Batch-hydrate search hits, drop stale ones and self-heal the index

[loevgaard]

What

SearchAction re-hydrated every Meilisearch hit from the database one find() at a time — with the default hits_per_page of 60, up to 60 extra queries per search page, partly negating Meilisearch's speed. On top of that a hit whose entity no longer existed was silently dropped (so the "N results" count and the rendered cards could disagree, and the page could even render empty while claiming results), and find() didn't re-check enabled, so a product disabled after its last indexing was still displayed.

• Batch hydration: hit ids are grouped by entityClass and each group is loaded with a single findBy(['id' => $ids]), then reordered to match Meilisearch's ranking. 60 queries become one per entity class.
• Drop stale hits + self-heal: a hit whose entity is missing from the database, or is disabled (ToggleableInterface), is not rendered and a RemoveEntity is dispatched for it so the index heals on the next request. The dispatch is failure-safe — an error is logged, never breaks rendering.
• The reorder/drop logic lives in the pure static reorderAndFilter() for straightforward unit testing.

Testing

• SearchActionTest: entities are reordered to match the hit order; a hit whose entity is missing is dropped and reported stale; a disabled entity is dropped and reported stale.
• The functional SearchSortingTest/SearchPaginationTest (which render the search page) still pass; lint:container is clean.

Closes #120

---

Stacked on #164 (#138).

[codecov]

Codecov Report

❌ Patch coverage is 35.13514% with 24 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.82%. Comparing base (3d030e8) to head (df023f3).

Files with missing lines	Patch %	Lines
src/Controller/Action/SearchAction.php	35.13%	24 Missing ⚠️

Additional details and impacted files

@@                              Coverage Diff                              @@
##             issue-138-ordered-searchable-attributes     #165      +/-   ##
=============================================================================
- Coverage                                      48.90%   48.82%   -0.09%     
- Complexity                                       781      796      +15     
=============================================================================
  Files                                            139      139              
  Lines                                           2521     2552      +31     
=============================================================================
+ Hits                                            1233     1246      +13     
- Misses                                          1288     1306      +18     

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