Perf/memoize pools panel

[chuks68]

Closes #141
Summary
PoolsPanel was recomputing totalLiquidity, positions, and filteredPools using plain reduce and filter array methods on every single render. In networks with many pools, this resulted in wasted CPU cycles whenever unrelated state changes (like parent updates or keystrokes not touching the search query) occurred.

This PR wraps these calculations in useMemo with correct dependency keys (state.data and query) to avoid unnecessary recomputation.

Changes
PoolsPanel.tsx
: Wrapped totalLiquidity, positions, and filteredPools calculations in useMemo.
PoolsPanel.test.tsx
: Added a unit test spying on the matchesQuery function to verify that unrelated parent state/props re-renders do not recompute filteredPools.
Verification
Verified that rendered output is unchanged.
Confirmed that updating the search query or pool data updates the memoized values correctly.
Confirmed the new test passes and prevents regression.

[Jagadeeshftw]

Thanks — both commits on this branch (PoolsPanel memoization, SettlementTable responsive card layout) already landed via #352. Zero net diff after merging main in, so closing as already covered.