Fix response detection and add notebook title sync

[ajagjivan-celonis]

Summary

• Fix stale/cached responses being returned instead of actual answers
• Add automatic notebook title sync from NotebookLM UI to local library
• Improve typing resilience against DOM re-renders

Problem 1: Stale Responses

The ask_question.py script was returning cached responses from chat history instead of the actual answer. NotebookLM's DOM inserts new responses at arbitrary positions (not always at the end), and the original code captured baselines before async history loaded.

Problem 2: Notebook Names Out of Sync

Local library.json stored names at add-time but never updated them when users renamed notebooks in NotebookLM's web UI.

Solution

• Resilient typing: Replace element.type() with page.fill() to prevent DOM detachment errors during React re-renders
• Hash-based detection: Capture hashes of all existing responses before submitting, then identify new responses by checking which element's hash isn't in the baseline set
• Title sync: Extract notebook name from page.title() and auto-update library.json when names differ

Test plan

• Simple math questions return correct fresh answers
• Complex multi-part queries work correctly
• New notebooks auto-detect title on add
• Title sync triggers when names differ

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