fix(frontend): notify subscribers after persisted cache hydration - #413
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Thanks @Alae-Tamouh for this fix. One minor test improvement before approving.
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Issue #, if available: None
Description of changes:
Problem
Projects and sprints are hydrated from sessionStorage inside mount effects. Subscribers render before hydration and initially observe an empty external store. When the persisted entry is fresh, network revalidation returns early, so no version change occurs and mounted views can remain empty indefinitely.

Solution
Notify the existing project and per-project sprint external-store subscribers immediately after adopting persisted cache entries.
Impact
Dashboard, space, and sprint views rerender with fresh persisted data without requiring an unnecessary network request. Cache TTL and refresh behavior are unchanged.
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