## Context
Follow-up to #22562 (merged), which fixed the SSE-gap durability hole
from #22504 by calling `invalidateMetadataStore()` on SSE reconnect.
In review, @Weiko and a second reviewer flagged a performance concern:
firing a full invalidation on every reconnect can spam the backend, and
reconnect frequency is unbounded (`retryAttempts: Infinity`). The steer
was to lean on the per-collection hashes that `FindMinimalMetadata`
already returns and refetch only what actually changed.
## Problem
`invalidateMetadataStore()` sets `currentCollectionHash: undefined` for
every entity key. The staleness check in `useLoadMinimalMetadata` is
`entry.currentCollectionHash !== hash`, so nulling the hash makes
**every** collection compare as stale. Result: each reconnect forces a
full refetch of every metadata collection (objects, fields, views, ...),
even when nothing changed during the gap. That defeats the
collection-hash mechanism built to avoid exactly this.
## Change
Add `useResyncMetadataStore`, which only bumps
`metadataLoadedVersionState` without clearing collection hashes.
`MinimalMetadataLoadEffect` already re-runs on a version change, so this
triggers one `FindMinimalMetadata` query; the existing hash comparison
then marks only genuinely-changed collections stale.
`SSEClientEffect` now calls `resyncMetadataStore()` instead of
`invalidateMetadataStore()` on reconnect.
Net: same durability guarantee (changes missed during a disconnect are
caught on reconnect), but cost per reconnect drops from "refetch
everything" to "one lightweight hash query + refetch only what changed."
## Testing
1. Open a record page in a workspace.
2. Create a field / page-layout tab via the metadata API while the SSE
stream is dropped (background the tab, kill the network briefly, or
restart the server).
3. On reconnect the new metadata appears without a manual reload.
4. Reconnect with no metadata change triggers only a
`FindMinimalMetadata` query and no collection refetch.
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Thomas Trompette
2a94736ece
