feat: cmd+shift+delete deletes the highlighted conversation (#11)

src/lib/components/ChatView.tsx

@@ -235,6 +235,9 @@ export function ChatView({ initialSession, initialPrompt }: ChatViewProps) {
           title="Delete Conversation"
           icon={Icon.Trash}
           style="destructive"
+          // The key macOS labels "delete" is backspace. Vicinae's key map has
+          // `"backspace" -> Qt::Key_Backspace`, which it renders as the ⌫ token.
+          shortcut={{ key: "backspace", modifiers: ["cmd", "shift"] }}
           onAction={() => removeSession(row.id)}
         />
       </ActionPanel>

src/sessions.tsx

@@ -94,7 +94,8 @@ export default function SessionsCommand() {
                   title="Delete Conversation"
                   icon={Icon.Trash}
                   style="destructive"
-                  shortcut={{ key: "backspace", modifiers: ["cmd"] }}
+                  // Matches the chat view, so one shortcut means one thing across both commands.
+                  shortcut={{ key: "backspace", modifiers: ["cmd", "shift"] }}
                   onAction={() => remove(summary.id)}
                 />
                 <Action