fix(macos): prevent corrupted small app icons

[LJAYi]

Summary

Fix corrupted OpenLogi artwork in macOS small-icon surfaces such as Login Items.

The Rust icns encoder writes the 16×16 and 32×32 images as icp4/icp5 PNG chunks. Although the embedded PNG data is valid, macOS decodes those slots as corrupted pixels. Generating the family with Apple’s native tools produces a compatible chunk layout and restores the expected icon.

Changes

• generate the iconset with sips and encode it with iconutil
• remove the direct icns and image dependencies from xtask
• regenerate AppIcon.icns without the problematic icp4/icp5 chunks

Testing

• cargo fmt --all -- --check
• cargo xtask macos icns
• cargo clippy -p xtask --all-targets -- -D warnings
• cargo test -p xtask
• cargo clippy --workspace --exclude openlogi-gui --all-targets -- -D warnings
• cargo test --workspace --exclude openlogi-gui
• cargo clippy --workspace --all-targets --features gpui_platform/runtime_shaders -- -D warnings
• cargo test --workspace --features gpui_platform/runtime_shaders
• extracted the generated ICNS with iconutil and verified the 16×16 and 32×32 PNGs

Hardware verification: not performed. This machine has Apple Command Line Tools but cannot run GPUI’s default offline Metal compilation without accepting/configuring the full Xcode toolchain; the supported runtime_shaders path passed the full workspace Clippy and test suites.

Reproduction

[greptile-apps]

Greptile Summary

The PR replaces Rust-based ICNS encoding with Apple’s native macOS icon tools to avoid corrupted small icons.

• Generates the standard iconset sizes with sips and packages them with iconutil.
• Removes the no-longer-needed icns and image dependencies from xtask.
• Regenerates the bundled AppIcon.icns.

Confidence Score: 5/5

The PR appears safe to merge, with no concrete changed-code failures identified.

The generated iconset follows Apple’s expected naming and size layout, native-tool failures propagate to callers, and the dependency removals match the deleted Rust encoder implementation.

Important Files Changed

Filename	Overview
xtask/src/commands/macos/bundle.rs	Replaces in-process image resizing and ICNS serialization with temporary iconset generation through native macOS tools; no actionable defect identified.
xtask/Cargo.toml	Removes the obsolete direct icns and image dependencies consistently with the implementation change.
Cargo.lock	Removes the corresponding dependency entries without introducing or upgrading unrelated packages.
crates/openlogi-gui/icon/AppIcon.icns	Regenerates the binary application icon using the new native-tool workflow.

_{Reviews (1): Last reviewed commit: "fix(macos): prevent corrupted small app ..." | Re-trigger Greptile}