feat(update): surface 'updates paused' for diverged devices + one-click reset to channel

[KrasimirKralev]

Why

A device on a non-release branch with local commits gets every update silently withheld: getTargetVersion only offers a release tag that's a forward-ancestor of HEAD, so a diverged HEAD returns null → the System Update screen shows "You're up to date" forever and the device never receives fixes. We hit this three times — two dev boxes (georgi, the telegram-pairing box on clawbox.local) and the same trap can catch a customer box whose on-box AI agent commits to the repo. The box looks current and silently stops updating.

What

• updater.ts
  • getChannelDivergence() — detects local commits the release channel lacks (ahead > 0 && behind > 0, via a single git rev-list --left-right --count origin/<channel>...HEAD). Requires behind > 0 so a box merely ahead of the channel (a dev box on a local tag, nothing newer to install) isn't nagged. Reuses the fetch getTargetVersion already ran — no extra network I/O.
  • getVersionInfo now returns diverged / pausedReason / channel.
  • forceResetToChannel() — pins .update-branch to the channel (the pin, else main; deliberately not the current branch) so the existing hard-sync targets the channel and discards the diverged commits, then runs the normal update. The pin also stops the device re-diverging silently.
• POST /setup-api/update/reset — thin route over forceResetToChannel.
• SystemUpdateApp.tsx — a paused state replaces the misleading "up to date" hero with the reason + a "Reset to <channel> & update" button, gated behind a confirm modal (it's destructive — discards local commits). The "CURRENT" card is hidden while paused. The channel shown is the backend's versions.channel (single source of truth, can't drift from what the reset targets).
• Unit tests for divergence detection (diverged vs behind-only/ahead-only).

Notes / verification

• bash/type-level: this is plain TS; the new logic is covered by the unit tests added here — CI runs typecheck + vitest. I'll watch CI + CodeRabbit and fix anything red before merge.
• Reuses the existing, battle-tested update path (startUpdate → updateClawBoxAndReboot); the reset's reset --hard origin/<channel> is the same hard-sync used today.
• Closes the silent-no-update gap for georgi, the telegram box, and any agent-modified customer box.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: 4abf683b-ec09-4f4e-83d3-9d255daf0071

📥 Commits

Reviewing files that changed from the base of the PR and between 65baf52 and 5080d55.

📒 Files selected for processing (4)

• src/app/setup-api/update/reset/route.ts
• src/components/SystemUpdateApp.tsx
• src/lib/updater.ts
• src/tests/unit/updater.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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