chore(packaging): refresh v0.4.0 metadata

[bolens]

Summary

• update flake and stable AUR versions to v0.4.0
• refresh tagged source and Linux release archive hashes
• convert binary hashes to Nix SRI
• refresh all checked-in .SRCINFO files and the appicon-git placeholder

Validation

• make check-packaging-versions
• make check
• APPICON_BUILD_NIX=1 APPICON_REQUIRE_BIN=1 make build-packaging
• v0.4.0 checksums and keyless signature verified with cosign v2.6.5

[Copilot]

Pull request overview

Refreshes packaging metadata across AUR and Nix to align with the v0.4.0 release, including updated version pins and checksum material for source and binary artifacts.

Changes:

• Bumps AUR appicon and appicon-bin to 0.4.0 and refreshes their sha256 sums.
• Updates AUR appicon-git version/provides metadata to match the current git describe output.
• Updates Nix flake version to 0.4.0 and refreshes Linux release asset hashes (SRI) in nix/packages.nix.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packaging/aur/appicon/PKGBUILD	Bump stable AUR package version to v0.4.0 and update source tarball checksum.
packaging/aur/appicon/.SRCINFO	Regenerate stable AUR metadata for v0.4.0 (version/source/hash).
packaging/aur/appicon-git/PKGBUILD	Refresh VCS AUR pkgver placeholder for latest upstream revision.
packaging/aur/appicon-git/.SRCINFO	Regenerate VCS AUR metadata (pkgver/provides).
packaging/aur/appicon-bin/PKGBUILD	Bump binary AUR package version to v0.4.0 and update per-arch checksums.
packaging/aur/appicon-bin/.SRCINFO	Regenerate binary AUR metadata for v0.4.0 (URLs + per-arch hashes).
nix/packages.nix	Update Nix SRI hashes for v0.4.0 Linux release assets.
flake.nix	Bump Nix flake version to v0.4.0.

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