feat: Implement deck builder magnified card view, land advice, basic land integration, and unlimited time for deck construction.

docs/development/devlog/2025-12-17-155500_land_advice_and_unlimited_time.md

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+# Land Advice and Unlimited Deck Building
+
+## Requirements
+1.  **Unlimited Timer**: The deck building phase should have an unlimited duration for now.
+2.  **Land Advice Algorithm**:
+    - Suggest a mana base aiming for a total of 17 lands (including those already picked in the deck).
+    - Calculate the number of basic lands needed based on the color distribution (mana symbols) of the non-land cards in the deck.
+    - Provide a UI to view and apply these suggestions.
+
+## Implementation Details
+
+### `DeckBuilderView.tsx`
+
+-   **Timer disabled**: `useState<string>("Unlimited")` is used effectively to remove the countdown mechanism.
+-   **Land Suggestion Algorithm**:
+    -   Target total lands: 17.
+    -   `existingLands` calculated from cards in `deck` with type `Land`.
+    -   `landsNeeded` = `max(0, 17 - existingLands)`.
+    -   Scans `mana_cost` of non-land cards to build a frequency map of colored mana symbols (`{W}`, `{U}`, etc.).
+    -   Distributes `landsNeeded` proportionally to the symbol counts.
+    -   Handles remainders by allocating them to the colors with the highest symbol counts.
+    -   Returns `null` if no colored symbols or `landsNeeded` is 0.
+-   **UI**:
+    -   A panel "Land Advisor (Target: 17)" is added above the Land Station.
+    -   Displays the calculated basic land distribution (e.g., "P: 3, I: 2").
+    -   "Auto-Fill" button applies these counts to the `lands` state directly.
+
+## Verification
+-   Verified manually that adding/removing cards updates the suggestion logic.
+-   "Unlimited" timer is displayed correctly.
+-   Lint errors resolved.