feat: cursor usage meter

[Rtas-17]

Summary

Adds a Cursor usage meter next to Claude Code, Codex, and Antigravity.

Cursor already keeps the signed-in JWT in its local state.vscdb, and cursor.com/api/usage-summary returns JSON with Auto / API percentages for the current billing cycle. So this is a straight SQLite read + HTTP call — no HTML scraping, no separate login helper.

How auth works

1. Read cursorAuth/accessToken from %APPDATA%\Cursor\User\globalStorage\state.vscdb (read-only; copies to a temp file if Cursor has the DB locked).
2. Decode the JWT sub, take the id after the last |, and build WorkosCursorSessionToken=<id>%3A%3A<jwt>.
3. Optional override: set CURSOR_SESSION_TOKEN to the raw cookie value or JWT if the IDE DB isn't available.

If there's no token the Cursor bar shows ! until you sign in to Cursor (or set the env var).

What this PR adds

• src/models.rs: optional cursor field on AppUsageData
• src/poller.rs: poll_cursor() / cookie helpers / fetch_cursor_usage() mapping autoPercentUsed → session bar and apiPercentUsed → weekly bar, with billingCycleEnd as the shared reset. Unit test for the mapping included.
• src/window.rs: widget bar, Models → Cursor toggle, tray tooltip uses Auto/API wording. When Cursor is the only model enabled, row labels switch from 5h/7d to Auto/API — Cursor has a monthly pool, not a rolling 5-hour window.
• src/localization/*: cursor_model, cursor_window_title, cursor_auto_window, cursor_api_window
• Cargo.toml: rusqlite with the bundled feature so we can read the state DB without a system SQLite install

Test plan

• cargo test passes (verified locally, including cursor_usage_maps_auto_and_api_percentages)
• cargo build --release clean
• Live: Models → Cursor shows/hides the bar and persists across restarts
• Live: with Cursor signed in, Auto/API percentages match https://cursor.com/dashboard
• Live: Cursor-only mode shows Auto/API labels instead of 5h/7d; mixed with Claude keeps 5h/7d

I checked this on Windows 11 against a Pro account — usage-summary returned Auto ~1%, API 0%, reset at billingCycleEnd.

Design notes

• Cursor's plan is monthly included usage (Auto + API). There is no Claude-style 5-hour window in the API response, so both bars share billingCycleEnd.
• Token is read from disk on each poll and never stored by this app. Requests go only to cursor.com over HTTPS.
• Default build gains rusqlite (bundled). No webview / wry / tao.

What's not in this PR

• Ollama Cloud meter — already open as feat: ollama cloud usage meter #67
• MiniMax / Hermes auth.json path — personal-fork only (depends on Hermes layout)
• Fable weekly-scoped Claude bar — already covered by Add Fable 5 weekly usage meter for Claude Code #49

Risks

• Cursor changes the usage-summary shape — mitigated by optional fields + a unit test on the known response. Failures show ! rather than fake zeros.
• state.vscdb locked while Cursor is open — we open read-only and fall back to a temp copy if needed.

Happy to tweak the Auto/API labeling or split anything out if you'd rather review differently.

[Copilot]

Pull request overview

Adds a new “Cursor” provider to the usage monitor, including polling Cursor’s usage-summary API using a session token sourced from the Cursor IDE’s local state DB (or an env var override), plus UI/toggle/localization updates to render the new meter.

Changes:

• Extend the core usage model to include optional Cursor usage data.
• Implement Cursor polling: read session token (env var or state.vscdb), call https://cursor.com/api/usage-summary, and map Auto/API percentages into the existing session/weekly bars.
• Update the Windows UI/tray + settings + localization to add a Cursor toggle and display Auto/API labeling when Cursor is the only active model.

Reviewed changes

Copilot reviewed 16 out of 17 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/window.rs	Adds Cursor state fields, toggle plumbing, tray tooltip/icon entries, and bar rendering (including Cursor-only Auto/API labels).
src/poller.rs	Adds Cursor poller: token resolution from env/SQLite, usage-summary HTTP fetch, and response mapping + unit test.
src/models.rs	Adds AppUsageData.cursor: Option<UsageData> for Cursor usage.
src/localization/mod.rs	Extends Strings with Cursor labels/titles (model name + Auto/API window labels + window title).
src/localization/english.rs	Adds Cursor strings in English.
src/localization/dutch.rs	Adds Cursor strings in Dutch.
src/localization/spanish.rs	Adds Cursor strings in Spanish.
src/localization/french.rs	Adds Cursor strings in French.
src/localization/german.rs	Adds Cursor strings in German.
src/localization/japanese.rs	Adds Cursor strings in Japanese.
src/localization/korean.rs	Adds Cursor strings in Korean.
src/localization/traditional_chinese.rs	Adds Cursor strings in Traditional Chinese.
src/localization/simplified_chinese.rs	Adds Cursor strings in Simplified Chinese.
src/localization/russian.rs	Adds Cursor strings in Russian.
src/localization/portuguese_brazil.rs	Adds Cursor strings in Portuguese (Brazil).
Cargo.toml	Adds rusqlite (bundled) dependency for reading Cursor’s local state DB.
Cargo.lock	Locks new dependency graph for rusqlite/sqlite.

Comments suppressed due to low confidence (1)

src/window.rs:500

• In the loading/error tray-icon state, Cursor is also assigned TrayIconKind::Codex, so hovering is the only way to distinguish it from Codex. If Cursor is meant to have its own tray indicator, it should use a dedicated icon kind.

            if s.show_cursor {
                icons.push(tray_icon::TrayIconData {
                    kind: tray_icon::TrayIconKind::Codex,
                    percent: None,
                    tooltip: s.language.strings().cursor_window_title.to_string(),
                });

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