Add frontend coverage: vitest --coverage uploaded as its own Codecov flag

[DianaSensei]

Summary

coverage.yml only ever measured the Rust backend (src-tauri) — the frontend's vitest.config.ts already had a coverage block and @vitest/coverage-v8 installed, but nothing in CI ran it, so the Codecov App had no frontend data to report on at all. It only displays what gets uploaded to it; it doesn't generate coverage itself.

• New frontend job in coverage.yml: Node-only (no Tauri/Rust setup), runs npm run test:coverage (already an existing script) and uploads coverage/lcov.info under the frontend flag.
• Renamed the existing job to rust and tagged its upload with the rust flag, so the two languages report as separate components instead of one number that mixes their very different testability.
• codecov.yml: declared both flags with carryforward (a docs/scripts-only change skips both jobs via coverage.yml's paths-ignore, so a flag with no fresh upload should keep its last known number, not show as dropping to 0%), and fixed the file's own comments, which described Rust-only coverage.

Test plan

• npm run test:coverage — runs clean locally, produces coverage/lcov.info
• Both workflow YAML files parse (yaml.safe_load)

🤖 Generated with Claude Code

https://claude.ai/code/session_01BCypCuViyQDKGWxWspXKs2

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Generated by Claude Code

[pullfrog]

• Checkout PR Add frontend coverage: vitest --coverage uploaded as its own Codecov flag #150 and read the full diff
• Read PR summary snapshot and repo learnings
• Triage: understand coverage config, CI workflows, codecov flags
• Dispatch specialists for unresolved questions
• Aggregate findings and draft review
• Submit review via create_pull_request_review
• Update PR summary snapshot file

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 42.03%. Comparing base (ef21099) to head (8cf59d0).
⚠️ Report is 1 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (ef21099) and HEAD (8cf59d0). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (ef21099)	HEAD (8cf59d0)
	1	0

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #150       +/-   ##
===========================================
- Coverage   65.49%   42.03%   -23.46%     
===========================================
  Files          13      299      +286     
  Lines        3428    19848    +16420     
  Branches        0     4904     +4904     
===========================================
+ Hits         2245     8343     +6098     
- Misses       1183    10508     +9325     
- Partials        0      997      +997     

Flag	Coverage Δ
frontend	37.14% <ø> (?)
rust	65.43% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.
see 287 files with indirect coverage changes

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