fix: gg now requires two g presses (not just one)

Added pendingGRef to track when waiting for second 'g':
- First g: Set pendingGRef = true, return null (no action)
- Second g: Check pendingGRef, if true → 'top' anchor
- Any other key after first g: Clear pendingGRef, return null

Now:
- g alone → Nothing (waiting for second g)
- gg → Jump to top of column
- G → Jump to bottom of column

Matches vim behavior for gg command.

src/useCursor/useVimMotions.ts

@@ -4,8 +4,17 @@ import type { VimMotionSystem, Motion } from './types';
 export function useVimMotions(): VimMotionSystem {
   const countRef = useRef<string>('');
   const lastMotionRef = useRef<Motion | null>(null);
+  const pendingGRef = useRef<boolean>(false);
 
   function processKey(key: string): { type: 'move'|'anchor'|'repeat'|'count', data: any } | null {
+    if (pendingGRef.current) {
+      pendingGRef.current = false;
+      if (key === 'g') {
+        resetCount();
+        return { type: 'anchor', data: 'top' };
+      }
+      return null;
+    }
     if (key >= '0' && key <= '9') {
       if (key === '0' && countRef.current === '') {
         return { type: 'anchor', data: 'start' };
@@ -53,8 +62,8 @@ export function useVimMotions(): VimMotionSystem {
     }
 
     if (key === 'g') {
-      resetCount();
-      return { type: 'anchor', data: 'top' };
+      pendingGRef.current = true;
+      return null;
     }
 
     if (key === 'G') {