Update system overhaul

[shivamhwp]

Supersedes & closes #1123
Supersedes & closes #1116
Fixes : #1204

What Changed

• Brought over the desktop update workflow from the existing update PRs by cherry-picking their commits so attribution is preserved.
• Moved the desktop update affordance into a dismissible sidebar footer pill.
• Added a dedicated About section in Settings alongside General and Archived.
• Added a single Version card in Settings > About with the current version shown inline next to the label and a contextual update action on the right.
• Cleaned up the settings UI by removing duplicated section headers from the page body and shortening the sidebar label from Archived threads to Archived.
• Merged the latest main into this branch and resolved the sidebar update UI conflict in favor of the extracted pill-based workflow.

Why

• The old update entry points were split across different places and were easy to miss.
• This keeps the high-visibility sidebar update workflow from one PR while also adding a discoverable manual update entry point in Settings.
• Keeping the Settings About screen compact avoids duplicate cards and redundant labels, which makes version/update information easier to scan.
• Cherry-picking the original commits avoids reimplementation and preserves authorship for the existing work.

UI Changes

• Sidebar:
  • Update status now appears as a dismissible pill above the Settings button in the left sidebar.
• Settings:
  • Added an About section in the settings sidebar.
  • About now shows a single Version row with the current version inline and the update action on the right.
  • Removed repeated uppercase section titles from the settings content area.
  • Renamed Archived threads to Archived in the settings sidebar.

ps: to better see the ui changes, refer to #1123 and #1116

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

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Note

Medium Risk
Touches the Electron auto-update surface area (new IPC endpoint and update-check control flow) and reshapes how update state is triggered/consumed in the UI, which could impact update reliability and user flows if miswired.

Overview
Refactors the desktop update UX: removes the old header/titlebar update button and replaces it with a dismissible sidebar footer update pill, plus a new Settings → About version row that can check/download/install updates with contextual labels/tooltips.

Adds a new desktop:update-check IPC handler and exposes it via DesktopBridge.checkForUpdate() so the renderer can trigger an update check and receive { checked, state }. Update state is now synced through a shared React Query cache (useDesktopUpdateState / setDesktopUpdateStateQueryData), and installing updates now prompts for confirmation warning that running tasks will be interrupted.

Updates desktop update decision logic (e.g., prefer install when downloadedVersion exists, adds canCheckForUpdate, adjusts default tooltip copy) and includes associated test coverage.

^{Written by Cursor Bugbot for commit 2928da6. This will update automatically on new commits. Configure here.}

Note

Move desktop update controls to sidebar footer pill and Settings panel

• Replaces the title bar update button with a SidebarUpdatePill in the sidebar footer, which supports download, install, architecture warnings, and a dismiss option for the download-available state.
• Adds an AboutVersionSection to the General Settings panel in Electron builds with a context-aware Check/Download/Install button, error toasts, and confirmation before install.
• Exposes a new checkForUpdate() method on desktopBridge via the desktop:update-check IPC channel, returning a DesktopUpdateCheckResult with a checked flag and current updater state.
• Adds useDesktopUpdateState hook that keeps desktop update state in sync with react-query cache via the main process event stream.
• Behavioral Change: the default tooltip for idle/non-actionable update states changes from "Update available" to "Up to date"; install actions now require user confirmation before proceeding.

^{Macroscope summarized 2928da6.}

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

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Duplicate ARM64 Intel build warnings in sidebar

Medium Severity

The new SidebarUpdatePill renders its own "Intel build on Apple Silicon" alert in the sidebar footer, but the pre-existing ARM64 warning in the Sidebar content area (inside SidebarContent) was never removed. Both are rendered in the !isOnSettings branch, so Apple Silicon users running Intel builds see two simultaneous warnings — one at the top of the project list and one above the Settings button.

Additional Locations (1)

• apps/web/src/components/Sidebar.tsx#L1796-L1818