Sync desktop native theme with web theme setting

[Noojuno]

What Changed

Updated the window theme to match the app theme configured in the settings page.

Why

Currently, the window title bar follows the system theme rather than the app theme. This is problematic on Windows as we use the default title bar.

UI Changes

Not sure what the deal is with the bitrate, will have to figure that out at not 12am.

Before:

You can see that the window title bar always follows the system colour, regardless of the theme setting.

explorer_av2gXFabJ6.mp4

After:

We now respect the theme setting.

explorer_NsRBucWdL4.mp4

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

Sync Electron's native theme with the web app's theme setting

• Adds a setTheme method to window.desktopBridge (via preload.ts) that sends the active theme over the desktop:set-theme IPC channel.
• Registers an IPC handler in main.ts that validates the theme value ('light' | 'dark' | 'system') and sets nativeTheme.themeSource accordingly.
• Extends useTheme.ts to call the bridge after each applyTheme invocation, with deduplication to avoid redundant IPC calls and retry logic on failure.

^{Macroscope summarized cab2240.}

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