feat(desktop): show toast with release notes link when app updates to a new version

[shoaib050326]

Summary

When the desktop app is updated to a new version, a toast now appears on the
next launch announcing the new version with a button linking to the GitHub
release notes.

This addresses the lack of in-app feedback after an update — users previously
had no indication that something changed or where to find release notes.

Changes

• Added shouldShowNewVersionToast, acknowledgeCurrentVersion,
  readLastAcknowledgedVersion, and getNewVersionReleaseNotesUrl to
  desktopUpdate.logic.ts — pure functions that compare the running version
  against a localStorage-persisted acknowledged version.
• Created NewVersionToastCoordinator.tsx — a coordinator component that
  subscribes to useDesktopUpdateState() and triggers the toast when the
  version changes.
• Mounted the coordinator in __root.tsx inside the ToastProvider.

Behavior

Scenario	Result
First launch (no prior version stored)	No toast; current version persisted
Version matches acknowledged version	No toast
Version differs from acknowledged version	Toast: "Updated to vX.Y.Z" + "View release notes" button
Click "View release notes"	Opens https://github.com/pingdotgg/t3code/releases/tag/vX.Y.Z
Browser mode (no desktop bridge)	No-op (update state is null)
Updates disabled	No-op

Risk

Low. All new code is client-side only, uses localStorage for persistence
(gracefully handles unavailable storage), and follows the exact coordinator
pattern used by SlowRpcAckToastCoordinator. The toast is informational only
— no blocking, no side effects.

Rollback

Revert the four touched files.

Closes #2309

---

Note

Low Risk
Low risk: adds an informational client-side toast driven by desktop update state and localStorage, with guarded access/fallbacks and no server-side or auth changes.

Overview
Shows an “Updated to vX.Y.Z” persistent toast after the desktop app launches on a new version, with an action to open GitHub release notes (via desktopBridge.openExternal when available, otherwise window.open).

Introduces desktopUpdate.logic helpers to track the last acknowledged version in localStorage and decide when the toast should appear, adds coverage for this logic, and mounts the new NewVersionToastCoordinator in the authenticated root route.

^{Reviewed by Cursor Bugbot for commit 84b0444. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Show a toast with release notes link when the desktop app updates to a new version

• Adds NewVersionToastCoordinator, a client-side component mounted in the authenticated root that watches desktop update state and shows a persistent success toast when a new version is detected.
• The toast includes an action button that opens the GitHub release notes URL for the new version via desktopBridge.openExternal or window.open.
• Adds utilities in desktopUpdate.logic.ts to construct the release notes URL, check whether the toast should be shown, and persist the acknowledged version to localStorage to prevent repeat toasts.
• The toast only appears when updates are enabled, a current version exists, and the version differs from the last acknowledged version stored in localStorage.

^{Macroscope summarized 84b0444.}

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Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[macroscopeapp]

Approvability

Verdict: Needs human review

This PR introduces a new user-facing feature (toast notifications on app updates) with a new globally-mounted component and localStorage-based state tracking. New features with user-facing behavior warrant human review even when well-scoped.

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