fix(desktop): refine environment dock icons

Author: Sg312

apps/desktop/README.md

@@ -100,7 +100,7 @@ Local unsigned build: `bun run package:dir` (app in `release/mac-universal/`). S
 
 Pre-release share (no Developer ID yet): `SIM_DESKTOP_DEFAULT_ORIGIN=https://www.dev.sim.ai bun run package:share` builds a DMG whose fresh installs default to that origin (baked at build time; official builds leave it unset → prod) and skips per-file signature timestamps. Recipients must clear quarantine once: `xattr -cr /Applications/Sim.app`.
 
-The build also derives the app icon from `SIM_DESKTOP_DEFAULT_ORIGIN`. Every channel uses the exact production icon with its white background and black `sim` mark. Non-production channels add a thick border using existing platform colors: dev uses orange, staging uses Loop blue, and localhost uses Workflow violet. The macOS menu-bar icon also carries a compact `D`, `S`, or `L` subscript for those environments; production remains unmarked. Packaged `.icns` files live in `build/`; `scripts/build.ts` copies the selected variant to the ignored `build/generated-icon.icns` path consumed by electron-builder. Matching 512px PNGs in `static/` provide the Dock icon for unpackaged runs.
+The build also derives the app icon from `SIM_DESKTOP_DEFAULT_ORIGIN`. Every channel uses the exact production icon with its white background and black `sim` mark. Non-production channels add a thin outline using existing platform colors: dev uses orange, staging uses Loop blue, and localhost uses Workflow violet. The macOS menu-bar icon also carries a compact `D`, `S`, or `L` subscript for those environments; production remains unmarked. Packaged `.icns` files live in `build/`; `scripts/build.ts` copies the selected variant to the ignored `build/generated-icon.icns` path consumed by electron-builder. Matching 512px PNGs in `static/` provide the Dock icon for unpackaged runs.
 
 CI (`.github/workflows/desktop-release.yml`, wired into `ci.yml`):
 - Runs only after `create-release` on a `vX.Y.Z:` commit to main — **never before**: `scripts/create-single-release.ts` skips creation if the tag exists, so a desktop job publishing first would eat the changelog. The job builds `--publish never` and uploads assets with `gh release upload --clobber` (idempotent re-runs).