Fix Windows taskbar icon showing Electron instead of BadCode

[badcuban]

Priority: P1

User report

The desktop app shows the Electron icon in the Windows taskbar instead of the BadCode icon.

Why

This is a visible branding defect in the installed desktop app. It may also indicate a mismatch between packaged resources, BrowserWindow icon options, Windows AppUserModelID, and shortcut/installer metadata.

Starting points

• apps/desktop/src/window/DesktopWindow.ts resolves and passes BrowserWindow icon options.
• apps/desktop/src/app/DesktopAssets.ts resolves runtime icon resource paths.
• apps/desktop/src/app/DesktopAppIdentity.ts configures app identity/AppUserModelID and dock icon behavior.
• scripts/build-desktop-artifact.ts stages platform icons and electron-builder metadata.
• assets/prod/badcode-windows.ico is the production Windows icon source.

Acceptance criteria

• Running the packaged Windows app shows the BadCode icon in the taskbar.
• The taskbar icon remains correct after pinning/unpinning and relaunching.
• Dev/nightly/prod channels use their intended icons where applicable.
• Add or update desktop/build tests around Windows icon metadata where practical.
• Document any Windows shell cache caveats if they affect verification.

[badcuban]

v0.0.7 includes a packaging fix and test coverage for this: the Windows build now copies apps/desktop/resources/icon.ico as an unpacked extra resource so DesktopAssets can resolve the BadCode icon at runtime. Release workflow passed and v0.0.7 was published. I am leaving this open until the installed app is manually verified on Windows for taskbar icon, pin/unpin, and relaunch behavior, because Windows shell icon cache behavior cannot be proven from CI alone. Release: https://github.com/badcuban/badcode/releases/tag/v0.0.7

[badcuban]

Closing as completed based on owner confirmation that the Windows taskbar icon is already fixed.