Revamp talent and spellbook UIs with proper visuals and functionality

Talent screen:
- Remove all debug text and per-frame LOG_INFO spam
- Show class name in window title (e.g. "Warrior Talents")
- Display point distribution in header (0/31/20) and per-tab counts
- Highlighted active spec button with styled spec switcher
- Load and render tree background textures from TalentTab.dbc
- Draw prerequisite arrows with arrowheads (green=met, gray=unmet)
- Fix rank display (was showing rank+1, now correct 1-indexed values)
- Rank counter with dark background pill for readability
- Hover glow effect, rounded corners, centered grid layout
- Wider window (680x600) for 4-column WoW talent grid

Spellbook:
- Add search/filter bar for finding spells by name
- Add spell descriptions from Spell.dbc tooltip field
- Rich tooltips with name, rank, passive indicator, cooldown, description
- Visual icon borders: yellow=passive, red=cooldown, default=active
- Cooldown overlay on icon with countdown number
- Hover highlight on spell rows
- Tab counts update to reflect search filter results
- Rounded corners on icons and hover states
- Extracted renderSpellTooltip helper for consistent tooltip rendering

include/ui/spellbook_screen.hpp

@@ -18,8 +18,13 @@ struct SpellInfo {
     uint32_t spellId = 0;
     std::string name;
     std::string rank;
-    uint32_t iconId = 0;       // SpellIconID
-    uint32_t attributes = 0;   // Spell attributes (field 75)
+    std::string description;     // Tooltip/description text from Spell.dbc
+    uint32_t iconId = 0;         // SpellIconID
+    uint32_t attributes = 0;     // Spell attributes (field 4)
+    uint32_t castTimeMs = 0;     // Cast time in ms (0 = instant)
+    uint32_t manaCost = 0;       // Mana cost
+    uint32_t powerType = 0;      // 0=mana, 1=rage, 2=focus, 3=energy
+    uint32_t rangeIndex = 0;     // Range index from SpellRange.dbc
     bool isPassive() const { return (attributes & 0x40) != 0; }
 };
 
@@ -55,19 +60,21 @@ private:
     // Icon data (loaded from SpellIcon.dbc)
     bool iconDbLoaded = false;
     std::unordered_map<uint32_t, std::string> spellIconPaths; // SpellIconID -> path
-    std::unordered_map<uint32_t, VkDescriptorSet> spellIconCache;      // SpellIconID -> GL texture
+    std::unordered_map<uint32_t, VkDescriptorSet> spellIconCache; // SpellIconID -> texture
 
     // Skill line data (loaded from SkillLine.dbc + SkillLineAbility.dbc)
     bool skillLineDbLoaded = false;
-    std::unordered_map<uint32_t, std::string> skillLineNames;    // skillLineID -> name
-    std::unordered_map<uint32_t, uint32_t> skillLineCategories;  // skillLineID -> categoryID
-    std::unordered_map<uint32_t, uint32_t> spellToSkillLine;     // spellID -> skillLineID
+    std::unordered_map<uint32_t, std::string> skillLineNames;
+    std::unordered_map<uint32_t, uint32_t> skillLineCategories;
+    std::unordered_map<uint32_t, uint32_t> spellToSkillLine;
 
-    // Categorized spell tabs (rebuilt when spell list changes)
-    // ordered map so tabs appear in consistent order
+    // Categorized spell tabs
     std::vector<SpellTabInfo> spellTabs;
     size_t lastKnownSpellCount = 0;
 
+    // Search filter
+    char searchFilter_[128] = "";
+
     // Drag-and-drop from spellbook to action bar
     bool draggingSpell_ = false;
     uint32_t dragSpellId_ = 0;
@@ -79,6 +86,9 @@ private:
     void categorizeSpells(const std::unordered_set<uint32_t>& knownSpells);
     VkDescriptorSet getSpellIcon(uint32_t iconId, pipeline::AssetManager* assetManager);
     const SpellInfo* getSpellInfo(uint32_t spellId) const;
+
+    // Tooltip rendering helper
+    void renderSpellTooltip(const SpellInfo* info, game::GameHandler& gameHandler);
 };
 
 } // namespace ui

include/ui/talent_screen.hpp

@@ -20,8 +20,11 @@ public:
 
 private:
     void renderTalentTrees(game::GameHandler& gameHandler);
-    void renderTalentTree(game::GameHandler& gameHandler, uint32_t tabId);
-    void renderTalent(game::GameHandler& gameHandler, const game::GameHandler::TalentEntry& talent);
+    void renderTalentTree(game::GameHandler& gameHandler, uint32_t tabId,
+                          const std::string& bgFile);
+    void renderTalent(game::GameHandler& gameHandler,
+                      const game::GameHandler::TalentEntry& talent,
+                      uint32_t pointsInTree);
 
     void loadSpellDBC(pipeline::AssetManager* assetManager);
     void loadSpellIconDBC(pipeline::AssetManager* assetManager);
@@ -33,10 +36,11 @@ private:
     // DBC caches
     bool spellDbcLoaded = false;
     bool iconDbcLoaded = false;
-    std::unordered_map<uint32_t, uint32_t> spellIconIds;  // spellId -> iconId
+    std::unordered_map<uint32_t, uint32_t> spellIconIds;       // spellId -> iconId
     std::unordered_map<uint32_t, std::string> spellIconPaths;  // iconId -> path
     std::unordered_map<uint32_t, VkDescriptorSet> spellIconCache;  // iconId -> texture
-    std::unordered_map<uint32_t, std::string> spellTooltips;  // spellId -> description
+    std::unordered_map<uint32_t, std::string> spellTooltips;   // spellId -> description
+    std::unordered_map<uint32_t, VkDescriptorSet> bgTextureCache_;  // tabId -> bg texture
 };
 
 } // namespace ui