⚡ Bolt: [Performance Improvement] Prevent O(N) allocations and re-renders on missing state item deletions

[ClarusIubar]

💡 What: Replaced unconditional .filter() operations with .findIndex() lookups when removing single items from React state arrays in src/store/notification-store/actions.ts and src/store/notification-store/helpers.ts. When an item is not found, the original array reference is returned to abort the update entirely.

🎯 Why: Calling .filter() always creates a brand new array, triggering O(N) memory allocations, garbage collection pressure, and, importantly, unnecessary React state reconciliations, even if the target item does not exist in the array. This happens frequently when deleting a resource that might be present in some state arrays but not others.

📊 Impact: Reduces O(N) memory allocations and eliminates unnecessary React component tree re-renders for missing targets, resulting in a tighter, more efficient state update cycle for deletions.

🔬 Measurement: Review src/store/notification-store/actions.ts and helpers.ts. Array object identities remain stable across deleteNotification dispatches if the item was already absent from the local view. The tests pass cleanly.

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PR created automatically by Jules for task 12753926019551412995 started by @ClarusIubar

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