Add a toggleable Windows 7 (7.css) skin behind a new skin setting

Evaluation branch: a full Aero skin, including frameless windows with our own
title bar, switchable against the existing modern look.

The app already had a four-axis runtime skinning mechanism and zero component
stylesheets, so the skin is one new setting plus one stylesheet section rather
than a parallel UI. The key move is cascade order: 7.css is imported into a
`skin` layer ABOVE Tailwind's `utilities`, so its bare element rules outrank
the ~1900 inline utility classes already in the templates. Template changes are
limited to additive, skin-inert hooks (ARIA roles, `has-scrollbar`,
`w7-toolbar`, `w7-btn`).

- styles.css: explicit layer order, `7.css/dist/7.scoped.css` via `layer(skin)`,
  a token bridge re-pointing the existing semantic tokens at Win7 values (no new
  tokens, so `@theme inline` is untouched), a hand-authored dark Win7 palette,
  and neutralizers that `revert-layer` 7.css's dialog-button metrics back to the
  utility layer. Neutralizers must live inside `skin`, not `skinfix` —
  `revert-layer` only reaches `utilities` from one layer up.
- Frameless chrome: `chromeOptions(skin)` is now the single place either skin's
  frame is decided. `titleBarStyle: "hidden"` on every platform, which is also
  the only way to drop the macOS traffic lights. New `title-bar` component
  mounted by all three window roots.
- Window controls over RPC (minimize/toggle-maximize/close/is-maximized), served
  per window kind so the X reuses each one's existing close path — editors still
  get their dirty prompt. electrobun has no maximize event, so the state is
  derived from `resize`; double-click-to-maximize is implemented here too.
- Font: Noto Sans vendored (OFL-1.1) under ui/src/fonts, since Segoe UI is
  absent off Windows and not redistributable.

Verified: backend `tsc --noEmit` clean, `bun run build:ui` clean (486 kB initial,
under the 500 kB budget), app launches with the skin active and no console
errors. The rendered result has not been eyeballed — screen capture and
accessibility are both denied to the shell on this machine.

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

ui/src/app/app.html

@@ -10,6 +10,8 @@
       </div>
     </div>
   } @else {
+    <!-- win7 skin only: the window is frameless, so this IS the chrome -->
+    <app-title-bar [title]="appName" (closeRequested)="closeWindow()" />
     <app-tab-bar />
 
     <main class="flex min-h-0 flex-1 divide-x divide-border">

ui/src/app/app.ts

@@ -17,6 +17,7 @@ import { RpcService } from './rpc.service';
 import { SettingsService } from './settings.service';
 import { StatusBar } from './status-bar/status-bar';
 import { TabBar } from './tab-bar/tab-bar';
+import { TitleBar } from './title-bar/title-bar';
 import { ToastService } from './toast.service';
 import { Toasts } from './toasts/toasts';
 import { TransferBar } from './transfer-bar/transfer-bar';
@@ -36,6 +37,7 @@ import { UpdaterService } from './updater.service';
     OverwriteDialog,
     Toasts,
     TransferBar,
+    TitleBar,
   ],
   templateUrl: './app.html',
   host: {
@@ -58,6 +60,18 @@ export class App {
   /** The connection-manager window is open — this window is modal-blocked. */
   readonly managerOpen = signal(false);
 
+  /** Shown in the win7 title bar (no native titlebar to carry it). */
+  readonly appName = BRANDING.appName;
+
+  /**
+   * win7 title bar's X. Closing the main window quits, and the app-level
+   * before-quit guard (dirty editors + running transfers) still runs — it is
+   * the one close path electrobun lets us cancel.
+   */
+  closeWindow(): void {
+    void this.rpc.request.windowClose({});
+  }
+
   constructor() {
     document.title = BRANDING.appName;
     if (this.rpc.available) {

ui/src/app/connection-manager/connection-manager.html

@@ -1,8 +1,14 @@
 <div class="flex h-screen flex-col bg-background text-foreground">
+  <!-- win7 skin only: frameless window. Fixed-size modal, so Close only. -->
+  <app-title-bar
+    [title]="i18n.t('connMgr.title')"
+    [resizable]="false"
+    (closeRequested)="close()"
+  />
   <!-- header: on macOS this row IS the titlebar (hiddenInset + drag region),
        elsewhere the native titlebar sits above and this is a compact strip -->
   <header
-    class="flex shrink-0 items-center gap-2 border-b border-border bg-chrome pr-2"
+    class="w7-toolbar flex shrink-0 items-center gap-2 border-b border-border bg-chrome pr-2"
     [class.h-10]="isMacChrome"
     [class.pl-24]="isMacChrome"
     [class.electrobun-webkit-app-region-drag]="isMacChrome"
@@ -47,7 +53,7 @@
           </button>
         </div>
 
-        <div class="flex-1 overflow-y-auto py-1">
+        <div class="has-scrollbar flex-1 overflow-y-auto py-1">
           <!-- stacks -->
           @for (group of store.grouped().stacks; track group.stack.id) {
             <div
@@ -175,7 +181,7 @@
       <!-- edit form -->
       <div class="flex min-w-0 flex-1 flex-col">
         @if (draft(); as d) {
-          <div class="grid flex-1 auto-rows-min grid-cols-2 gap-x-4 gap-y-3 overflow-y-auto p-5">
+          <div class="has-scrollbar grid flex-1 auto-rows-min grid-cols-2 gap-x-4 gap-y-3 overflow-y-auto p-5">
             <label class="col-span-2 flex flex-col gap-1 text-xs">
               <span class="text-muted-foreground">{{ i18n.t('connMgr.name') }}</span>
               <input

ui/src/app/connection-manager/connection-manager.ts

@@ -9,6 +9,7 @@ import { DialogsService } from '../dialogs.service';
 import { blockNativeContextMenu, IS_MAC_CHROME } from '../platform';
 import { RpcService } from '../rpc.service';
 import { SettingsService } from '../settings.service';
+import { TitleBar } from '../title-bar/title-bar';
 import { Toasts } from '../toasts/toasts';
 
 interface Draft {
@@ -72,7 +73,7 @@ function fromDraft(d: Draft): SavedConnection {
  */
 @Component({
   selector: 'app-root',
-  imports: [NgIcon, ConfirmDialog, PromptDialog, Toasts],
+  imports: [NgIcon, ConfirmDialog, PromptDialog, Toasts, TitleBar],
   templateUrl: './connection-manager.html',
   host: {
     '(window:keydown.escape)': 'onEscape()',

ui/src/app/dialogs/chmod-dialog.ts

@@ -60,13 +60,13 @@ const PERMS = ['r', 'w', 'x'] as const;
         <div class="mt-4 flex justify-end gap-2">
           <button
             (click)="cancel()"
-            class="rounded-md px-3 py-1.5 text-xs font-medium hover:bg-accent"
+            class="w7-btn rounded-md px-3 py-1.5 text-xs font-medium hover:bg-accent"
           >
             {{ i18n.t('common.cancel') }}
           </button>
           <button
             (click)="submit()"
-            class="rounded-md bg-primary px-3 py-1.5 text-xs font-medium text-primary-foreground hover:bg-primary/90"
+            class="w7-btn rounded-md bg-primary px-3 py-1.5 text-xs font-medium text-primary-foreground hover:bg-primary/90"
           >
             {{ i18n.t('common.apply') }}
           </button>

ui/src/app/dialogs/confirm-dialog.ts

@@ -17,7 +17,7 @@ import { FocusService } from '../focus.service';
         <div class="mt-4 flex justify-end gap-2">
           <button
             (click)="cancel()"
-            class="rounded-md px-3 py-1.5 text-xs font-medium hover:bg-accent"
+            class="w7-btn rounded-md px-3 py-1.5 text-xs font-medium hover:bg-accent"
           >
             {{ i18n.t('common.cancel') }}
           </button>
@@ -26,8 +26,8 @@ import { FocusService } from '../focus.service';
             (click)="submit()"
             [class]="
               request().destructive
-                ? 'rounded-md bg-destructive px-3 py-1.5 text-xs font-medium text-destructive-foreground hover:bg-destructive/90'
-                : 'rounded-md bg-primary px-3 py-1.5 text-xs font-medium text-primary-foreground hover:bg-primary/90'
+                ? 'w7-btn rounded-md bg-destructive px-3 py-1.5 text-xs font-medium text-destructive-foreground hover:bg-destructive/90'
+                : 'w7-btn rounded-md bg-primary px-3 py-1.5 text-xs font-medium text-primary-foreground hover:bg-primary/90'
             "
           >
             {{ request().confirmLabel }}

ui/src/app/dialogs/overwrite-dialog.ts

@@ -79,7 +79,7 @@ import { FocusService } from '../focus.service';
         <div class="mt-4 flex items-center gap-2">
           <button
             (click)="pick('cancel')"
-            class="rounded-md px-3 py-1.5 text-xs font-medium text-muted-foreground hover:bg-accent hover:text-foreground"
+            class="w7-btn rounded-md px-3 py-1.5 text-xs font-medium text-muted-foreground hover:bg-accent hover:text-foreground"
           >
             {{ i18n.t('common.cancel') }}
           </button>
@@ -101,14 +101,14 @@ import { FocusService } from '../focus.service';
           }
           <button
             (click)="pick('skip')"
-            class="rounded-md px-3 py-1.5 text-xs font-medium hover:bg-accent"
+            class="w7-btn rounded-md px-3 py-1.5 text-xs font-medium hover:bg-accent"
           >
             {{ i18n.t('dialogs.skip') }}
           </button>
           <button
             #primaryBtn
             (click)="pick('overwrite')"
-            class="rounded-md bg-primary px-3 py-1.5 text-xs font-medium text-primary-foreground hover:bg-primary/90"
+            class="w7-btn rounded-md bg-primary px-3 py-1.5 text-xs font-medium text-primary-foreground hover:bg-primary/90"
           >
             {{ isDir() ? i18n.t('dialogs.merge') : i18n.t('dialogs.replace') }}
           </button>

ui/src/app/dialogs/prompt-dialog.ts

@@ -33,14 +33,14 @@ import { FocusService } from '../focus.service';
         <div class="mt-4 flex justify-end gap-2">
           <button
             (click)="cancel()"
-            class="rounded-md px-3 py-1.5 text-xs font-medium hover:bg-accent"
+            class="w7-btn rounded-md px-3 py-1.5 text-xs font-medium hover:bg-accent"
           >
             {{ i18n.t('common.cancel') }}
           </button>
           <button
             (click)="submit()"
             [disabled]="!value().trim()"
-            class="rounded-md bg-primary px-3 py-1.5 text-xs font-medium text-primary-foreground hover:bg-primary/90 disabled:opacity-50"
+            class="w7-btn rounded-md bg-primary px-3 py-1.5 text-xs font-medium text-primary-foreground hover:bg-primary/90 disabled:opacity-50"
           >
             {{ request().confirmLabel }}
           </button>

ui/src/app/editor-window/editor-window.html

@@ -10,10 +10,13 @@
       </div>
     </div>
   } @else {
+    <!-- win7 skin only: the window is frameless. The X runs the SAME dirty
+         prompt as ⌘W and the Close button — never a raw window close. -->
+    <app-title-bar [title]="ctx.name + (dirty() ? ' *' : '')" (closeRequested)="requestClose()" />
     <!-- header: on macOS this row IS the titlebar (hiddenInset + drag region),
          elsewhere the native titlebar sits above and this is a compact strip -->
     <header
-      class="flex shrink-0 items-center gap-2 border-b border-border bg-chrome pr-2"
+      class="w7-toolbar flex shrink-0 items-center gap-2 border-b border-border bg-chrome pr-2"
       [class.h-10]="isMacChrome"
       [class.pl-24]="isMacChrome"
       [class.electrobun-webkit-app-region-drag]="isMacChrome"

ui/src/app/editor-window/editor-window.ts

@@ -15,6 +15,7 @@ import { ALT_LABEL, blockNativeContextMenu, EDITOR_CONTEXT, IS_MAC_CHROME, MOD_L
 import { RpcService } from '../rpc.service';
 import { SettingsService } from '../settings.service';
 import { ToastService } from '../toast.service';
+import { TitleBar } from '../title-bar/title-bar';
 import { Toasts } from '../toasts/toasts';
 
 /** Debounce for mirroring the draft to bun (the traffic-light-close safety net). */
@@ -30,7 +31,7 @@ const DRAFT_DEBOUNCE_MS = 400;
  */
 @Component({
   selector: 'app-root',
-  imports: [NgIcon, Toasts],
+  imports: [NgIcon, Toasts, TitleBar],
   templateUrl: './editor-window.html',
   host: {
     '(window:keydown)': 'onKeydown($event)',

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

@@ -84,7 +84,7 @@
   @if (menuOpen()) {
     <div class="fixed inset-0 z-20" (click)="menuOpen.set(false)"></div>
     <div
-      class="absolute top-full left-2 z-30 mt-1 max-h-80 w-64 overflow-y-auto rounded-lg border border-border bg-card py-1 text-card-foreground shadow-xl"
+      class="has-scrollbar absolute top-full left-2 z-30 mt-1 max-h-80 w-64 overflow-y-auto rounded-lg border border-border bg-card py-1 text-card-foreground shadow-xl"
     >
       <button
         (click)="pickLocal()"
@@ -238,7 +238,7 @@
   (keydown)="onKeydown($event)"
   (mousedown)="activate()"
   (contextmenu)="listContextMenu($event)"
-  class="h-full overflow-y-auto outline-none"
+  class="has-scrollbar h-full overflow-y-auto outline-none"
 >
   @if (panel().connecting()) {
     <div class="panel-fade-in grid h-full place-items-center">

ui/src/app/platform.ts

@@ -8,6 +8,9 @@ declare global {
     __APP_PLATFORM?: string;
     /** Which root component this window boots. */
     __APP_MODE?: 'main' | 'editor' | 'manager';
+    /** Persisted skin — decides the window's native chrome, so it has to be
+     *  known before first paint (see chromeOptions in src/bun/windows.ts). */
+    __APP_SKIN?: 'modern' | 'win7';
     /** Window-kind specific context (EditorOpenContext for editor windows). */
     __APP_CTX?: unknown;
   }
@@ -15,14 +18,32 @@ declare global {
 
 export const PLATFORM = typeof window !== 'undefined' ? (window.__APP_PLATFORM ?? '') : '';
 
-/** True when the window uses macOS hiddenInset chrome (header fused with titlebar). */
-export const IS_MAC_CHROME = PLATFORM === 'darwin';
+const IS_MAC = PLATFORM === 'darwin';
+
+/**
+ * The win7 skin makes the window frameless on EVERY platform and draws its own
+ * Aero title bar, so this is a window-chrome fact, not just a settings value —
+ * it is baked into the preload rather than read from SettingsService, which
+ * resolves too late for layout. Toggling the setting only affects windows
+ * opened afterwards.
+ */
+export const IS_WIN7_CHROME =
+  typeof window !== 'undefined' && window.__APP_SKIN === 'win7';
+
+/**
+ * True when macOS traffic lights overlay the app's header row (the fused
+ * hiddenInset layout, which reserves pl-24 for them). False under the win7
+ * skin even on macOS: titleBarStyle 'hidden' removes the traffic lights, so
+ * reserving space for them would leave a gap.
+ */
+export const IS_MAC_CHROME = IS_MAC && !IS_WIN7_CHROME;
 
 export const IS_WINDOWS = PLATFORM === 'win32';
 
-/** Shortcut-hint labels: "⌘W" on macOS, "Ctrl+W" elsewhere. */
-export const MOD_LABEL = IS_MAC_CHROME ? '⌘' : 'Ctrl+';
-export const ALT_LABEL = IS_MAC_CHROME ? '⌥' : 'Alt+';
+/** Shortcut-hint labels: "⌘W" on macOS, "Ctrl+W" elsewhere. Keyed on the real
+ *  platform, NOT IS_MAC_CHROME — the keyboard does not change with the skin. */
+export const MOD_LABEL = IS_MAC ? '⌘' : 'Ctrl+';
+export const ALT_LABEL = IS_MAC ? '⌥' : 'Alt+';
 
 export const APP_MODE: 'main' | 'editor' | 'manager' =
   typeof window !== 'undefined' ? (window.__APP_MODE ?? 'main') : 'main';

ui/src/app/rpc.service.ts

@@ -32,6 +32,7 @@ export class RpcService {
   private managerStateListeners = new Set<(open: boolean) => void>();
   private connectionsListeners = new Set<() => void>();
   private updateStatusListeners = new Set<(status: UpdateStatus) => void>();
+  private windowStateListeners = new Set<(maximized: boolean) => void>();
 
   private rpc: ReturnType<typeof Electroview.defineRPC<AppRPC>> | undefined;
   private ready: Promise<void> = Promise.resolve();
@@ -71,6 +72,9 @@ export class RpcService {
           updateStatus: (status) => {
             for (const listener of this.updateStatusListeners) listener(status);
           },
+          windowState: ({ maximized }) => {
+            for (const listener of this.windowStateListeners) listener(maximized);
+          },
         },
       },
     });
@@ -123,6 +127,12 @@ export class RpcService {
     this.updateStatusListeners.add(listener);
   }
 
+  /** win7 skin: the frameless window's maximize state changed (derived from
+   *  the native resize event, so Aero Snap and Win+Up land here too). */
+  onWindowState(listener: (maximized: boolean) => void): void {
+    this.windowStateListeners.add(listener);
+  }
+
   /** Typed request proxy: `await rpc.request.listDir({...})`. Waits for the bridge. */
   get request() {
     const rpc = this.rpc;

ui/src/app/settings.service.ts

@@ -7,6 +7,7 @@ import { RpcService } from './rpc.service';
 @Injectable({ providedIn: 'root' })
 export class SettingsService {
   readonly locale = signal<AppSettings['locale']>(DEFAULT_SETTINGS.locale);
+  readonly skin = signal<AppSettings['skin']>(DEFAULT_SETTINGS.skin);
   readonly theme = signal<AppSettings['theme']>(DEFAULT_SETTINGS.theme);
   readonly darkTone = signal<AppSettings['darkTone']>(DEFAULT_SETTINGS.darkTone);
   readonly accent = signal<AppSettings['accent']>(DEFAULT_SETTINGS.accent);
@@ -40,6 +41,7 @@ export class SettingsService {
       .addEventListener('change', (e) => this.systemDark.set(e.matches));
     // the default accent is not the CSS default — apply before first paint
     this.applyAccent();
+    this.applySkin();
     if (!this.rpc.available) return;
     void this.rpc.request.getSettings({}).then((res) => {
       if (res.ok) this.applyAll(res.settings);
@@ -50,6 +52,7 @@ export class SettingsService {
 
   private applyAll(settings: AppSettings): void {
     this.locale.set(settings.locale);
+    this.skin.set(settings.skin);
     this.theme.set(settings.theme);
     this.darkTone.set(settings.darkTone);
     this.accent.set(settings.accent);
@@ -62,6 +65,7 @@ export class SettingsService {
     this.autoClearCompleted.set(settings.autoClearCompleted);
     this.editor.set(settings.editor);
     this.editorApp.set(settings.editorApp);
+    this.applySkin();
     this.applyTheme();
     this.applyDarkTone();
     this.applyAccent();
@@ -75,6 +79,12 @@ export class SettingsService {
     void this.persist();
   }
 
+  setSkin(skin: AppSettings['skin']): void {
+    this.skin.set(skin);
+    this.applySkin();
+    void this.persist();
+  }
+
   setTheme(theme: AppSettings['theme']): void {
     this.theme.set(theme);
     this.applyTheme();
@@ -142,6 +152,16 @@ export class SettingsService {
     void this.persist();
   }
 
+  /**
+   * The odd one out: a CLASS, not a data-* attribute. 7.scoped.css is
+   * precompiled to require a literal `.win7` ancestor, so the class is not
+   * ours to choose. Default ("modern") = class absent, matching the
+   * delete-when-default rule the other axes follow.
+   */
+  private applySkin(): void {
+    document.documentElement.classList.toggle('win7', this.skin() === 'win7');
+  }
+
   private applyTheme(): void {
     const theme = this.theme();
     if (theme === 'system') {
@@ -185,6 +205,7 @@ export class SettingsService {
   protected settings(): AppSettings {
     return {
       locale: this.locale(),
+      skin: this.skin(),
       theme: this.theme(),
       darkTone: this.darkTone(),
       accent: this.accent(),

ui/src/app/tab-bar/tab-bar.ts

@@ -5,11 +5,12 @@ import { LOCALE_LABELS, SUPPORTED } from '@shared/i18n';
 import type { AccentTone } from '@shared/types';
 import { I18nService } from '../i18n.service';
 import { PanelsService } from '../panels.service';
-import { IS_MAC_CHROME, MOD_LABEL } from '../platform';
+import { IS_MAC_CHROME, IS_WIN7_CHROME, MOD_LABEL } from '../platform';
 import { RpcService } from '../rpc.service';
 import { SettingsService } from '../settings.service';
 import { UpdaterService } from '../updater.service';
 
+const SKINS = ['modern', 'win7'] as const;
 const THEMES = ['system', 'light', 'dark'] as const;
 const DARK_TONES = ['dark', 'darker'] as const;
 // Swatch colors are fixed mid-tones so every dot reads on both light and dark
@@ -41,7 +42,7 @@ const CONCURRENCY_CHOICES = [2, 3, 4, 6, 8] as const;
     <!-- On macOS this row IS the titlebar (hiddenInset): taller, padded past the
          traffic lights, and draggable. Elsewhere it's a normal compact row. -->
     <div
-      class="relative flex items-center gap-0.5 border-b border-border bg-chrome pr-1.5 electrobun-webkit-app-region-drag"
+      class="w7-toolbar relative flex items-center gap-0.5 border-b border-border bg-chrome pr-1.5 electrobun-webkit-app-region-drag"
       [class.h-10]="isMacChrome"
       [class.pl-24]="isMacChrome"
       [class.pl-1.5]="!isMacChrome"
@@ -180,6 +181,30 @@ const CONCURRENCY_CHOICES = [2, 3, 4, 6, 8] as const;
             </select>
           </div>
 
+          <div class="mt-2.5 flex items-center justify-between gap-2">
+            <span class="text-xs text-muted-foreground">{{ i18n.t('options.skin.label') }}</span>
+            <div class="flex rounded-md border border-border p-0.5">
+              @for (option of skins; track option) {
+                <button
+                  (click)="settings.setSkin(option)"
+                  class="rounded px-2 py-0.5 text-[11px]"
+                  [class.bg-accent]="settings.skin() === option"
+                  [class.text-foreground]="settings.skin() === option"
+                  [class.text-muted-foreground]="settings.skin() !== option"
+                >
+                  {{ i18n.t('options.skin.' + option) }}
+                </button>
+              }
+            </div>
+          </div>
+          <!-- The CSS half of the skin flips live; the window frame does not
+               (titleBarStyle is fixed at construction — see chromeOptions). -->
+          @if (settings.skin() !== bootSkin) {
+            <p class="mt-1 text-right text-[10px] text-muted-foreground">
+              {{ i18n.t('options.skin.restartHint') }}
+            </p>
+          }
+
           <div class="mt-2.5 flex items-center justify-between gap-2">
             <span class="text-xs text-muted-foreground">{{ i18n.t('options.theme.label') }}</span>
             <div class="flex rounded-md border border-border p-0.5">
@@ -436,6 +461,10 @@ export class TabBar {
   readonly modLabel = MOD_LABEL;
   readonly appName = BRANDING.appName;
   readonly buildLabel = BRANDING.buildLabel;
+  readonly skins = SKINS;
+  /** What the window was BUILT with, not the current setting — the frameless
+   *  chrome only changes on reopen, so the hint compares against this. */
+  readonly bootSkin: (typeof SKINS)[number] = IS_WIN7_CHROME ? 'win7' : 'modern';
   readonly themes = THEMES;
   readonly darkTones = DARK_TONES;
   readonly accents = ACCENTS;

ui/src/app/title-bar/title-bar.ts

@@ -0,0 +1,72 @@
+import { Component, inject, input, output, signal } from '@angular/core';
+import { IS_WIN7_CHROME } from '../platform';
+import { RpcService } from '../rpc.service';
+
+/**
+ * The win7 skin's Aero title bar. Rendered by all three window kinds, and only
+ * when `IS_WIN7_CHROME` — under that skin the native frame is gone
+ * (titleBarStyle 'hidden'), so this row IS the window's chrome.
+ *
+ * The markup is 7.css's contract, not ours: `.title-bar` > `.title-bar-text` +
+ * `.title-bar-controls` > buttons keyed by `aria-label` (Minimize / Maximize /
+ * Restore / Close each get their own glyph). Nothing here is styled with
+ * Tailwind on purpose — the whole row comes from @layer skin.
+ *
+ * Dragging rides on electrobun's preload drag-region classes. Two things
+ * electrobun does NOT provide and this component implements:
+ *   - double-click to maximize (it only wires mousedown/mouseup)
+ *   - the maximize/restore glyph state, which has no event; bun derives it
+ *     from the native resize and pushes `windowState` (see trackMaximizeState).
+ */
+@Component({
+  selector: 'app-title-bar',
+  template: `
+    @if (enabled) {
+      <div class="title-bar electrobun-webkit-app-region-drag" (dblclick)="toggle()">
+        <div class="title-bar-text">{{ title() }}</div>
+        <div class="title-bar-controls electrobun-webkit-app-region-no-drag">
+          @if (resizable()) {
+            <button aria-label="Minimize" (click)="minimize()"></button>
+            <button
+              [attr.aria-label]="maximized() ? 'Restore' : 'Maximize'"
+              (click)="toggle()"
+            ></button>
+          }
+          <button aria-label="Close" (click)="closeRequested.emit()"></button>
+        </div>
+      </div>
+    }
+  `,
+})
+export class TitleBar {
+  readonly title = input('');
+  /** The manager window is a fixed-size modal — it gets Close only. */
+  readonly resizable = input(true);
+  /** Hosts decide what closing means (quit / dirty prompt / managerClose). */
+  readonly closeRequested = output<void>();
+
+  protected readonly enabled = IS_WIN7_CHROME;
+  protected readonly maximized = signal(false);
+
+  private readonly rpc = inject(RpcService);
+
+  constructor() {
+    if (!this.enabled || !this.rpc.available) return;
+    // No maximize event exists, so seed from a one-shot read and then follow
+    // the resize-derived push (which also covers Aero Snap and Win+Up).
+    void this.rpc.request.windowIsMaximized({}).then((res) => {
+      if (res.ok) this.maximized.set(res.maximized);
+    });
+    this.rpc.onWindowState((maximized) => this.maximized.set(maximized));
+  }
+
+  protected minimize(): void {
+    void this.rpc.request.windowMinimize({});
+  }
+
+  protected toggle(): void {
+    void this.rpc.request.windowToggleMaximize({}).then((res) => {
+      if (res.ok) this.maximized.set(res.maximized);
+    });
+  }
+}

ui/src/app/transfer-bar/transfer-bar.html

@@ -11,7 +11,7 @@
       <ng-icon name="mynaTrash" size="0.75rem" /> {{ i18n.t('transfer.clearFinished') }}
     </button>
   </div>
-  <div class="max-h-40 overflow-y-auto border-t border-border bg-chrome">
+  <div class="has-scrollbar max-h-40 overflow-y-auto border-t border-border bg-chrome">
     @for (job of transfers.jobs(); track job.id) {
       <div class="flex items-center gap-2 px-3 py-1.5 text-xs">
         <ng-icon [name]="stateIcon(job)" size="0.95rem" [class]="stateClass(job)" />
@@ -19,7 +19,16 @@
         <div class="min-w-0 flex-1">
           <div class="truncate text-[11px] text-muted-foreground">{{ progressLabel(job) }}</div>
           @if (isActive(job)) {
-            <div class="mt-0.5 h-1 overflow-hidden rounded-full bg-muted">
+            <!-- role+aria are 7.css's hook for the Win7 progress bar
+                 ([role=progressbar] > div); under the modern skin they are
+                 inert and the Tailwind classes below still draw the bar. -->
+            <div
+              role="progressbar"
+              aria-valuemin="0"
+              aria-valuemax="100"
+              [attr.aria-valuenow]="jobPercent(job)"
+              class="mt-0.5 h-1 overflow-hidden rounded-full bg-muted"
+            >
               <div
                 class="h-full rounded-full bg-primary transition-[width] duration-100"
                 [style.width.%]="jobPercent(job)"