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>

src/bun/fs/local.ts

@@ -47,6 +47,22 @@ function resolveId(kind: "user" | "group", id: number): string | undefined {
 	return name;
 }
 
+/**
+ * Drive roots for the Windows panel source picker ("C:\", "D:\", …).
+ * PORTABILITY: win32-only concept; empty elsewhere ("/" is always reachable).
+ */
+export function listLocalDrives(): string[] {
+	if (process.platform !== "win32") return [];
+	try {
+		const proc = Bun.spawnSync(["fsutil", "fsinfo", "drives"], { stdout: "pipe", stderr: "ignore" });
+		if (!proc.success) return [];
+		// output: "Drives: C:\ D:\ ..."
+		return [...proc.stdout.toString().matchAll(/[A-Za-z]:\\/g)].map((m) => m[0]);
+	} catch {
+		return [];
+	}
+}
+
 function toEntry(name: string, full: string, st: Stats): FileEntry {
 	return {
 		name,