feat(desktop): Excelセルのインラインdiff表示

[MocA-Love]

Summary

• Excelの差分表示で、変更されたセル内のテキストの具体的な変更箇所をインラインでハイライト表示
• 追加部分は緑背景、削除部分は赤背景+取り消し線で表示
• diff (jsdiff) ライブラリを使用した文字レベルのdiff計算

Changes

• useSpreadsheetDiff.ts: DiffSegment 型追加、diffChars による文字レベルdiff計算
• SpreadsheetDiffViewer.tsx: InlineDiffContent コンポーネント追加、セル内インラインdiff描画
• package.json: diff パッケージ追加

Test plan

• Excelファイルのセル内テキストを変更し、diff表示で変更箇所がインラインでハイライトされることを確認
• 追加テキストが緑背景で表示されることを確認
• 削除テキストが赤背景+取り消し線で表示されることを確認
• セル追加/削除（added/removed）の既存表示が壊れていないことを確認
• 複数シートのdiff表示が正常に動作することを確認

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 7b0125ad-85f1-4c18-b2b0-1f6983d3303d

📥 Commits

Reviewing files that changed from the base of the PR and between d16c67c and 8aa5e4f.

⛔ Files ignored due to path filters (1)

• bun.lock is excluded by !**/*.lock

📒 Files selected for processing (17)

• README.md
• apps/desktop/package.json
• apps/desktop/src/lib/trpc/routers/extensions/index.ts
• apps/desktop/src/lib/trpc/routers/index.ts
• apps/desktop/src/main/index.ts
• apps/desktop/src/main/lib/extensions/compatibility-checker.ts
• apps/desktop/src/main/lib/extensions/crx-downloader.ts
• apps/desktop/src/main/lib/extensions/extension-manager.ts
• apps/desktop/src/renderer/routes/_authenticated/settings/components/SettingsSidebar/GeneralSettings.tsx
• apps/desktop/src/renderer/routes/_authenticated/settings/extensions/components/ExtensionsSettings/ExtensionsSettings.tsx
• apps/desktop/src/renderer/routes/_authenticated/settings/extensions/components/ExtensionsSettings/index.ts
• apps/desktop/src/renderer/routes/_authenticated/settings/extensions/page.tsx
• apps/desktop/src/renderer/routes/_authenticated/settings/layout.tsx
• apps/desktop/src/renderer/routes/_authenticated/settings/utils/settings-search/settings-search.ts
• apps/desktop/src/renderer/screens/main/components/WorkspaceView/ContentView/TabsContent/TabView/FileViewerPane/components/SpreadsheetViewer/SpreadsheetDiffViewer.tsx
• apps/desktop/src/renderer/screens/main/components/WorkspaceView/ContentView/TabsContent/TabView/FileViewerPane/components/SpreadsheetViewer/useSpreadsheetDiff.ts
• apps/desktop/src/renderer/stores/settings-state.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/desktop-excel-inline-diff

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