combat: extend FloatingText with label and effect_type

fields

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: Iad085ea5d8007257d77d606ab69e57a26a6a6964

src/common.h

@@ -108,6 +108,8 @@ typedef struct {
   int value;
   int lifetime;  // frames remaining
   int is_critical;
+  char label[8];                 // non-empty -> show label instead of numeric value
+  StatusEffectType effect_type;  // used to pick color for proc labels
 } FloatingText;
 
 // GameState - encapsulates all game state for testability and save/load