[FEAT] Add `useTransformStatus` Hook with Same Pattern as `useProcessingStatus`

[Emmzyemms]

Description:
The transform feature (Issue #27) requires a dedicated hook that reuses the SSE + polling fallback pattern.

Acceptance Criteria:

• app/hooks/useTransformStatus.ts mirrors useProcessingStatus.ts in structure
• Accepts jobId: string | null and enabled: boolean
• Updates transformStore.jobs[jobId] on each SSE event
• Falls back to polling GET /api/transform/[id] every 3 seconds on SSE error
• Cleans up SSE connection and polling interval on unmount
• Unit tests covering SSE happy path, SSE fallback, completion, and cleanup

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[Ayom04]

I will like to work on this.

[Ayom04]

Please, Assign this task to me, I gone through the description and It is somethign I can do.