feat(desktop): add adaptive macOS app icon

[murongg]

Summary

• add an Icon Composer source with appearance-specific Markra foreground colors and a native system background
• compile and bundle Assets.car during macOS Tauri builds while retaining the legacy .icns fallback
• move Apple Silicon and Intel release jobs to macOS 26 runners with Xcode 26

Why

macOS 26 can select the matching light or dark app icon for Finder, Dock, Launchpad, and desktop aliases even when Markra is not running. This uses the native icon asset system instead of runtime icon switching.

Validation

• pnpm test passed (2,332 tests)
• pnpm build passed
• cargo test --manifest-path apps/desktop/src-tauri/Cargo.toml --locked passed (234 tests)
• pnpm tauri build --debug produced the macOS app and DMG bundles
• xcrun assetutil --validate-file accepted the bundled asset catalog
• macOS IconServices rendered distinct default and dark outputs without launching Markra

Risk

• macOS packaging now requires Xcode 26 or later; release jobs use the corresponding GitHub-hosted runners
• older macOS versions continue to use the existing .icns fallback
• non-macOS icon build invocations remain no-ops

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Project	Deployment	Actions	Updated (UTC)
markra-web	Ready	Preview, Comment	Jul 13, 2026 12:27am