feat: complete M3 Web UI Enhancement milestone with include/exclude cards, fuzzy matching, mobile responsive design, and performance optimization

- Include/exclude cards feature complete with 300+ card knowledge base and intelligent fuzzy matching
- Enhanced visual validation with warning icons and performance benchmarks (100% pass rate)
- Mobile responsive design with bottom-floating controls, two-column layout, and horizontal scroll prevention
- Dark theme confirmation modal for fuzzy matches with card preview and alternatives
- Dual architecture support for web UI staging system and CLI direct build paths
- All M3 checklist items completed: fuzzy match modal, enhanced algorithm, summary panel, mobile responsive, Playwright tests

code/deck_builder/builder.py

@@ -118,7 +118,9 @@ class DeckBuilder(
             self.run_deck_build_step2()
             self._run_land_build_steps()
             # M2: Inject includes after lands, before creatures/spells
+            logger.info(f"DEBUG BUILD: About to inject includes. Include cards: {self.include_cards}")
             self._inject_includes_after_lands()
+            logger.info(f"DEBUG BUILD: Finished injecting includes. Current deck size: {len(self.card_library)}")
             if hasattr(self, 'add_creatures_phase'):
                 self.add_creatures_phase()
             if hasattr(self, 'add_spells_phase'):