refactor(ui): make an event row a single open target

The row already opened the event; the tick sat on top of it, so the two
smallest targets on the page did different things a few pixels apart.
"Done" was never the only thing a reader wants to say about an event
either — status, effort and notes all live in the detail sheet.

The tick becomes a chevron: decorative, aria-hidden, and leaning towards
where the row is about to take you on hover. The full-bleed button is
the only control, so there is no second stop for anyone tabbing or using
a screen reader. Undo on a revealed ignored row stays a real button —
it is a real action with nowhere better to sit.

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

src/client/App.tsx

@@ -228,7 +228,6 @@ export function App() {
                   status={prog.progress[row.event.id]?.status}
                   effort={prog.progress[row.event.id]?.effort}
                   ignored={ignored.marks[row.event.id] !== undefined}
-                  onToggle={toggle}
                   onRestore={(id) => ignored.toggle(id)}
                   onOpen={setOpenId}
                 />
@@ -246,7 +245,6 @@ export function App() {
                   status={prog.progress[row.event.id]?.status}
                   effort={prog.progress[row.event.id]?.effort}
                   ignored={ignored.marks[row.event.id] !== undefined}
-                  onToggle={toggle}
                   onRestore={(id) => ignored.toggle(id)}
                   onOpen={setOpenId}
                 />