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>

ui/src/app/file-panel/file-panel.html

@@ -63,13 +63,15 @@
   >
     <ng-icon name="mynaFilePlus" size="var(--action-icon)" />
   </button>
-  <button
-    (click)="run('chmod')"
-    title="Permissions"
-    class="grid size-(--action-h) shrink-0 place-items-center rounded-md text-muted-foreground hover:bg-accent hover:text-foreground"
-  >
-    <ng-icon name="mynaLock" size="var(--action-icon)" />
-  </button>
+  @if (chmodAvailable()) {
+    <button
+      (click)="run('chmod')"
+      title="Permissions"
+      class="grid size-(--action-h) shrink-0 place-items-center rounded-md text-muted-foreground hover:bg-accent hover:text-foreground"
+    >
+      <ng-icon name="mynaLock" size="var(--action-icon)" />
+    </button>
+  }
   <button
     (click)="run('delete')"
     title="Delete (F8 / Del)"
@@ -95,6 +97,17 @@
         }
       </button>
 
+      <!-- Windows drive roots (empty list elsewhere) -->
+      @for (drive of drives(); track drive) {
+        <button
+          (click)="pickDrive(drive)"
+          class="flex w-full items-center gap-2 py-1.5 pr-3 pl-6 text-left text-(length:--path-font) hover:bg-accent"
+        >
+          <ng-icon name="mynaHardDrive" size="var(--action-icon)" class="shrink-0 text-muted-foreground" />
+          <span class="flex-1 font-mono">{{ drive }}</span>
+        </button>
+      }
+
       @if (connections.grouped().loose.length || connections.grouped().stacks.length) {
         <div class="my-1 border-t border-border"></div>
       }

ui/src/app/file-panel/file-panel.ts

@@ -16,6 +16,7 @@ import { FileActionsService } from '../file-actions.service';
 import { fileGlyph, fileIconClass, fileKind } from '../file-icons';
 import { formatDate, formatMode, formatSize } from '../format';
 import { PanelsService, type Side, type SortKey } from '../panels.service';
+import { IS_WINDOWS } from '../platform';
 import { RpcService } from '../rpc.service';
 import { SettingsService } from '../settings.service';
 import { TransfersService } from '../transfers.service';
@@ -56,6 +57,10 @@ export class FilePanel {
 
   readonly pathDraft = signal('');
   readonly menuOpen = signal(false);
+  /** Windows drive roots for the source picker; always empty elsewhere. */
+  readonly drives = signal<string[]>([]);
+  /** chmod on Windows local files only flips the read-only bit — hide it. */
+  readonly chmodAvailable = computed(() => !(IS_WINDOWS && !this.isRemote()));
 
   private readonly listEl = viewChild.required<ElementRef<HTMLDivElement>>('list');
   private lastClickedIndex = 0;
@@ -79,7 +84,18 @@ export class FilePanel {
     void this.rpc.request.showColumnsMenu({ visible: this.settings.columns() });
   }
 
+  pickDrive(drive: string): void {
+    this.menuOpen.set(false);
+    this.activate();
+    void this.panel().load(drive);
+  }
+
   constructor() {
+    if (IS_WINDOWS && this.rpc.available) {
+      void this.rpc.request.listDrives({}).then((res) => {
+        if (res.ok) this.drives.set(res.drives);
+      });
+    }
     // keep the editable path bar in sync with the actual cwd
     effect(() => this.pathDraft.set(this.panel().cwd()));
     // focus follows the active side (Tab switches panels, dialogs refocus on close)