fix: add UIMode enum to test_tui.c and remove unused yank_count variables

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

test_tui.c

@@ -6,6 +6,13 @@
 #include <stdatomic.h>
 #include "tui.h"
 
+// Mode definitions (mirrored from tui.c)
+typedef enum {
+    MODE_NORMAL,
+    MODE_VISUAL,
+    MODE_MOVE
+} UIMode;
+
 // Test helper
 static Engine *create_test_engine(void) {
     Engine *engine = (Engine *)calloc(1, sizeof(Engine));
@@ -851,7 +858,6 @@ void test_paste_clips(void) {
     
     // Simulate yanking clip at position (1, 1) = clip 9
     int yank_buffer[] = {9};
-    int yank_count = 1;
     int selected_row = 3, selected_col = 3;  // Paste at position (3, 3) = clip 27
     
     // Calculate offset
@@ -889,7 +895,6 @@ void test_paste_bounds_checking(void) {
     
     // Yank clip at position (7, 7) = clip 63 (bottom-right)
     int yank_buffer[] = {63};
-    int yank_count = 1;
     int selected_row = 0, selected_col = 0;  // Paste at top-left
     
     // Calculate offset