✨ Quality: improve useAISummarize documentation and test coverage

[galiprandi]

This PR improves the code quality of the useAISummarize hook by adding detailed JSDoc documentation and a new test suite that targets previously uncovered branches.

💡 What:

• Added JSDoc with descriptions and @example blocks to UseAISummarizeReturn interface and useAISummarize hook.
• Created lib/hooks/useAISummarize.coverage.test.ts to cover security checks (base constructors), explicit language options, context handling, and error recovery paths (warmup failures, missing user activation).
• Synchronized useAISummarize.ts with the project's .prettierrc.json (4 spaces, no semicolons).

🎯 Why:

• The hook was previously missing detailed documentation for its public API.
• Several edge cases and security checks in the implementation were untested.
• Maintaining consistent formatting improves codebase health.

📊 Impact:

• Increased useAISummarize.ts line coverage to over 91%.
• Improved developer experience through better IDE IntelliSense and usage examples.
• Strengthened code robustness by verifying security and error-handling logic.

✅ Verification:

• Ran pnpm test:coverage to verify all tests pass and coverage is improved.
• Ran pnpm lint to ensure code quality.
• Ran npx prettier --write to verify formatting.

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PR created automatically by Jules for task 7727297094533240166 started by @galiprandi

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[galiprandi]

Closing in favor of #100 (merged). #100 adds the same JSDoc + coverage with a minimal diff. The full prettier reformat of useAISummarize.ts included here is better done in a single consistent pass across all hooks (useAIRewriter, useAIWrite, useLanguageDetection still use 2-space/semicolons) rather than file-by-file. Thanks for the contribution.

[google-labs-jules]

Closing in favor of #100 (merged). #100 adds the same JSDoc + coverage with a minimal diff. The full prettier reformat of useAISummarize.ts included here is better done in a single consistent pass across all hooks (useAIRewriter, useAIWrite, useLanguageDetection still use 2-space/semicolons) rather than file-by-file. Thanks for the contribution.

Understood. Acknowledging that this work is now obsolete as it has been addressed in #100, and stopping work on this task. Thank you for the feedback regarding the consistent formatting pass.