fix(web): prefer desktop runtime version in desktop UI

[copypasteitworks]

Closes #947

Follow-up to #720.

What Changed

• Prefer desktopUpdateState.currentVersion over APP_VERSION when running under Electron
• Reuse a shared useDesktopUpdateState hook in both the sidebar and Settings
• Keep APP_VERSION as the fallback for normal browser usage

Why

The desktop UI was showing the web bundle version instead of the installed desktop runtime version.

This keeps the fix scoped to display logic only. No updater behavior or install flow changed.

UI Changes

Affected UI:

• sidebar version tooltip
• Settings > About

Before:

• See Wrong Version number inside Settings #947 for the stale version example reported by users.

After:

• The same UI now shows the desktop runtime's current version when running in Electron.

Validation

• bun fmt
• bun lint
• bun typecheck
• bun run --cwd apps/web test src/hooks/useDesktopUpdateState.test.ts

Context

• Display application version in sidebar and settings #720 added the version display
• Settings/About shows 0.0.9 after updating to v0.0.10 #928 reported the stale version symptom on v0.0.10

Validation

• This PR is small and focused
• I explained what changed and why

Note

Show desktop runtime app version in sidebar and settings version display

• Extracts desktop update state management into a useDesktopUpdateState hook in useDesktopUpdateState.ts, replacing inline useEffect logic in the sidebar.
• Adds resolveDisplayedAppVersion to return the runtime-reported version when running in Electron, or the build-time APP_VERSION as a fallback.
• Updates both the sidebar version tooltip (Sidebar.tsx) and the settings page version field (_chat.settings.tsx) to use this resolved version.

^{Macroscope summarized eea2d83.}

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