fix(cli): disable shell autocompletion on completely empty prompts

To reduce visual noise and distraction, autocompletion is now suppressed when the shell prompt is entirely empty (or only contains whitespace). It remains active as soon as the user starts typing or moves the cursor to a position that would suggest paths/commands.

packages/cli/src/ui/hooks/useCommandCompletion.tsx

@@ -115,6 +115,19 @@ export function useCommandCompletion({
     const codePoints = toCodePoints(currentLine);
 
     if (shellModeActive) {
+      if (currentLine.trim().length === 0) {
+        return {
+          completionMode: CompletionMode.IDLE,
+          query: null,
+          completionStart: -1,
+          completionEnd: -1,
+          shellTokenIsCommand: false,
+          shellTokens: [],
+          shellCursorIndex: -1,
+          shellCommandToken: '',
+        };
+      }
+
       const tokenInfo = getTokenAtCursor(currentLine, cursorCol);
       if (tokenInfo) {
         return {