hover:text-critical"
+                  >
+                    Delete
+                  </button>
+                </div>
+
+                {editing === game.id && (
+                  <GameForm
+                    initial={{ name: game.name, hue: game.hue }}
+                    onSave={(name, hue) => {
+                      onEditGame(game.id, name, hue);
+                      setEditing(null);
+                    }}
+                    onCancel={() => setEditing(null)}
+                  />
+                )}
+              </li>
+            );
+          })}
+        </ul>
+      )}
+
+      {refusal !== null && (
+        <p className="mt-2 text-xs leading-relaxed text-critical">{refusal}</p>
+      )}
+
+      {adding === "game" && (
+        <GameForm
+          onSave={(name, hue) => {
+            onAddGame(name, hue);
+            setAdding(null);
+          }}
+          onCancel={() => setAdding(null)}
+        />
+      )}
+
+      {adding === "event" && (
+        <EventForm
+          lanes={lanes}
+          customGames={games}
+          onSave={(draft) => {
+            onAddEvent(draft);
+            setAdding(null);
+          }}
+          onCancel={() => setAdding(null)}
+        />
+      )}
+
+      {adding === null && (
+        <div className="mt-3 flex gap-2">
+          <button
+            type="button"
+            onClick={() => setAdding("game")}
+            className="rounded-lg border border-hairline px-3 py-1.5 text-xs text-muted transition-colors hover:text-ink"
+          >
+            Add a game
+          </button>
+          <button
+            type="button"
+            onClick={() => setAdding("event")}
+            disabled={lanes.length === 0}
+            className="rounded-lg border border-hairline px-3 py-1.5 text-xs text-muted transition-colors hover:text-ink disabled:opacity-40"
+          >
+            Add an event
+          </button>
+        </div>
+      )}
+    </div>
+  );
+}

test/custom-ui.test.tsx

@@ -0,0 +1,141 @@
+import { describe, expect, test } from "bun:test";
+import { renderToStaticMarkup } from "react-dom/server";
+import { EventForm } from "../src/client/components/CustomForms.tsx";
+import { YourOwn } from "../src/client/components/YourOwn.tsx";
+import { EventRow } from "../src/client/components/EventRow.tsx";
+import { GameMetaProvider } from "../src/client/state/gameMeta.tsx";
+import {
+  asDisplayEvent,
+  CustomEvent,
+  type CustomEvents,
+  type CustomGames,
+} from "../src/shared/custom.ts";
+import { metaFor } from "../src/shared/games.ts";
+import { clockFor } from "../src/shared/time.ts";
+
+/**
+ * Static-render checks on the F13 surfaces.
+ *
+ * Not a substitute for using the thing, but they pin the two claims the feature
+ * makes to a reader: their event is marked as theirs, and the end date is
+ * allowed to be unknown.
+ */
+
+const AT = "2026-08-17T12:00:00.000Z";
+
+const GAMES: CustomGames = {
+  "mygame:limbus-company": {
+    id: "mygame:limbus-company",
+    name: "Limbus Company",
+    hue: "#C74B50",
+    at: AT,
+  },
+};
+
+const OWN = CustomEvent.parse({
+  id: "myevent:k3f9qa2m01",
+  game: "mygame:limbus-company",
+  title: "Walpurgisnacht",
+  type: "banner",
+  summary: null,
+  startsAt: "2026-08-20T00:00:00.000Z",
+  startPrecision: "day",
+  endsAt: "2026-09-03T00:00:00.000Z",
+  endPrecision: "day",
+  at: AT,
+  updatedAt: AT,
+});
+
+const EVENTS: CustomEvents = { [OWN.id]: OWN };
+
+function render(node: React.ReactElement): string {
+  return renderToStaticMarkup(
+    <GameMetaProvider value={(id) => metaFor(id, GAMES)}>{node}</GameMetaProvider>,
+  );
+}
+
+describe("YourOwn", () => {
+  const noop = () => {};
+  const props = {
+    games: GAMES,
+    events: EVENTS,
+    lanes: ["genshin", "mygame:limbus-company"],
+    onAddGame: noop,
+    onEditGame: noop,
+    onRemoveGame: () => ({ removed: true, blockedBy: 0 }),
+    onAddEvent: noop,
+  };
+
+  test("lists a reader's game with the events it holds", () => {
+    const html = render(<YourOwn {...props} />);
+    expect(html).toContain("Limbus Company");
+    expect(html).toContain("1 event");
+    expect(html).toContain("#C74B50");
+  });
+
+  test("shows a game with nothing in it rather than hiding it", () => {
+    // A game they just made has to appear before it holds anything, or adding
+    // one looks like it did nothing.
+    const html = render(<YourOwn {...props} events={{}} />);
+    expect(html).toContain("no events yet");
+  });
+});
+
+describe("EventForm", () => {
+  test("offers an unknown end rather than demanding a date", () => {
+    // The whole point: a form that made the end mandatory would push the reader
+    // into inventing one, which is the failure the parsers are forbidden from.
+    const html = render(
+      <EventForm
+        lanes={["genshin", "mygame:limbus-company"]}
+        customGames={GAMES}
+        onSave={() => {}}
+        onCancel={() => {}}
+      />,
+    );
+    expect(html).toContain("I don&#x27;t know when it ends");
+  });
+
+  test("lets an event be filed under a tracked game too", () => {
+    // A source can miss an event in a game we do cover.
+    const html = render(
+      <EventForm
+        lanes={["genshin", "mygame:limbus-company"]}
+        customGames={GAMES}
+        onSave={() => {}}
+        onCancel={() => {}}
+      />,
+    );
+    expect(html).toContain("Genshin Impact");
+    expect(html).toContain("Limbus Company (yours)");
+  });
+});
+
+describe("EventRow provenance", () => {
+  const row = (id: string) => {
+    const event = { ...asDisplayEvent(OWN), id };
+    return { event, clock: clockFor(event, "europe", Date.parse(AT)) };
+  };
+
+  test("marks the reader's own event as theirs", () => {
+    const html = render(
+      <ul>
+        <EventRow row={row(OWN.id)} completed={false} onOpen={() => {}} />
+      </ul>,
+    );
+    expect(html).toContain("yours");
+  });
+
+  test("does not mark a scraped event as theirs", () => {
+    const html = render(
+      <ul>
+        <EventRow
+          row={row("genshin:windblume-festival:2026-03-14")}
+          completed={false}
+          onOpen={() => {}}
+        />
+      </ul>,
+    );
+    expect(html).not.toContain(">yours<");
+  });
+});