fix(desktop): respect local-origin tauri shell for directory access (#391)

* feat: enable local-origin desktop features and copy in terminal support

- Enable arbitrary web loads in desktop web content for TAURI apps.
- Guard directory dialog access behind local-origin origin check.
- Add copy-to-clipboard support for terminal selections via common shortcuts.

* fix: improve initial directory resolution and persistence in directory store

packages/ui/src/components/terminal/TerminalViewport.tsx

@@ -377,6 +377,36 @@ const TerminalViewport = React.forwardRef<TerminalController, TerminalViewportPr
       }
     }, []);
 
+    const hasCopyableSelectionInViewport = React.useCallback((): boolean => {
+      if (typeof window === 'undefined') {
+        return false;
+      }
+      const selection = window.getSelection();
+      if (!selection) {
+        return false;
+      }
+      const text = selection.toString();
+      if (!text.trim()) {
+        return false;
+      }
+
+      const container = containerRef.current;
+      if (!container) {
+        return false;
+      }
+
+      const anchorNode = selection.anchorNode;
+      const focusNode = selection.focusNode;
+      if (anchorNode && !container.contains(anchorNode)) {
+        return false;
+      }
+      if (focusNode && !container.contains(focusNode)) {
+        return false;
+      }
+
+      return true;
+    }, []);
+
     const resetWriteState = React.useCallback(() => {
       pendingWriteRef.current = '';
       if (writeScheduledRef.current !== null && typeof window !== 'undefined') {
@@ -1229,6 +1259,18 @@ const TerminalViewport = React.forwardRef<TerminalController, TerminalViewportPr
     const handleHiddenKeyDown = React.useCallback(
       (event: React.KeyboardEvent<HTMLInputElement | HTMLTextAreaElement>) => {
         event.stopPropagation();
+
+        const normalizedKey = event.key.toLowerCase();
+        const isMacCopyShortcut = event.metaKey && !event.ctrlKey && !event.altKey && normalizedKey === 'c';
+        const isWindowsLinuxCopyShortcut =
+          event.ctrlKey && event.shiftKey && !event.metaKey && !event.altKey && normalizedKey === 'c';
+
+        if ((isMacCopyShortcut || isWindowsLinuxCopyShortcut) && hasCopyableSelectionInViewport()) {
+          event.preventDefault();
+          void copySelectionToClipboard();
+          return;
+        }
+
         const target = event.currentTarget as HTMLElement;
         const nativeEvent = event.nativeEvent as KeyboardEvent | undefined;
         if (nativeEvent?.isComposing) {
@@ -1272,7 +1314,7 @@ const TerminalViewport = React.forwardRef<TerminalController, TerminalViewportPr
 
         scheduleKeyProbe(target);
       },
-      [clearEditableValue, readEditableValue, scheduleKeyProbe]
+      [clearEditableValue, copySelectionToClipboard, hasCopyableSelectionInViewport, readEditableValue, scheduleKeyProbe]
     );
 
     const handleHiddenKeyUp = React.useCallback(