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/managers/timeline-manager/internal/load-support.svelte.ts

@@ -0,0 +1,62 @@
+import { authManager } from '$lib/managers/auth-manager.svelte';
+import { toISOYearMonthUTC } from '$lib/utils/timeline-util';
+import { getTimeBucket } from '@immich/sdk';
+
+import type { MonthGroup } from '../month-group.svelte';
+import type { TimelineManager } from '../timeline-manager.svelte';
+import type { TimelineManagerOptions } from '../types';
+import { layoutMonthGroup } from './layout-support.svelte';
+
+export async function loadFromTimeBuckets(
+  timelineManager: TimelineManager,
+  monthGroup: MonthGroup,
+  options: TimelineManagerOptions,
+  signal: AbortSignal,
+): Promise<void> {
+  if (monthGroup.getFirstAsset()) {
+    return;
+  }
+
+  const timeBucket = toISOYearMonthUTC(monthGroup.yearMonth);
+  const key = authManager.key;
+  const bucketResponse = await getTimeBucket(
+    {
+      ...options,
+      timeBucket,
+      key,
+    },
+    { signal },
+  );
+
+  if (!bucketResponse) {
+    return;
+  }
+
+  if (options.timelineAlbumId) {
+    const albumAssets = await getTimeBucket(
+      {
+        albumId: options.timelineAlbumId,
+        timeBucket,
+        key,
+      },
+      { signal },
+    );
+    for (const id of albumAssets.id) {
+      timelineManager.albumAssets.add(id);
+    }
+  }
+
+  const unprocessedAssets = monthGroup.addAssets(bucketResponse);
+  if (unprocessedAssets.length > 0) {
+    console.error(
+      `Warning: getTimeBucket API returning assets not in requested month: ${monthGroup.yearMonth.month}, ${JSON.stringify(
+        unprocessedAssets.map((unprocessed) => ({
+          id: unprocessed.id,
+          localDateTime: unprocessed.localDateTime,
+        })),
+      )}`,
+    );
+  }
+
+  layoutMonthGroup(timelineManager, monthGroup);
+}