add quest journal (QuestJournal + split UI view)

src/render/TextRenderer.h

@@ -30,6 +30,7 @@ public:
     void drawText(const std::string& text, float x, float y, float scale, bool centered, std::array<float, 4> color = { 1.f,1.f,1.f,1.f });
 
     float measureTextWidth(const std::string& text, float scale = 1.0f) const;
+    float getLineHeight(float scale = 1.0f) const { return lineHeight * scale; }
 
     // Clear cached meshes (call on window resize / DPI change)
     void ClearCache();