ui: capture polish — auto-grow quick-add + per-card color popover

QuickAdd body textarea auto-grows to fit content (min ~3 rows, capped with
scroll) instead of a fixed 3 rows. NoteCard's hover toolbar gains a color
dot that opens a swatch popover to recolor the note in place (outside-click
closes it; listener attached only while open).

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

frontend/src/components/NoteCard.vue

@@ -1,7 +1,14 @@
 <script setup lang="ts">
-import { ref, watch } from "vue";
+import { onBeforeUnmount, ref, watch } from "vue";
 import { useNotesStore } from "../stores/notes";
-import { LABEL_CHIP_CLASSES, NOTE_CARD_CLASSES, type NoteColor } from "../notes/colors";
+import {
+  LABEL_CHIP_CLASSES,
+  NOTE_CARD_CLASSES,
+  NOTE_COLOR_KEYS,
+  NOTE_COLOR_LABELS,
+  NOTE_SWATCH_CLASSES,
+  type NoteColor,
+} from "../notes/colors";
 import type { Note } from "../stores/notes";
 import Icon from "./Icon.vue";
 import LinkedText from "./LinkedText.vue";
@@ -32,6 +39,28 @@ function cardClass(color: NoteColor): string {
 function labelChip(color: string): string {
   return LABEL_CHIP_CLASSES[color as NoteColor] ?? LABEL_CHIP_CLASSES.default;
 }
+
+// Per-card color popover (recolor without opening the editor).
+const colorOpen = ref(false);
+
+function swatch(color: string): string {
+  return NOTE_SWATCH_CLASSES[color as NoteColor] ?? NOTE_SWATCH_CLASSES.default;
+}
+
+function pickColor(color: NoteColor) {
+  colorOpen.value = false;
+  void notes.setColor(props.note.id, color);
+}
+
+function onDocMousedown(e: MouseEvent) {
+  if (colorOpen.value && root.value && !root.value.contains(e.target as Node)) colorOpen.value = false;
+}
+// Only listen for outside clicks while the popover is actually open.
+watch(colorOpen, (open) => {
+  if (open) document.addEventListener("mousedown", onDocMousedown);
+  else document.removeEventListener("mousedown", onDocMousedown);
+});
+onBeforeUnmount(() => document.removeEventListener("mousedown", onDocMousedown));
 </script>
 
 <template>
@@ -143,6 +172,18 @@ function labelChip(color: string): string {
         </button>
       </template>
       <template v-else>
+        <button
+          type="button"
+          class="icon-btn"
+          title="Change color"
+          aria-label="Change color"
+          @click.stop="colorOpen = !colorOpen"
+        >
+          <span
+            class="h-4 w-4 rounded-full border border-black/10 dark:border-white/20"
+            :class="swatch(note.color)"
+          ></span>
+        </button>
         <button
           type="button"
           class="icon-btn"
@@ -174,5 +215,21 @@ function labelChip(color: string): string {
         </button>
       </template>
     </div>
+
+    <div
+      v-if="colorOpen"
+      class="absolute right-1.5 top-11 z-20 flex w-40 flex-wrap gap-1.5 rounded-lg border border-neutral-200 bg-white p-2 shadow-lg dark:border-neutral-700 dark:bg-neutral-800"
+    >
+      <button
+        v-for="key in NOTE_COLOR_KEYS"
+        :key="key"
+        type="button"
+        :title="NOTE_COLOR_LABELS[key]"
+        :aria-label="NOTE_COLOR_LABELS[key]"
+        class="h-6 w-6 rounded-full border border-black/10 transition hover:scale-110 focus:outline-none focus-visible:ring-2 focus-visible:ring-brand"
+        :class="[NOTE_SWATCH_CLASSES[key], note.color === key ? 'ring-2 ring-brand' : '']"
+        @click.stop="pickColor(key)"
+      />
+    </div>
   </div>
 </template>