docs: update README with new mole-style menu and box-drawing logo

- Replace old interactive menu screenshot with new numbered menu
- Add box-drawing GAI logo
- Document number/letter hotkeys (1-8, H, V, Q)
- Note 'Press Enter to return' behavior

README.md

@@ -118,22 +118,29 @@ git diff | gai suggest branch
 
 ### Interactive Menu
 
-```
-$ gai
+Run `gai` without arguments to open the mole-style interactive menu:
 
-  gai
-  AI-powered git helper — choose a workflow
-  ↑/↓ navigate · enter/space select · ctrl+c cancel
-
-  ❯ ● commit     Generate AI commit message
-    ○ pr         Create a PR with AI-generated title
-    ○ explain    Explain staged changes in plain language
-    ○ review     AI code review of staged changes
-    ○ changelog  Generate changelog from commits
-    ○ suggest    Suggest branch name or commit type
-    ○ amend      Amend last commit with AI message
-    ○ config     Configure API settings
 ```
+  ██████╗  █████╗ ██╗
+ ██╔════╝ ██╔══██╗██║
+ ██║  ██╗ ███████║██║
+ ██║  ██║ ██╔══██║██║
+ ╚██████╝ ██║  ██║██║  AI-powered git helper
+  ╚═════╝ ╚═╝  ╚═╝╚═╝  v0.1.3
+
+ ➤ 1. Commit       Generate AI commit message
+   2. PR           Create a PR with AI-generated title
+   3. Explain      Explain staged changes in plain language
+   4. Review       AI code review of staged changes
+   5. Changelog    Generate changelog from commits
+   6. Suggest      Suggest branch name or commit type
+   7. Amend        Amend last commit with AI message
+   8. Config       Configure API settings
+
+ ↑↓  |  Enter  |  H Help  |  V Version  |  Q Quit
+```
+
+Number keys `1`–`8` jump directly to the corresponding action. After a command finishes, press Enter to return to the menu.
 
 ### Command Examples