fix(desktop): Include standard Linux AppImage icons for Niri/Noctalia

[mwolson]

Summary

Closes #2331.

This adds standard hicolor icon sizes to Linux AppImage builds so AppImageLauncher and desktop shells can resolve the integrated T3 Code icon reliably.

Problem and Fix

Problem and Why it Happened	Fix
The AppImage build only staged a single large icon.png, which some desktop icon lookups (such as Noctalia on Niri) do not resolve after AppImageLauncher integration.	Generate standard hicolor PNG sizes from the selected Linux icon source and point electron-builder at the generated icon directory.
Linux release runners may not have the ImageMagick command needed to generate resized icons.	Install ImageMagick in the Linux release job when neither magick nor convert is available.

Validation

• bun fmt
• bun lint
• bun typecheck
• bun run --filter @t3tools/scripts test -- build-desktop-artifact

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes: N/A, packaging-only change
• I included a video for animation/interaction changes: N/A

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Note

Low Risk
Packaging and CI-only changes with no runtime app logic, auth, or data handling impact.

Overview
Linux AppImage packaging now stages a full hicolor-style icon set (16–512px PNGs under icons/) instead of relying on a single icon.png, and electron-builder is pointed at that directory so launchers and AppImageLauncher can resolve the app icon reliably.

The desktop build script resizes icons with ImageMagick (magick, falling back to convert), and the Linux release workflow installs ImageMagick when neither command is present. The Windows Spectre MSVC step is only re-indented.

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Note

Include standard Linux AppImage icons by generating resized PNGs with ImageMagick

• Adds stageLinuxIconSize to build-desktop-artifact.ts which uses magick (falling back to convert) to generate PNGs at standard Linux icon sizes [16, 22, 24, 32, 48, 64, 128, 256, 512].
• Updates stageLinuxIcons to populate an icons/ directory with these resized images, and updates createBuildConfig to point Electron Builder at that directory instead of a single icon.png.
• Adds an 'Install ImageMagick' step in release.yml to ensure ImageMagick is available on Linux runners before the build runs.
• Risk: if neither magick nor convert is present and the apt install step fails, the Linux build will fail with a BuildScriptError.

^{Macroscope summarized 031b210.}

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Approvability

Verdict: Approved

Build/CI-only changes that add ImageMagick installation and icon generation for Linux AppImage packaging. No application runtime behavior is affected - this is purely about generating proper icon sizes during the desktop build process.

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