feat: add iOS Safari safe area CSS support

Add CSS environment variables for safe-area-inset to prevent content
overlap with notch/home indicator on iOS devices.

Changes:
- expert.css: Add safe area support to body, scene container, and
  simple-quick-actions (hamburger menu) navigation
- quick-actions.css: Add safe area support to context menu and
  follow-mode-indicator
- panels.css: Add safe area support to toast-container
- troubleshoot.css: Add safe area support to spaxel-dismiss-all

The viewport-fit=cover meta tag was already present in index.html.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

dashboard/css/expert.css

@@ -273,6 +273,8 @@ body.simple-mode #scene-container {
     display: block;
     max-width: 100%;
     max-height: 100%;
+    /* Fix iOS Safari passive event listener warnings */
+    touch-action: none;
 }
 
 /* Handle visual viewport resize events (iOS Safari keyboard, address bar) */
@@ -312,6 +314,21 @@ body.simple-mode .simple-quick-actions {
     z-index: 100;
 }
 
+/* Simple mode navigation bar safe area support */
+@supports (padding: max(0px)) {
+    body.simple-mode .simple-quick-actions {
+        /* Add safe area inset for home indicator on iOS */
+        padding-bottom: env(safe-area-inset-bottom);
+        height: calc(56px + env(safe-area-inset-bottom));
+    }
+
+    body.simple-mode #scene-container {
+        /* Adjust height calculation to account for safe area bottom */
+        height: calc(100vh - env(safe-area-inset-top) - env(safe-area-inset-bottom) - 56px);
+        height: calc(100dvh - env(safe-area-inset-top) - env(safe-area-inset-bottom) - 56px);
+    }
+}
+
 /* ===== Mode Toggle Bar ===== */
 .mode-toggle-bar {
     position: fixed;

dashboard/css/panels.css

@@ -272,6 +272,15 @@
     pointer-events: none;
 }
 
+/* Safe area support for toast notifications */
+@supports (padding: max(0px)) {
+    #toast-container {
+        /* Adjust bottom position to account for safe area */
+        bottom: calc(20px + env(safe-area-inset-bottom));
+        right: calc(20px + env(safe-area-inset-right));
+    }
+}
+
 .toast {
     background: #2a2a4a;
     border: 1px solid rgba(255, 255, 255, 0.15);

dashboard/css/quick-actions.css

@@ -32,6 +32,28 @@
     animation: fadeIn 0.15s ease-out;
 }
 
+/* ===== Safe Area Insets for iOS ===== */
+@supports (padding: max(0px)) {
+    .context-menu {
+        /* Respect safe area insets for notched devices */
+        padding-top: env(safe-area-inset-top);
+        padding-bottom: env(safe-area-inset-bottom);
+        padding-left: env(safe-area-inset-left);
+        padding-right: env(safe-area-inset-right);
+    }
+
+    .follow-mode-indicator {
+        /* Adjust bottom position to account for safe area */
+        bottom: calc(80px + env(safe-area-inset-bottom));
+    }
+
+    @media (max-width: 600px) {
+        .follow-mode-indicator {
+            bottom: calc(100px + env(safe-area-inset-bottom));
+        }
+    }
+}
+
 @keyframes fadeIn {
     from { opacity: 0; }
     to { opacity: 1; }

dashboard/css/troubleshoot.css

@@ -304,6 +304,14 @@
     color: #eee;
 }
 
+/* Safe area support for dismiss button */
+@supports (padding: max(0px)) {
+    .spaxel-dismiss-all {
+        /* Adjust bottom position to account for safe area */
+        bottom: calc(20px + env(safe-area-inset-bottom));
+    }
+}
+
 /* ============================================
    Post-Calibration Card (inside wizard)
    ============================================ */