Generalize aggregated notes to a shared component, reuse in Asset panel

Moves shot/ShotNotes.vue to shared/EntityNotes.vue (it had no
shot-specific logic) and wires it into AssetDetailPanel.vue too,
replacing the old read-only AssetNotes.vue. Asset panel gains the same
multi-select task filter, sort, client-only/submission-notes toggles,
and bottom composer that Shot's panel already had, plus the same
min-h-0 layout fix needed for the pinned composer.

NoteItem's absolute-format timestamp now shows date-only (y/m/d) with
an info icon whose tooltip reveals the full y/m/d H:M:S - applied to
both note and submission-note entries.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

frontend/src/components/shot/ShotDetailPanel.vue

@@ -214,7 +214,7 @@
           <div v-if="isLoadingNotes" class="text-center py-8 text-sm text-muted-foreground">
             Loading notes...
           </div>
-          <ShotNotes
+          <EntityNotes
             v-else
             :key="shotId"
             :tasks="tasks"
@@ -335,7 +335,7 @@ import DetailPanelLoading from '@/components/shared/DetailPanelLoading.vue'
 import DetailPanelError from '@/components/shared/DetailPanelError.vue'
 import DetailPanelHeader from '@/components/shared/DetailPanelHeader.vue'
 import TaskStatusBadge from '@/components/task/TaskStatusBadge.vue'
-import ShotNotes from './ShotNotes.vue'
+import EntityNotes from '@/components/shared/EntityNotes.vue'
 
 import { shotService, type Shot, type TaskStatusInfo } from '@/services/shot'
 import { taskService, type ProductionNote, type Submission } from '@/services/task'