refactor: timeline manager renames (#19007)

* refactor: timeline manager renames

* refactor(web): improve timeline manager naming consistency

- Rename AddContext → GroupInsertionCache for clearer purpose
- Rename TimelineDay → DayGroup for better clarity
- Rename TimelineMonth → MonthGroup for better clarity
- Replace all "bucket" references with "monthGroup" terminology
- Update all component props, method names, and variable references
- Maintain consistent naming patterns across TypeScript and Svelte files

* refactor(web): rename buckets to months in timeline manager

- Rename TimelineManager.buckets property to months
- Update all store.buckets references to store.months
- Use 'month' shorthand for monthGroup arguments (not method names)
- Update component templates and test files for consistency
- Maintain API-related 'bucket' terminology (bucketHeight, getTimeBucket)

* refactor(web): rename assetStore to timelineManager and update types

- Rename assetStore variables to timelineManager in all .svelte files
- Update parameter names in actions.ts and asset-utils.ts functions
- Rename AssetStoreLayoutOptions to TimelineManagerLayoutOptions
- Rename AssetStoreOptions to TimelineManagerOptions
- Move assets-store.spec.ts to timeline-manager.spec.ts

* refactor(web): rename intersectingAssets to viewerAssets and fix property references

- Rename intersectingAssets to viewerAssets in DayGroup and MonthGroup classes
- Update arrow function parameters to use viewerAsset/viewAsset shorthand
- Rename topIntersectingBucket to topIntersectingMonthGroup
- Fix dateGroups references to dayGroups in asset-utils.ts and album page
- Update template loops and variable names in Svelte components

* refactor(web): rename #initializeTimeBuckets to #initializeMonthGroups and bucketDateFormatted to monthGroupTitle

* refactor(web): rename monthGroupHeight to height

* refactor(web): rename bucketCount to assetsCount, bucketsIterator to monthGroupIterator, and related properties

* refactor(web): rename count to assetCount in TimelineManager

* refactor(web): rename LiteBucket to ScrubberMonth and update scrubber variables

- Rename LiteBucket type to ScrubberMonth
- Rename bucketDateFormattted to title in ScrubberMonth type
- Rename bucketPercentY to monthGroupPercentY in scrubber component
- Rename scrubBucket to scrubberMonth and scrubBucketPercent to scrubberMonthPercent

* fix remaining refs to bucket

* reset submodule to correct commit

* reset submodule to correct commit

* refactor(web): extract TimelineManager internals into separate modules

- Move search-related functions to internal/search-support.svelte.ts
- Extract websocket event handling into WebsocketSupport class
- Move utility functions (updateObject, isMismatched) to internal/utils.svelte.ts
- Update imports in tests to use new module structure

* refactor(web): extract intersection logic from TimelineManager

- Create intersection-support.svelte.ts with updateIntersection and calculateIntersecting functions
- Remove private intersection methods from TimelineManager
- Export findMonthGroupForAsset from search-support for reuse
- Update TimelineManager to use the extracted intersection functions

* refactor(web): rename a few methods in intersecting

* refactor(web): rename a few methods in intersecting

* refactor(web): extract layout logic from TimelineManager

- Create layout-support.svelte.ts with updateGeometry and layoutMonthGroup functions
- Remove private layout methods from TimelineManager
- Update TimelineManager to use the extracted layout functions
- Remove unused UpdateGeometryOptions import

* refactor(web): extract asset operations from TimelineManager

- Create operations-support.svelte.ts with addAssetsToMonthGroups and runAssetOperation functions
- Remove private asset operation methods from TimelineManager
- Update TimelineManager to use extracted operation functions with proper AssetOrder handling
- Rename getMonthGroupIndexByAssetId to getMonthGroupByAssetId for consistency
- Move utility functions from utils.svelte.ts to internal/utils.svelte.ts
- Fix method name references in asset-grid.svelte and tests

* refactor(web): extract loading logic from TimelineManager

- Create load-support.svelte.ts with loadFromTimeBuckets function
- Extract time bucket loading, album asset handling, and error logging
- Simplify TimelineManager's loadMonthGroup method to use extracted function

* refresh timeline after archive keyboard shortcut

* remove debugger

* rename

* Review comments - remove shadowed var

* reduce indents - early return

* review comment

* refactor: simplify asset filtering in addAssets method

Replace for loop with filter operation for better readability

* fix: bad merge

* refactor(web): simplify timeline layout algorithm

- Replace rowSpaceRemaining array with direct cumulative width tracking
- Invert logic from tracking remaining space to tracking used space
- Fix spelling: cummulative to cumulative
- Rename lastRowHeight to currentRowHeight for clarity
- Remove confusing lastRow variable and simplify final height calculation
- Add explanatory comments for clarity
- Rename loop variable assetGroup to dayGroup for consistency

* simplify assetsIterator usage

* merge/lint

---------

Co-authored-by: Alex <alex.tran1502@gmail.com>

web/src/lib/components/album-page/album-viewer.svelte

@@ -4,15 +4,16 @@
   import AlbumMap from '$lib/components/album-page/album-map.svelte';
   import SelectAllAssets from '$lib/components/photos-page/actions/select-all-assets.svelte';
   import AssetSelectControlBar from '$lib/components/photos-page/asset-select-control-bar.svelte';
+  import { TimelineManager } from '$lib/managers/timeline-manager/timeline-manager.svelte';
   import { AssetInteraction } from '$lib/stores/asset-interaction.svelte';
   import { assetViewingStore } from '$lib/stores/asset-viewing.store';
-  import { AssetStore } from '$lib/managers/timeline-manager/asset-store.svelte';
   import { dragAndDropFilesStore } from '$lib/stores/drag-and-drop-files.store';
   import { featureFlags } from '$lib/stores/server-config.store';
   import { handlePromiseError } from '$lib/utils';
   import { cancelMultiselect, downloadAlbum } from '$lib/utils/asset-utils';
   import { fileUploadHandler, openFileUploadDialog } from '$lib/utils/file-uploader';
   import type { AlbumResponseDto, SharedLinkResponseDto, UserResponseDto } from '@immich/sdk';
+  import { IconButton } from '@immich/ui';
   import { mdiFileImagePlusOutline, mdiFolderDownloadOutline } from '@mdi/js';
   import { onDestroy } from 'svelte';
   import { t } from 'svelte-i18n';
@@ -22,7 +23,6 @@
   import ImmichLogoSmallLink from '../shared-components/immich-logo-small-link.svelte';
   import ThemeButton from '../shared-components/theme-button.svelte';
   import AlbumSummary from './album-summary.svelte';
-  import { IconButton } from '@immich/ui';
 
   interface Props {
     sharedLink: SharedLinkResponseDto;
@@ -35,9 +35,9 @@
 
   let { isViewing: showAssetViewer } = assetViewingStore;
 
-  const assetStore = new AssetStore();
-  $effect(() => void assetStore.updateOptions({ albumId: album.id, order: album.order }));
-  onDestroy(() => assetStore.destroy());
+  const timelineManager = new TimelineManager();
+  $effect(() => void timelineManager.updateOptions({ albumId: album.id, order: album.order }));
+  onDestroy(() => timelineManager.destroy());
 
   const assetInteraction = new AssetInteraction();
 
@@ -61,7 +61,7 @@
 />
 
 <main class="relative h-dvh overflow-hidden px-2 md:px-6 max-md:pt-(--navbar-height-md) pt-(--navbar-height)">
-  <AssetGrid enableRouting={true} {album} {assetStore} {assetInteraction}>
+  <AssetGrid enableRouting={true} {album} {timelineManager} {assetInteraction}>
     <section class="pt-8 md:pt-24 px-2 md:px-0">
       <!-- ALBUM TITLE -->
       <h1
@@ -93,7 +93,7 @@
       assets={assetInteraction.selectedAssets}
       clearSelect={() => assetInteraction.clearMultiselect()}
     >
-      <SelectAllAssets {assetStore} {assetInteraction} />
+      <SelectAllAssets {timelineManager} {assetInteraction} />
       {#if sharedLink.allowDownload}
         <DownloadAction filename="{album.albumName}.zip" />
       {/if}