feat(cc-config,lanes): per-profile quota, and three fixes that made a write look lost

Closes #19, #20, #21, #27.

#19 — a saved auth profile now reports how much of its account's quota is
already spent, which is the only number that decides which one is worth
switching to. Nothing under CLAUDE_HOME records it, so it comes from the same
endpoint the CLI's own /usage reads, answered for whichever account's OAuth
token is presented. It is a POST and a button, never a poll: every profile that
is not the active one is normally expired, so answering means refreshing it
first, and a refresh ROTATES the stored refresh token. The rotated pair is
written straight back — dropping it would leave the profile holding a
credential Anthropic has already retired, i.e. an account needing a fresh
login. The token is read, put in an Authorization header, and never returned,
logged or echoed; what leaves the server is two percentages and two reset
times.

#20 — a settings patch that changes nothing wrote nothing but still took a
timestamped backup, so opening the config panel quietly grew a backup
directory inside every lane. patchSettings now compares the rendered output
with what is already on disk and returns early, fixed once where all callers
route through. A lane's git exclude also picks up .claude/.cc-config-backups/
beside settings.local.json.

#21 — the router apply route was the only mutating lane route that never
broadcast its lane. The write reached disk and the column, but the client's
cached row kept the old router_profile forever: the picker looked right until
the user switched lanes and back, at which point the effect re-read the stale
row and flipped the selection to the previous profile. One broadcastLane, plus
a lane-switch guard so an apply that resolves after the user has moved on no
longer paints its result onto whichever lane is now on screen.

#27 — Add-lane in worktree mode left the dialog up after a clean setup with a
dead confirm button and no obvious way out. It closes itself when nothing
failed, and when something did, the summary stays and the confirm becomes a
real Close.

CLAUDE.md

@@ -1,6 +1,6 @@
 # Claude Code Working Guide
 
-_Last synced: v1.6.8 (2026-09-17) + a run being opened by a DECLARATION only — a backwards DETECTION now continues the run in flight (`appendStageEvent` in `server/lib/lanes.js`), because detection bounces within one feature and `runs` is what every pass rate on the Workflows page is divided by + `SETTLE_MS` in `server/lib/cc-reload.js` — the two reload commands are typed a second apart, and `reloadOpenSessions` is now async, because Claude Code swallows the Enter after a slash command and back-to-back sends merged into one composer line + v1.6.0 (2026-09-14) + the lane strip's drag/Alt-arrow reordering and inline rename (`client/src/lib/laneOrderStorage.ts`, `LaneStripCard`'s `index`/`onReorder` props, the Workspace detail header's rename field, and `normalizeTitle`/`bindable` in `server/lib/lanes.js`) + the uncommitted-files hover panel (`LaneGitFilesPanel` in `LaneCard`, and `files` from `GET /api/lanes/:id/git` now being `{path,status,added,deleted}` records off one extra `git diff --numstat HEAD`) + AI Router profiles (`server/lib/ai-routers.js`, `server/lib/router-apply.js`, the Settings tab `/settings?tool=ai-router`, its **Test** button / `POST /api/ai-routers/test`, the per-lane router select — labelled **Model**, `LaneRouterRow` exported from `LaneCard` and rendered in the Workspace lane-detail header row — and `lanes.router_profile`) + the bootstrap's superseded-build guard and plugin-cache pruner (`supersededBy`/`pruneRetiredPluginRoots` in `scripts/plugin-bootstrap.js`, `unitRoot` in `scripts/systemd-service.js`) + v1.5.6 (2026-09-11) + the systemd handover rule below (`scripts/systemd-service.js`'s `writeUserService`/`restartUserService` split and `plugin-bootstrap.js`'s deferred `pendingSystemdRestart`) + eb63569 (2026-09-10) + release-based update detection (`server/lib/update-check.js` reads the forge releases API — a checkout via its `origin` remote, a plugin-cache install via the marketplace manifest on disk, since an archive-sourced cache dir has no `.git`; a `plugin_managed` install self-updates via the detached `plugin-update` chain) + the install-wide **Update all** batch and session reload (`server/lib/cc-update-all.js`, `server/lib/cc-reload.js`)._ A change that makes any statement in this file, `AGENTS.md`, or a README wrong — a moved path, a new or changed extension point, a retired rule — updates that file in the same change-set and bumps this marker.
+_Last synced: v1.6.9 (2026-09-17) + per-profile Claude quota (`server/lib/cc-usage.js`, `POST /api/cc-config/profiles/usage`, the **Check quota** button in the Profiles modal) — a POST because a saved profile's token is normally expired, so answering refreshes it and the refresh ROTATES the credentials written back to disk, which is also why it never runs on a poll + the settings patch that changes nothing now writing nothing (`patchSettings` in `server/lib/cc-mutate.js`, plus `.claude/.cc-config-backups/` in a lane's git exclude) + the Add-lane modal closing itself on a clean setup and offering a real Close when a step failed + a lane's router pick no longer landing on whichever lane the user switched to mid-apply (`LaneRouterRow`), nor reverting on the next lane switch — `POST /api/lanes/:id/router/apply` now `broadcastLane`s like every other mutating lane route, so the client's cached row stops disagreeing with what was written + a run being opened by a DECLARATION only — a backwards DETECTION now continues the run in flight (`appendStageEvent` in `server/lib/lanes.js`), because detection bounces within one feature and `runs` is what every pass rate on the Workflows page is divided by + `SETTLE_MS` in `server/lib/cc-reload.js` — the two reload commands are typed a second apart, and `reloadOpenSessions` is now async, because Claude Code swallows the Enter after a slash command and back-to-back sends merged into one composer line + v1.6.0 (2026-09-14) + the lane strip's drag/Alt-arrow reordering and inline rename (`client/src/lib/laneOrderStorage.ts`, `LaneStripCard`'s `index`/`onReorder` props, the Workspace detail header's rename field, and `normalizeTitle`/`bindable` in `server/lib/lanes.js`) + the uncommitted-files hover panel (`LaneGitFilesPanel` in `LaneCard`, and `files` from `GET /api/lanes/:id/git` now being `{path,status,added,deleted}` records off one extra `git diff --numstat HEAD`) + AI Router profiles (`server/lib/ai-routers.js`, `server/lib/router-apply.js`, the Settings tab `/settings?tool=ai-router`, its **Test** button / `POST /api/ai-routers/test`, the per-lane router select — labelled **Model**, `LaneRouterRow` exported from `LaneCard` and rendered in the Workspace lane-detail header row — and `lanes.router_profile`) + the bootstrap's superseded-build guard and plugin-cache pruner (`supersededBy`/`pruneRetiredPluginRoots` in `scripts/plugin-bootstrap.js`, `unitRoot` in `scripts/systemd-service.js`) + v1.5.6 (2026-09-11) + the systemd handover rule below (`scripts/systemd-service.js`'s `writeUserService`/`restartUserService` split and `plugin-bootstrap.js`'s deferred `pendingSystemdRestart`) + eb63569 (2026-09-10) + release-based update detection (`server/lib/update-check.js` reads the forge releases API — a checkout via its `origin` remote, a plugin-cache install via the marketplace manifest on disk, since an archive-sourced cache dir has no `.git`; a `plugin_managed` install self-updates via the detached `plugin-update` chain) + the install-wide **Update all** batch and session reload (`server/lib/cc-update-all.js`, `server/lib/cc-reload.js`)._ A change that makes any statement in this file, `AGENTS.md`, or a README wrong — a moved path, a new or changed extension point, a retired rule — updates that file in the same change-set and bumps this marker.
 
 ## Project mission
 - Maintain a reliable local-first dashboard for Claude Code session monitoring.