keyboard: command palette (Cmd/Ctrl+K)

Fuzzy quick-open overlay: type to jump to any note by title (titles index)
or run a command — New note, Go to Board/Graph/Reminders/Archive/Trash, and
Open Settings (admins). Arrow keys move the selection, Enter activates, Esc
closes; Cmd/Ctrl+K toggles it (works even while typing).

Selecting a note navigates to the board with ?open=<id>; BoardView watches
that query and opens the editor (fetching the note if it isn't loaded), then
clears the param. Added to the ? cheat-sheet.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FRgehjoz7Yv8LkUfADxACm

frontend/src/views/BoardView.vue

@@ -1,6 +1,6 @@
 <script setup lang="ts">
 import { computed, onMounted, ref, watch } from "vue";
-import { useRoute } from "vue-router";
+import { useRoute, useRouter } from "vue-router";
 import { useNotesStore, type Note, type NoteView } from "../stores/notes";
 import { useUiStore } from "../stores/ui";
 import QuickAdd from "../components/QuickAdd.vue";
@@ -10,6 +10,7 @@ import NoteEditor from "../components/NoteEditor.vue";
 const notes = useNotesStore();
 const route = useRoute();
 const ui = useUiStore();
+const router = useRouter();
 
 const editing = ref<Note | null>(null);
 const quickAdd = ref<InstanceType<typeof QuickAdd> | null>(null);
@@ -21,6 +22,22 @@ watch(
   () => quickAdd.value?.open(),
 );
 
+// The command palette opens a note by navigating here with ?open=<id>.
+watch(
+  () => route.query.open,
+  (v) => {
+    if (typeof v === "string" && v) void openFromQuery(v);
+  },
+  { immediate: true },
+);
+async function openFromQuery(id: string) {
+  const found = notes.items.find((n) => n.id === id) ?? (await notes.fetchOne(id));
+  if (found) editing.value = found;
+  const q = { ...route.query };
+  delete q.open;
+  void router.replace({ query: q });
+}
+
 function viewForRoute(name: unknown): NoteView {
   if (name === "archive") return "archived";
   if (name === "trash") return "trash";