fix(desktop): improve AppImage icon resolution

[Chrono-byte]

What Changed

• expand Linux icon lookup beyond the default Electron resource paths
• check AppImage-specific locations such as .DirIcon and bundled hicolor icon paths
• fall back to the packaged executable/icon naming used in the desktop build
• cache the resolved icon path to avoid repeated filesystem probing during startup

Why

The Linux desktop build could launch without the correct window/taskbar icon when run as an AppImage, because the app was only checking generic resource paths that do not reliably exist in the packaged AppImage layout. This change makes icon resolution follow the actual AppImage filesystem structure so the packaged app displays the correct icon consistently.

Note

Fix AppImage icon resolution on Linux in desktop app

Adds a resolveAppImageIconPath function in main.ts that searches AppImage-specific locations for a valid icon path when the bundled icon.<ext> resource is not found. It checks candidate roots derived from process.resourcesPath, the executable directory, APPDIR, and APPIMAGE, looking for .DirIcon and PNG files in hicolor icon theme paths. Results are memoized to avoid repeated filesystem checks on subsequent calls.

^{Macroscope summarized a2c238f.}

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[Copilot]

Pull request overview

Improves Linux desktop icon resolution (especially for AppImage packaging) by expanding the icon lookup paths and caching the resolved icon path to avoid repeated filesystem probing.

Changes:

• Add AppImage-specific icon resolution logic (e.g., .DirIcon, usr/share/icons/hicolor/...).
• Cache the resolved AppImage icon path to avoid repeated fs.existsSync checks.
• Refactor imports/types and remove the desktop theme IPC handler.

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[Chrono-byte]

My bad I pushed to the wrong remote across 2 pull requests, force pushed this one back.