Use half-open hit tests for switch row clamp

Adjacent rows shared the same boundary because in_rect() used closed
intervals on both edges, which made the switch-specific nextafterf()
workaround necessary. Use half-open rect bounds and clamp the expanded
switch hit rect to row_height so boundary ownership is consistent
and the switch fix no longer relies on fragile edge adjustment.

Author: deantee

src/input.c

@@ -1296,11 +1296,9 @@ bool iui_switch(iui_context *ctx,
     /* Expand touch target for accessibility (48dp minimum per MD3) */
     iui_rect_t touch_rect = track_rect;
     iui_expand_touch_target_h(&touch_rect, IUI_SWITCH_TOUCH_TARGET);
-    if (touch_rect.height > ctx->layout.height) {
-        float touch_bottom =
-            nextafterf(ctx->layout.y + ctx->layout.height, ctx->layout.y);
+    if (touch_rect.height > ctx->row_height) {
         touch_rect.y = ctx->layout.y;
-        touch_rect.height = touch_bottom - touch_rect.y;
+        touch_rect.height = ctx->row_height;
     }
 
     iui_state_t state = iui_get_component_state(ctx, touch_rect, false);

src/internal.h

@@ -507,8 +507,8 @@ static inline iui_vec2 iui_vec2_add(iui_vec2 a, iui_vec2 b)
 
 static inline bool in_rect(const iui_rect_t *rect, iui_vec2 pos)
 {
-    return ((pos.x >= rect->x) && (pos.x <= rect->x + rect->width) &&
-            (pos.y >= rect->y) && (pos.y <= rect->y + rect->height));
+    return ((pos.x >= rect->x) && (pos.x < rect->x + rect->width) &&
+            (pos.y >= rect->y) && (pos.y < rect->y + rect->height));
 }
 
 static inline void expand_rect(iui_rect_t *rect, float amount)