fix: toolbar pushed off-screen on iPad Safari with tabs

On iPad Safari with the tab bar visible, `100vh` extends behind the
browser chrome, pushing the fixed-position toolbar out of view.

- Add `viewport-fit=cover` to viewport meta tag
- Use `100dvh` with `100vh` fallback for body/.app height
- Set `--app-height` CSS variable from `visualViewport.height` via JS
- Offset fixed toolbar on iOS Safari using the layout/visual viewport delta

src/web/public/index.html

@@ -2,7 +2,7 @@
 <html lang="en">
 <head>
   <meta charset="UTF-8">
-  <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no, viewport-fit=cover">
   <meta name="description" content="Claude Code session manager with web interface">
   <meta name="theme-color" content="#0a0a0a">
   <meta name="google" content="notranslate">
@@ -25,7 +25,7 @@
   <script>if(window.innerWidth<768||(('ontouchstart' in window||navigator.maxTouchPoints>0)&&window.innerWidth<1024))document.documentElement.classList.add('mobile-init');</script>
   <!-- Inline critical CSS for instant skeleton paint (before styles.css loads) -->
   <style>
-    .loading-skeleton{display:flex;flex-direction:column;height:100vh;background:#0a0a0a}
+    .loading-skeleton{display:flex;flex-direction:column;height:100vh;height:100dvh;background:#0a0a0a}
     .skeleton-header{height:40px;background:#111;border-bottom:1px solid #1a1a2e;display:flex;align-items:center;padding:0 12px}
     .skeleton-brand{color:#60a5fa;font-size:14px;font-weight:600;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;opacity:.7}
     .skeleton-tabs{display:flex;gap:4px;margin-left:16px}

src/web/public/mobile-handlers.js

@@ -98,14 +98,33 @@ const MobileDetection = {
     }
   },
 
+  /** Set --app-height CSS variable from visual viewport.
+   *  On iPad Safari with tabs, 100vh extends behind the tab bar.
+   *  visualViewport.height reflects the actual visible area. */
+  updateAppHeight() {
+    const vh = window.visualViewport?.height || window.innerHeight;
+    document.documentElement.style.setProperty('--app-height', `${vh}px`);
+  },
+
   /** Initialize mobile detection and set up resize listener */
   init() {
     this.updateBodyClass();
+    this.updateAppHeight();
+
+    // Update --app-height on viewport resize (orientation, tab bar toggle)
+    if (window.visualViewport) {
+      this._appHeightHandler = () => this.updateAppHeight();
+      window.visualViewport.addEventListener('resize', this._appHeightHandler);
+    }
+
     // Debounced resize handler
     let resizeTimeout;
     this._resizeHandler = () => {
       clearTimeout(resizeTimeout);
-      resizeTimeout = setTimeout(() => this.updateBodyClass(), 100);
+      resizeTimeout = setTimeout(() => {
+        this.updateBodyClass();
+        this.updateAppHeight();
+      }, 100);
     };
     window.addEventListener('resize', this._resizeHandler);
 

src/web/public/mobile.css

@@ -1903,6 +1903,14 @@ html.mobile-init .file-browser-panel {
   overscroll-behavior: none;
 }
 
+/* iPad Safari with tabs: position: fixed uses the layout viewport which extends
+   behind the browser chrome (tab bar). Calculate the offset between the layout
+   viewport (innerHeight) and the visual viewport (--app-height) to push the
+   toolbar into the visible area. --app-height is set by MobileDetection.updateAppHeight(). */
+.ios-device.safari-browser .toolbar {
+  bottom: calc(var(--safe-area-bottom) + (100vh - var(--app-height, 100vh)));
+}
+
 .ios-device.safari-browser .terminal-container {
   /* Keep momentum scrolling but prevent page bounce */
   -webkit-overflow-scrolling: touch;

src/web/public/styles.css

@@ -116,6 +116,8 @@ body {
   background: var(--bg-dark);
   color: var(--text);
   height: 100vh;
+  height: 100dvh;
+  height: var(--app-height, 100dvh);
   overflow: hidden;
 }
 
@@ -124,6 +126,8 @@ body {
   display: flex;
   flex-direction: column;
   height: 100vh;
+  height: 100dvh;
+  height: var(--app-height, 100dvh);
 }
 
 /* Compact Header */
@@ -4447,6 +4451,7 @@ kbd {
   right: 0;
   width: 340px;
   height: calc(100vh - var(--header-height));
+  height: calc(100dvh - var(--header-height));
   background: var(--bg-card);
   border-left: 1px solid var(--border);
   z-index: 10001;
@@ -5815,6 +5820,7 @@ kbd {
   left: 0;
   width: 100vw;
   height: 100vh;
+  height: 100dvh;
   pointer-events: none;
   z-index: 999; /* Below windows (1000+), above panels (91) */
 }
@@ -6042,6 +6048,7 @@ kbd {
   right: 20px;
   width: 280px;
   height: calc(100vh - var(--header-height) - var(--toolbar-height) - 40px);
+  height: calc(100dvh - var(--header-height) - var(--toolbar-height) - 40px);
   max-height: 600px;
   min-width: 200px;
   min-height: 300px;