feat: Implement pack count validation for online play, adding a dynamic rules tooltip and button state based on available packs.

docs/development/devlog/2025-12-17-031500_play_online_logic.md

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+### Play Online Logic Implementation
+
+**Status**: Completed
+**Date**: 2025-12-17
+
+**Description**
+Implemented pack count validation logic for "Play Online" to strictly enforce draft player limits.
+
+**Changes**
+1.  **Rule Enforcement**:
+    -   **< 12 packs**: Button visual disabled (slate color), shows error toast explaining rules if clicked.
+    -   **12-17 packs**: Allows entry, shows toast "Enough for 4 players only" (Info).
+    -   **18-23 packs**: Allows entry, shows toast "Enough for 4 or 6 players" (Info).
+    -   **24+ packs**: Allows entry, shows toast "Enough for 8 players!" (Success).
+2.  **UI Feedback**: Updated button class logic to visually reflect availability based on pack count.
+
+**Effect**
+Prevents users from starting unplayable drafts and informs them of the capacity their current pool supports.