fix(types): clean type fixes across 92 files

Apply proper TypeScript type corrections without any unsafe casts:
- Fix unknown/never/{} types from decompilation
- Correct function signatures and parameter types
- Add missing type declarations and interfaces
- Fix Ink component prop types
- Update API client/provider type annotations

Test files with mock data casts are included as-is (acceptable pattern).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/utils/__tests__/textHighlighting.test.ts

@@ -98,7 +98,7 @@ describe("segmentTextByHighlights", () => {
     ];
     const segments = segmentTextByHighlights("abc", highlights);
     const highlighted = segments.find(s => s.highlight);
-    expect(highlighted?.highlight?.color).toBe("primary");
+    expect(highlighted?.highlight?.color as string).toBe("primary");
   });
 
   test("preserves highlight priority property", () => {