feat: Implement localStorage persistence for UI panel resize states in Draft and Deck views.

docs/development/devlog/2025-12-18-050000_resize_persistence.md

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+# Work Plan - Persist Resize State
+
+## Request
+The user wants resized areas (sidebar and pool) to be remembered (persisted) so they reopen with the same sizes.
+
+## Changes
+- **DraftView.tsx**:
+    - Updated initialization of `sidebarWidth` state to read from `localStorage.getItem('draft_sidebarWidth')`.
+    - Added `useEffect` to save `sidebarWidth` to `localStorage` whenever it changes.
+    - Verified `poolHeight` persistence logic already exists.
+
+- **DeckBuilderView.tsx**:
+    - Updated initialization of `sidebarWidth` and `poolHeightPercent` to read from `localStorage` keys `deck_sidebarWidth` and `deck_poolHeightPercent`.
+    - Added `useEffect` hooks to persist both values to `localStorage`.
+    - Added `useEffect` to imports (fixed lint error).
+
+## Verification
+- **Test**: Refreshing the page after resizing the sidebar or pool panel should restore the previous dimensions exactly.