P1: typed RPC bridge + FileSystemProvider + dual-panel local browsing

- shared/types + shared/rpc: full wire contract (Result envelope, no exceptions cross the bridge)
- FileSystemProvider interface, LocalProvider, SessionRegistry with built-in 'local'
- walk.ts: provider-generic recursive walk + removeRecursive
- rpc-handlers wired into BrowserWindow; 10min request timeout for slow SFTP ops
- Angular: RpcService (Electroview bridge + plain-browser guard), PanelsService with
  signals-based PanelState (sort/cursor/selection), FilePanel component with
  keyboard nav (arrows/Space/Enter/Backspace/Tab), path bar, toasts
- verified: both panels listDir home over the bridge in the running app

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

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

@@ -0,0 +1,106 @@
+<!-- session strip -->
+<div class="flex items-center gap-1.5 border-b border-border px-2 py-1.5">
+  <button
+    class="flex items-center gap-1.5 rounded-md px-2 py-1 text-xs font-medium hover:bg-accent"
+    title="Choose what this panel shows"
+  >
+    <ng-icon name="mynaHardDrive" class="text-muted-foreground" size="0.9rem" />
+    <span>{{ panel().title() }}</span>
+    <ng-icon name="mynaChevronDown" class="text-muted-foreground" size="0.8rem" />
+  </button>
+</div>
+
+<!-- path bar -->
+<div class="flex items-center gap-1 border-b border-border px-2 py-1.5">
+  <button
+    (click)="panel().up()"
+    title="Parent directory (Backspace)"
+    class="grid size-7 place-items-center rounded-md text-muted-foreground hover:bg-accent hover:text-foreground"
+  >
+    <ng-icon name="mynaArrowUp" size="1rem" />
+  </button>
+  <input
+    [value]="pathDraft()"
+    (input)="pathDraft.set($any($event.target).value)"
+    (keydown.enter)="commitPath()"
+    (keydown.escape)="resetPath()"
+    (keydown)="$event.stopPropagation()"
+    spellcheck="false"
+    class="h-7 min-w-0 flex-1 rounded-md border border-input bg-transparent px-2 font-mono text-xs outline-none focus:ring-2 focus:ring-ring"
+  />
+  <button
+    (click)="panel().refresh()"
+    title="Refresh"
+    class="grid size-7 place-items-center rounded-md text-muted-foreground hover:bg-accent hover:text-foreground"
+  >
+    @if (panel().loading()) {
+      <ng-icon name="mynaSpinner" size="1rem" class="animate-spin" />
+    } @else {
+      <ng-icon name="mynaRefresh" size="1rem" />
+    }
+  </button>
+</div>
+
+<!-- column headers -->
+<div
+  class="grid grid-cols-[minmax(0,1fr)_5.5rem_8.5rem] border-b border-border text-[11px] font-medium text-muted-foreground"
+>
+  <button class="px-2 py-1 text-left hover:text-foreground" (click)="panel().toggleSort('name')">
+    Name {{ sortIndicator('name') }}
+  </button>
+  <button class="px-2 py-1 text-right hover:text-foreground" (click)="panel().toggleSort('size')">
+    Size {{ sortIndicator('size') }}
+  </button>
+  <button class="px-2 py-1 text-left hover:text-foreground" (click)="panel().toggleSort('mtime')">
+    Modified {{ sortIndicator('mtime') }}
+  </button>
+</div>
+
+<!-- file list -->
+<div
+  #list
+  tabindex="0"
+  (keydown)="onKeydown($event)"
+  (mousedown)="activate()"
+  class="flex-1 overflow-y-auto outline-none"
+  [class.bg-accent]="false"
+>
+  @for (entry of panel().sorted(); track entry.name; let i = $index) {
+    <div
+      [attr.data-index]="i"
+      (click)="rowClick($event, i)"
+      (dblclick)="openAt(i)"
+      class="grid h-7 grid-cols-[minmax(0,1fr)_5.5rem_8.5rem] items-center text-[13px]"
+      [class.bg-accent]="i === panel().cursor() && !isSelected(entry)"
+      [class.bg-primary/15]="isSelected(entry)"
+      [class.ring-1]="i === panel().cursor() && isActive()"
+      [class.ring-inset]="i === panel().cursor() && isActive()"
+      [class.ring-ring]="i === panel().cursor() && isActive()"
+    >
+      <div class="flex min-w-0 items-center gap-1.5 px-2">
+        <ng-icon
+          [name]="iconFor(entry)"
+          size="0.95rem"
+          [class]="entry.type === 'dir' ? 'shrink-0 text-primary' : 'shrink-0 text-muted-foreground'"
+        />
+        <span class="truncate" [class.italic]="entry.type === 'symlink'">{{ entry.name }}</span>
+      </div>
+      <span class="px-2 text-right font-mono text-xs tabular-nums text-muted-foreground">
+        {{ entry.type === 'dir' ? '—' : formatSize(entry.size) }}
+      </span>
+      <span class="px-2 font-mono text-xs tabular-nums text-muted-foreground">
+        {{ formatDate(entry.mtime) }}
+      </span>
+    </div>
+  } @empty {
+    <div class="p-6 text-center text-xs text-muted-foreground">Empty directory</div>
+  }
+</div>
+
+<!-- footer -->
+<div class="flex items-center gap-2 border-t border-border px-2 py-1 text-[11px] text-muted-foreground">
+  <span>{{ panel().sorted().length }} items</span>
+  @if (panel().selected().size; as count) {
+    <span>· {{ count }} selected</span>
+  }
+</div>