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/tab-bar/tab-bar.ts

@@ -3,7 +3,7 @@ import { NgIcon } from '@ng-icons/core';
 import { BRANDING } from '@shared/branding';
 import type { AccentTone } from '@shared/types';
 import { PanelsService } from '../panels.service';
-import { IS_MAC_CHROME } from '../platform';
+import { IS_MAC_CHROME, MOD_LABEL } from '../platform';
 import { RpcService } from '../rpc.service';
 import { SettingsService } from '../settings.service';
 
@@ -78,7 +78,7 @@ const CONCURRENCY_CHOICES = [2, 3, 4, 6, 8] as const;
           @if (panels.workspaces().length > 1) {
             <button
               (click)="close($event, ws.id)"
-              title="Close tab (⌘W)"
+              [title]="'Close tab (' + modLabel + 'W)'"
               class="mr-1 grid size-4 shrink-0 place-items-center rounded text-muted-foreground opacity-0 group-hover:opacity-100 hover:bg-border hover:text-foreground"
             >
               <ng-icon name="mynaX" size="0.7rem" />
@@ -94,7 +94,7 @@ const CONCURRENCY_CHOICES = [2, 3, 4, 6, 8] as const;
       </div>
       <button
         (click)="panels.newWorkspace()"
-        title="New tab (⌘T)"
+        [title]="'New tab (' + modLabel + 'T)'"
         class="ml-0.5 grid size-6 place-items-center rounded-md text-muted-foreground electrobun-webkit-app-region-no-drag hover:bg-accent hover:text-foreground"
       >
         <ng-icon name="mynaPlus" size=".8rem" />
@@ -359,6 +359,7 @@ export class TabBar {
   private readonly rpc = inject(RpcService);
   readonly settingsOpen = signal(false);
   readonly isMacChrome = IS_MAC_CHROME;
+  readonly modLabel = MOD_LABEL;
   readonly appName = BRANDING.appName;
   readonly buildLabel = BRANDING.buildLabel;
   readonly themes = THEMES;