Create Timeline facade component to unify timeline usage

• Create timeline/timeline.svelte as main entry point for timeline functionality
• Combine BaseTimeline, TimelineKeyboardActions, and TimelineAssetViewer
• Update all route imports from base-timeline to use Timeline component
• Move scrubber.svelte to timeline/base-components/
• Fix timeline-keyboard-actions date handling from result.dateTime to result.date
• Clean up unused imports and props

web/src/routes/(user)/locked/[[photos=photos]]/[[assetId=id]]/+page.svelte

@@ -10,7 +10,7 @@
   import AssetSelectControlBar from '$lib/components/photos-page/asset-select-control-bar.svelte';
   import ButtonContextMenu from '$lib/components/shared-components/context-menu/button-context-menu.svelte';
   import EmptyPlaceholder from '$lib/components/shared-components/empty-placeholder.svelte';
-  import AssetGrid from '$lib/components/timeline/base-components/base-timeline.svelte';
+  import Timeline from '$lib/components/timeline/timeline.svelte';
   import { AppRoute, AssetAction } from '$lib/constants';
   import { TimelineManager } from '$lib/managers/timeline-manager/timeline-manager.svelte';
   import { AssetInteraction } from '$lib/stores/asset-interaction.svelte';
@@ -58,7 +58,7 @@
     </Button>
   {/snippet}
 
-  <AssetGrid
+  <Timeline
     enableRouting={true}
     {timelineManager}
     {assetInteraction}
@@ -68,7 +68,7 @@
     {#snippet empty()}
       <EmptyPlaceholder text={$t('no_locked_photos_message')} title={$t('nothing_here_yet')} />
     {/snippet}
-  </AssetGrid>
+  </Timeline>
 </UserPageLayout>
 
 <!-- Multi-selection mode app bar -->