fix: add missing math.h include and fix unused variable warning

Co-authored-by: aider (deepseek/deepseek-coder) <aider@aider.chat>

tui.c

@@ -8,6 +8,7 @@
 #include <signal.h>
 #include <stdatomic.h>
 #include <ctype.h>
+#include <math.h>
 
 #define GRID_ROWS 8
 #define GRID_COLS 8
@@ -401,8 +402,8 @@ static void start_fuzzy_search(const char *prompt, void (*callback)(const char *
     
     // Initialize results with all plugins
     fuzzy_search.num_results = 0;
-    int count;
-    const char **plugins = carla_get_available_plugins(NULL, &count);
+    int count = 0;
+    carla_get_available_plugins(NULL, &count);
     for (int i = 0; i < count; i++) {
         fuzzy_search.result_indices[fuzzy_search.num_results++] = i;
     }