UX improvements

src/ui/layout.h

@@ -43,18 +43,30 @@ namespace Layout {
 namespace detail {
     inline float& userFontScaleRef() { static float s = 1.0f; return s; }
     inline bool&  fontReloadNeededRef() { static bool s = false; return s; }
+    inline float& fontAtlasScaleRef() { static float s = 1.0f; return s; }
 }
 
 /**
- * @brief Get the user's font scale preference (1.0–3.0).
+ * @brief Get the user's font scale preference (1.0–1.5).
  * Multiplied into font loading so glyphs render at the chosen size.
  */
 inline float userFontScale() { return detail::userFontScaleRef(); }
 
+/**
+ * @brief Get the user font scale at which the font atlas was last built.
+ * Used to compute FontScaleMain compensation during smooth slider drag.
+ */
+inline float fontAtlasScale() { return detail::fontAtlasScaleRef(); }
+
+/**
+ * @brief Record the font atlas scale after a rebuild.
+ * Called from Typography::load() after the atlas is built.
+ */
+inline void setFontAtlasScale(float v) { detail::fontAtlasScaleRef() = v; }
+
 /**
  * @brief Set the user's font scale and flag a font reload.
- * Called from the settings UI; the main loop detects the flag and
- * calls Typography::reload().
+ * Called on slider release for a crisp atlas rebuild.
  */
 inline void setUserFontScale(float v) {
     v = std::max(1.0f, std::min(1.5f, v));
@@ -64,6 +76,16 @@ inline void setUserFontScale(float v) {
     }
 }
 
+/**
+ * @brief Set the user's font scale WITHOUT flagging a font reload.
+ * Called every frame while the slider is being dragged for smooth
+ * visual scaling via FontScaleMain compensation.
+ */
+inline void setUserFontScaleVisual(float v) {
+    v = std::max(1.0f, std::min(1.5f, v));
+    detail::userFontScaleRef() = v;
+}
+
 /**
  * @brief Consume the pending font-reload flag (returns true once).
  */