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/components/AppShell.vue

@@ -5,6 +5,7 @@ import { useSessionStore } from "../stores/session";
 import { useConfigStore } from "../stores/config";
 import { useLabelsStore } from "../stores/labels";
 import { useUiStore } from "../stores/ui";
+import CommandPalette from "./CommandPalette.vue";
 import Icon from "./Icon.vue";
 import LabelsModal from "./LabelsModal.vue";
 
@@ -17,11 +18,13 @@ const ui = useUiStore();
 
 const managing = ref(false);
 const showShortcuts = ref(false);
+const paletteOpen = ref(false);
 const searchInput = ref<HTMLInputElement | null>(null);
 const searchText = ref(typeof route.query.q === "string" ? route.query.q : "");
 let searchTimer: ReturnType<typeof setTimeout> | undefined;
 
 const shortcuts = [
+  { label: "Command palette", keys: ["⌘/Ctrl", "K"] },
   { label: "New note", keys: ["c"] },
   { label: "Search", keys: ["/"] },
   { label: "Go to Board", keys: ["g", "b"] },
@@ -57,6 +60,12 @@ function compose() {
 // typing in a field (except Esc, which blurs it). `g` starts a two-key jump
 // (g b / g g / g r) with a short timeout.
 function onKeydown(e: KeyboardEvent) {
+  // Cmd/Ctrl+K toggles the command palette — works even while typing.
+  if ((e.metaKey || e.ctrlKey) && (e.key === "k" || e.key === "K")) {
+    e.preventDefault();
+    paletteOpen.value = !paletteOpen.value;
+    return;
+  }
   if (isTyping(e)) {
     if (e.key === "Escape") (e.target as HTMLElement).blur();
     return;
@@ -238,6 +247,8 @@ async function signOut() {
 
     <LabelsModal v-if="managing" @close="managing = false" />
 
+    <CommandPalette v-if="paletteOpen" @close="paletteOpen = false" />
+
     <div
       v-if="showShortcuts"
       class="fixed inset-0 z-50 flex items-center justify-center bg-black/40 p-4"