Port applicable OpenUsage 0.7.14 provider fixes to Windows/Tauri

[poweruserz]

Summary

Compare the v0.7.3 fork with upstream OpenUsage v0.7.13 → v0.7.14 and adapt applicable provider fixes to the existing plugin architecture.

• Codex: bind local spend/history to the selected auth file's home, including ~/.config/codex; cover independent Windows account token rotation while preserving the default login.
• Codex: retain one history worker per home across probes with a 150 ms caller wait. Scope retained results by account identity and query dates so slow history does not block live quota.
• Codex: map prolite, pro, and promax to Pro 100, Pro 200, and Pro 500.
• Cursor: use valid structured team model pools and the reported total percentage, omit absent totals, and retain legacy fallbacks for incomplete/invalid pools or zero placeholders beside positive spend.
• OpenCode: preserve active session reset countdowns below 1% usage; suppress only untouched rolling-window placeholders using capture time/HTTP Date, while keeping weekly/monthly resets.
• Add provider and native-host regression coverage, update provider/API documentation and changelog, and enable pre-PR CI on port/** plus Windows Rust tests.

Scope and exclusions

The fork already supports file-backed token refresh and its own issue-reporting link; existing behavior is documented and covered rather than replacing it with upstream Swift implementations. Excludes macOS panel anchoring/navigation, Swift header layout, and PostHog changes. Plugin identities, metric labels, translations, logos, and UI layout are unchanged. WSL history remains disabled.

Full comparison and adaptation decisions: upstream 0.7.14 port notes.

Validation

Push CI passed for exact head de8bb0d24feb10f02cb2447f1f925f12312ee85a before this PR was opened:

• Ubuntu: frozen dependency install, bun run build (TypeScript check + Vite build), and full Vitest suite.
• Windows: frozen dependency install, plugin bundling, frontend build, and cargo test --locked --manifest-path src-tauri/Cargo.toml --lib.
• Regression coverage includes account/home isolation, token rotation, Codex plan identifiers, pending/retained history and scope invalidation, Cursor pool fallbacks, OpenCode resets, and nested credential redaction.

The existing frontend job is named “Lint, Type-check, Build, Test”, but its workflow has no separate lint command. CI validates builds and automated tests; it does not establish a manual live-provider or packaged Windows UI smoke test.

At creation, the branch is 2 commits ahead of main and 0 behind. This PR is left in draft for review.