Web pools: pools table empty and loading states


**Area:** `apps/web/src/features/pools/components/gm-pools-table.tsx`

**Goal:** Ensure the pool table is useful while data is loading or empty.

**Tasks:**

- Render loading state.
- Render empty state.
- Render at least one fixture row.
- Assert visible columns and row text.

**Acceptance:**

- No test IDs unless there is no accessible handle.
- `bun run --cwd apps/web test` passes.

