fix(packaging): install AUR launcher icons where icon themes look

[AugusDogus]

What Changed

• t3code-bin and t3code-nightly-bin install the launcher icon from the AppImage's own hicolor icon set (16-512px, named per package) instead of a separately downloaded 1024px PNG
• packaging/aur/scripts/release.sh no longer fetches the icon asset or manages its checksum

Why

Since the AUR recipes moved in-repo (#4128), the launcher icon has been installed only under usr/share/icons/hicolor/1024x1024/apps/. hicolor-icon-theme registers sizes only up to 512x512, and freedesktop icon lookup never scans unregistered directories, so GNOME and KDE show a generic icon for every nightly published since 2026-08-15. The previous out-of-repo recipe had the same 1024 path but was masked by a legacy /usr/share/pixmaps copy that the rewrite dropped.

The AppImage payload already ships the channel-correct icon pre-rendered at every registered hicolor size (the same set electron-builder's deb/rpm targets install), so the packages now reuse it and the extra download goes away.

Verified by building both packages and running GTK icon-theme lookups against the extracted contents (previously NOT FOUND at every size, now resolving 16 through 512), plus a live before/after on Arch + GNOME with a fully stock configuration.

UI Changes

Before (published t3code-nightly-bin 0.0.34_nightly.20260818.1124-1) / after:

Implemented with Claude Fable 5 in Claude Code.

Note

Install AUR launcher icons from AppImage hicolor directories instead of a single downloaded PNG

• Both t3code-bin PKGBUILD and t3code-nightly-bin PKGBUILD now extract icons from the AppImage's squashfs-root/usr/share/icons/hicolor/*/apps/ and install them into matching hicolor size directories, so icon themes can find them.
• Removes the separately downloaded 1024x1024 icon PNG from the source arrays and their sha256sum entries.
• The release.sh script no longer fetches the icon asset or updates its checksum in PKGBUILD during release.

^{Macroscope summarized b72d9d8.}

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Note

Low Risk
Packaging-only changes to icon install paths and release checksum updates; no runtime app or auth logic touched.

Overview
Fixes missing launcher icons on GNOME/KDE by stopping installation of a separately downloaded 1024×1024 PNG (a size hicolor themes do not register) and copying every hicolor/*/apps/t3code.png from the extracted AppImage into the package at the matching theme sizes (t3code.png / t3code-nightly.png).

Both t3code-bin and t3code-nightly-bin PKGBUILDs drop the extra icon source entry and checksum; release.sh no longer fetches the repo icon asset or patches its SHA256 in PKGBUILD.

^{Reviewed by Cursor Bugbot for commit b72d9d8. Bugbot is set up for automated code reviews on this repo. Configure here.}

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[macroscopeapp]

Approvability

Verdict: Approved at b72d9d8

Macroscope's review found this PR approvable — This PR only modifies AUR packaging scripts to fix icon installation - no application runtime code is affected. The change simplifies the build by using bundled icons from the app package at sizes supported by icon themes (≤512x512) instead of downloading a non-standard 1024x1024 icon.

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