'..' parent row in the file list

Synthetic cursor-navigable first row (hidden at /) — Enter/double-click goes to
the parent like the toolbar button. Excluded from selection, rename, delete,
chmod, and transfers; shown with an up-arrow icon.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

ui/src/app/panels.service.ts

@@ -23,7 +23,7 @@ export class PanelState {
   readonly cursor = signal(0);
   readonly selected = signal<ReadonlySet<string>>(new Set());
 
-  /** Directories first, then the active sort column. */
+  /** Directories first, then the active sort column. ".." (parent) is pinned on top. */
   readonly sorted = computed(() => {
     const list = [...this.entries()];
     const key = this.sortKey();
@@ -41,6 +41,10 @@ export class PanelState {
       }
       return cmp * dir;
     });
+    const cwd = this.cwd();
+    if (cwd && cwd !== '/') {
+      list.unshift({ name: '..', path: `${cwd}/..`, type: 'dir', size: 0, mtime: 0, mode: 0 });
+    }
     return list;
   });
 
@@ -120,6 +124,7 @@ export class PanelState {
   }
 
   toggleSelect(name: string): void {
+    if (name === '..') return;
     this.selected.update((prev) => {
       const next = new Set(prev);
       if (next.has(name)) next.delete(name);
@@ -132,12 +137,13 @@ export class PanelState {
     const [lo, hi] = fromIndex <= toIndex ? [fromIndex, toIndex] : [toIndex, fromIndex];
     const names = this.sorted()
       .slice(lo, hi + 1)
-      .map((e) => e.name);
+      .map((e) => e.name)
+      .filter((n) => n !== '..');
     this.selected.update((prev) => new Set([...prev, ...names]));
   }
 
   selectAll(): void {
-    this.selected.set(new Set(this.sorted().map((e) => e.name)));
+    this.selected.set(new Set(this.sorted().map((e) => e.name).filter((n) => n !== '..')));
   }
 
   clearSelection(): void {