feat: move update button to sidebar footer as dismissable pill

[Noojuno]

What Changed

• Move the desktop update button from the sidebar header to the footer, displayed as a pill above the Settings button. The pill shows contextual states: "Update available", "Downloading (X%)", and "Restart to update".
• Add a dismiss button that hides the notification until the next app launch.

Why

It was a little unclear when there was a new update available. This change is to increase clarity and make it very obvious when there is a new update.

UI Changes

Update process

Note: This process was mocked, so we didn't actually restart the app.

Screen.Recording.2026-03-15.at.11.33.42.PM.mov

Dismiss

Screen.Recording.2026-03-15.at.11.34.03.PM.mov

arm64 running intel warning

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

Note

Move desktop update button to a dismissable pill in the sidebar footer

• Removes the rocket button and inline Apple Silicon warning alert from the sidebar header in Sidebar.tsx.
• Adds a new SidebarUpdatePill.tsx component rendered in the sidebar footer that subscribes to Electron's desktopBridge update events.
• The pill shows download progress, triggers downloadUpdate or installUpdate, displays a 'Restart to update' label when ready to install, and can be dismissed until next launch during the download phase.
• The Apple Silicon Intel-build warning alert is preserved, now rendered inside SidebarUpdatePill.

^{Macroscope summarized 1303272.}

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[UtkarshUsername]

I think it can be a little lighter or of some different color. This is looking to bright