feat: persist last open note and add currency pills

[VariableThe]

Summary by CodeRabbit

• New Features

  • Enhanced editor now recognizes and highlights currency values with distinct visual styling for better readability
  • App now remembers and automatically restores the last opened note when you return

• Style

  • Added teal-themed visual styling for currency value formatting

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d24b3c7c-2be7-4be9-9e21-0dfbaf2ef598

📥 Commits

Reviewing files that changed from the base of the PR and between e0524df and 65084de.

📒 Files selected for processing (2)

• src/App.css
• src/App.tsx

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📝 Walkthrough

Walkthrough

Two features are added to App.tsx and App.css: a currency value decoration pass in the CodeMirror editor that regex-matches common currency formats and applies teal pill/highlight styles, and localStorage-based persistence that saves and restores the last-opened note's id across sessions.

Changes

Currency Highlighting and Note Persistence

Layer / File(s)	Summary
Currency decoration: regex pass and CSS styles src/App.tsx, src/App.css	A new "Currency Formats" pass in the decoration builder regex-matches currency strings (common symbols + numeric formats) and applies cm-currency-pill or cm-currency-highlight based on cursor overlap. Two matching teal-themed CSS selectors define pill border/color and highlight background.
Last-opened note persistence src/App.tsx	A useEffect writes the active note's id to localStorage key papercache-last-open-note on currentNoteIndex changes. The initial notes-loading flow reads that key and sets currentNoteIndex to the matching note index when found.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐇 Hop, hop — I found a coin!
A teal little pill where dollars join,
And when I close my burrow door,
My last-read note waits as before.
The carrot stays where I left it, hooray!
No searching through the warren today. 🥕

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately captures both main changes: persisting the last open note and adding currency pill styling for visual highlighting.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/currency-and-open-note

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