Improve Linux desktop identity packaged builds

[Chrono-byte]

• Set Linux WM class and desktop entry naming consistently
• Align desktop artifact packaging with the new app name

What Changed

Linux desktop environments were not matching the running Electron app to its packaged desktop entry. The AppImage launched, but the shell surfaced it as t3-code-desktop with the generic icon instead of the proper icon.

This happened because the Linux app identity was inconsistent across packaging and runtime. The staged package name, executable name, desktop entry name, and Chromium/Electron window class were not aligned closely enough for GNOME/AppImage integration to associate the live window with the installed desktop metadata.

This change makes the Linux identity consistent so installed AppImage builds resolve to the correct app name and icon in the shell.

Why

Before:

After:

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes

Note

Set Linux WM class and desktop entry name for packaged desktop builds

• Sets the --class Chromium switch to t3code (or t3code-dev in dev) on Linux startup in main.ts, and calls app.setDesktopName with the matching .desktop filename when supported.
• Updates build-desktop-artifact.ts to set executableName: 't3code', add StartupWMClass: 't3code' to the .desktop entry, and rename the staged package from t3-code-desktop to t3code.
• Behavioral Change: the Linux executable name and package metadata name change from t3-code-desktop to t3code, which affects install paths and desktop integration on existing installs.

^{Macroscope summarized 97bf6ce.}

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[Copilot]

Pull request overview

This PR improves Linux desktop integration for the Electron desktop app by making the packaged app’s Linux identity (executable name, WM class, and desktop entry metadata) consistent, so GNOME/AppImage can correctly associate the running window with the installed desktop entry and icon.

Changes:

• Align Linux packaging metadata by setting a consistent executableName and StartupWMClass, and adjust the staged package name used for builds.
• Set Linux WM class at runtime (--class=...) and set the desktop entry name from the Electron main process.
• Ensure the dev Electron launcher passes a Linux --class argument for consistent dev window identity.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
scripts/build-desktop-artifact.ts	Aligns Linux electron-builder metadata (executable + WM class) and updates staged packaging identity used to build artifacts.
apps/desktop/src/main.ts	Sets Linux WM class at runtime and configures the app’s desktop entry name for better shell association.
apps/desktop/scripts/dev-electron.mjs	Passes a Linux --class arg when launching Electron in dev to keep window identity consistent.

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[Copilot]

Pull request overview

This PR aligns the Linux desktop identity for the packaged Electron app so Linux shells (e.g., GNOME/AppImage integration) correctly associate the running window with the installed desktop entry (name/icon), by making the executable name, WM_CLASS, and desktop entry metadata consistent.

Changes:

• Set Linux executableName and desktop entry StartupWMClass to t3code in the electron-builder config.
• Rename the staged package.json name used for packaging from t3-code-desktop to t3code.
• Set Linux runtime WM class (--class) and desktop entry name (setDesktopName) based on dev vs packaged mode.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
scripts/build-desktop-artifact.ts	Aligns electron-builder Linux packaging identity (executableName, StartupWMClass) and staged package name with t3code.
apps/desktop/src/main.ts	Ensures the Linux runtime window class and desktop entry name match the packaged desktop metadata.
apps/desktop/scripts/dev-electron.mjs	Passes a Linux --class argument during dev launches to influence WM_CLASS.

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