feat: add remove blank pages tool with sensitivity control

Implement new tool to detect and remove blank pages from PDFs with configurable sensitivity. Includes UI with preview functionality and comprehensive tests.

src/tests/pdf-tools.test.ts

@@ -16,7 +16,7 @@ describe('Tool Configuration Arrays', () => {
 
     it('should have the correct number of tools', () => {
       // This acts as a snapshot test to catch unexpected additions/removals.
-      expect(singlePdfLoadTools).toHaveLength(38);
+      expect(singlePdfLoadTools).toHaveLength(39);
     });
 
     it('should not contain any duplicate tools', () => {