fix: count footer words from BlockNote text, not JSON

[daschinmoy21]

Summary

• Add countWordsInNoteContent that extracts text from BlockNote JSON
• App uses it for footer word count instead of splitting raw JSON

Fixes #38

Test plan

• unit tests for BlockNote docs vs naive JSON split
• tsc --noEmit

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 264aa83d-8af7-433d-a2d0-b14632de6c4c

📥 Commits

Reviewing files that changed from the base of the PR and between a3b158b and 128517d.

📒 Files selected for processing (3)

• src/App.tsx
• src/lib/note-utils.test.ts
• src/lib/note-utils.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/word-count-blocknote

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