Windows compatibility pass (beta target)

External editor via cmd/start + exe picker; Permissions hidden for
Windows-local (chmod only flips read-only there); Explorer/Recycle Bin
wording; Ctrl vs Cmd shortcut labels; separator-aware path joins +
drive-root detection; drives list in the panel source picker; icon.ico
+ colored tray icon; icacls ACL on connections.json; README Windows
(beta) section with upstream known issues and a smoke-test checklist.
Runtime paths pending first boot on a real Windows machine.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

package.json

@@ -24,6 +24,7 @@
 		"@resvg/resvg-js": "^2.6.2",
 		"@types/bun": "latest",
 		"@types/ssh2": "^1.15.5",
+		"png-to-ico": "^3.0.2",
 		"typescript": "~5.9.3"
 	},
 	"trustedDependencies": [