[JetSquirrel]

Replaces the cloud in the menu bar and notification area with the new app icon's arch bridge, so it matches the icon from #74. There is no linked issue.

What changed

• Normal: a solid arch bridge with three dots above it, in one colour.
• An alert is open: an exclamation mark replaces the dots. The old icon cut the mark out of the cloud, but there's no room to do that here.
• Same behaviour otherwise: still black template on macOS and #8a8a8a grey on Windows, still drawn in code at 44 pixels. Clicks, the title, the tooltip and the alert logic are unchanged.

It isn't a trace of assets/icon.svg. A first draft with a thin deck and arch looked like a bench at 16 pixels, so this version has a thick body with the arch cut through it. The dots are in roughly the app icon's positions.

The shape is now a pure function, icon_covers, so tests can read it without creating a platform icon.

Testing

Run locally on Windows:

• cargo test: all passing, with four new tests covering the arch opening, what an alert changes, the gaps in the mark and that nothing touches the icon's edge.
• cargo clippy --all-targets -- -D warnings and cargo fmt --check: clean.
• cargo +nightly-2026-07-28 check --lib --target wasm32-unknown-unknown: passes. The tray isn't compiled for wasm.

I also dumped the pixels icon_rgba produces and viewed them at 16 to 44 pixels on dark and light backgrounds. Bridge, dots and mark are all distinct at 16.

Not seen in a real taskbar or menu bar, and not built on macOS. Please check:

• Windows: the icon is legible in the notification area on dark and light taskbars, at 100% and a higher display scale.
• Windows: it switches to the exclamation mark when an alert opens, and back when the last one closes.
• macOS: it tints correctly as a template in light and dark menu bars, including the alert state.
• The dots are recognisable as the app icon's. If the shape needs adjusting, the coordinates are all in icon_covers.

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