Fix Codex weekly window detection

[anthfgreco]

Fixes #267

Summary

• Identify Codex session and weekly usage windows from duration/reset metadata instead of array position.
• Preserve an absent 5-hour session as an informational unavailable lane.
• Calculate provider pace from the weekly quota when no session window is present.
• Mark the unavailable session consistently in the tray status, Settings usage section, and CLI output.

Root cause

Codex weekly-only payloads were promoted into the primary window, while array payloads assumed the first window was always the 5-hour session. That mislabeled weekly usage and left the weekly and pace lanes incorrect.

Validation

• cargo fmt --all
• git diff --check
• cargo test --manifest-path rust/Cargo.toml codex
• cargo test --manifest-path apps/desktop-tauri/src-tauri/Cargo.toml commands::bridge
• cargo clippy --manifest-path rust/Cargo.toml --all-targets -- -D warnings
• cargo clippy --manifest-path apps/desktop-tauri/src-tauri/Cargo.toml --all-targets -- -D warnings
• Frontend Vitest was unavailable because apps/desktop-tauri/node_modules is not installed.
• Cua proof was skipped per the requested config-only scope.

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[Finesssee]

Thanks for the PR, I will review it ASAP.

[Finesssee]

Request changes (narrow, one structural blocker)

Blocking: rust/src/providers/codex/api.rs:587-596 (no_session_primary()) is a behavioral duplicate of rust/src/providers/claude/web_api.rs:652-661 (synthetic_no_session_primary()). Both construct the identical informational 5-hour "No active session" RateWindow: 0.0%, window_minutes: Some(300), the same "No active 5h session" description, is_informational = true.

With this PR there are now two independent copies of one cross-provider invariant ("the shared 5h-session lane is absent"). The next time the wording, minutes, or placeholder shape changes for one provider, the other silently diverges — and every downstream surface (tray label, Settings usage bar, CLI line, hooks, forecasts) keys off this exact contract.

Remedy: add a canonical constructor in rust/src/core/rate_window.rs, e.g. RateWindow::no_active_session(), using the existing SESSION_WINDOW_MINUTES constant, and call it from both providers. Codex's version is the better one to promote — it already uses SESSION_WINDOW_MINUTES where Claude's uses the literal 300, so promoting it fixes both.

Everything else in the normalization design looks strong: the fix reuses the canonical is_informational contract that guard/hooks/forecast/tray consumers already honor, deletes the duplicated typed-response parsing path, and hardens the integer boundaries (u32::try_from, json_i64). Verified locally in a read-only worktree at 2cbb67d: cargo test -p codexbar codex → 79 passed, commands::bridge → 5 passed. This is intentionally a narrow request — land the shared constructor and this is an approve.

[Finesssee]

Approve

The blocking duplication is resolved: RateWindow::no_active_session() in rust/src/core/rate_window.rs is now the single canonical constructor (built on RateWindow::informational("No active 5h session") plus SESSION_WINDOW_MINUTES), and both provider-local copies — Codex no_session_primary() and Claude synthetic_no_session_primary() — are deleted with all call sites migrated. Field-for-field behavior is identical (0.0%, 5h window, same description, informational), confirmed by the unchanged provider tests.

Validation basis (accurate, exact head 5540635): this repository has no GitHub required checks configured on main (no branch protection, no required status checks), so approval rests on local validation run against this exact head:

• vitest run src/surfaces/settings/providers/sections/UsageSection.test.tsx (pnpm 10.18.1, vitest 3.2.4): 2/2 passed — includes the new informational-unavailable-lane test
• Full frontend suite pnpm run test: 37 files / 228 tests passed
• cargo test rate_window: 6 passed (new core test covers informational=true, minutes=300, description, 0%, no reset)
• cargo test codex: 79 passed · claude: 77 passed · commands::bridge: 5 passed
• cargo fmt clean; cargo clippy --all-targets -- -D warnings clean on both the rust and src-tauri crates