docs: update README menu layout to grouped categories

README.md

@@ -121,23 +121,26 @@ git diff | gai suggest branch
 Run `gai` without arguments to open the mole-style interactive menu:
 
 ```
-  ██████╗  █████╗ ██╗
- ██╔════╝ ██╔══██╗██║
- ██║  ██╗ ███████║██║
- ██║  ██║ ██╔══██║██║
- ╚██████╝ ██║  ██║██║  AI-powered git helper
-  ╚═════╝ ╚═╝  ╚═╝╚═╝  v0.1.3
+  gai v0.1.3
+  AI-powered git helper for commits, PRs, reviews, and changelogs
+  ────────────────────────────────────────────────────────────────────────
 
- ➤ 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
+  CREATE
+  │ › 1  Commit     Generate AI commit message
+      2  PR         Create a PR with AI-generated title
+      3  Amend      Amend last commit with AI message
 
- ↑↓  |  Enter  |  H Help  |  V Version  |  Q Quit
+  INSPECT
+      4  Explain    Explain staged changes in plain language
+      5  Review     AI code review of staged changes
+      6  Changelog  Generate changelog from commits
+      7  Suggest    Suggest branch name or commit type
+
+  PROJECT
+      8  Config     Configure API settings
+
+  ────────────────────────────────────────────────────────────────────────
+  ↑/↓ navigate   enter run   1-8 jump   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.