UI polish: notes/tasks list views

- NotesListView: skeleton shimmer for grid and list modes; grid columns change from fixed 3 to auto-fill(260px)
- NoteCard compact: flat border-bottom row style instead of stacked mini-cards; gradient fade mask on grid preview text
- TaskCard compact: flat border-bottom row style; show up to 2 tags
- TasksListView: gradient + shadow on New Task button (matches NotesListView)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/components/NoteCard.vue

@@ -78,6 +78,19 @@ function goEdit() {
   align-items: center;
   gap: 0.6rem;
   padding: 0.45rem 0.75rem;
+  background: var(--color-bg-card);
+  box-shadow: none;
+  border-radius: 0;
+  border-bottom: 1px solid var(--color-border);
+  transform: none !important;
+}
+.note-card.compact:first-child {
+  border-top: 1px solid var(--color-border);
+}
+.note-card.compact:hover {
+  box-shadow: none;
+  background: rgba(99, 102, 241, 0.04);
+  transform: none;
 }
 .note-title-compact {
   font-size: 0.9rem;
@@ -137,6 +150,9 @@ function goEdit() {
   font-size: 0.9rem;
   max-height: 7.5em;
   overflow: hidden;
+  position: relative;
+  -webkit-mask-image: linear-gradient(to bottom, black 60%, transparent 100%);
+  mask-image: linear-gradient(to bottom, black 60%, transparent 100%);
 }
 .note-meta {
   display: flex;

frontend/src/components/TaskCard.vue

@@ -59,6 +59,14 @@ function isOverdue(): boolean {
       <PriorityBadge :priority="task.priority!" />
       <span class="task-title-compact">{{ task.title || "Untitled" }}</span>
       <span v-if="projectTitle" class="project-crumb">{{ projectTitle }}</span>
+      <div class="task-tags-compact">
+        <TagPill
+          v-for="tag in task.tags?.slice(0, 2)"
+          :key="tag"
+          :tag="tag"
+          @click.stop="emit('tag-click', tag)"
+        />
+      </div>
       <span v-if="task.due_date" :class="['due-compact', { overdue: isOverdue() }]">
         {{ task.due_date }}
       </span>
@@ -115,6 +123,18 @@ function isOverdue(): boolean {
   align-items: center;
   gap: 0.5rem;
   padding: 0.4rem 0.75rem;
+  box-shadow: none;
+  border-radius: 0;
+  border-bottom: 1px solid var(--color-border);
+  transform: none !important;
+}
+.task-card.compact:first-child {
+  border-top: 1px solid var(--color-border);
+}
+.task-card.compact:hover {
+  box-shadow: none;
+  background: rgba(99, 102, 241, 0.04);
+  transform: none;
 }
 
 /* Status dot */
@@ -164,6 +184,11 @@ function isOverdue(): boolean {
   white-space: nowrap;
   flex-shrink: 0;
 }
+.task-tags-compact {
+  display: flex;
+  gap: 0.25rem;
+  flex-shrink: 0;
+}
 .due-compact {
   font-size: 0.75rem;
   color: var(--color-text-muted);