feat: document quota bar, terminal approval, and diff viewer

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: devvaannsh

docs/12-Pro Features/01-ai-chat.md

@@ -14,7 +14,7 @@ Phoenix Code comes with a built-in AI assistant powered by Claude Code. You can
 > AI Chat is available only in desktop apps. 
 
 :::note
-Free users get a daily and monthly chat limit. [Upgrade to Phoenix Code Pro](https://phcode.io/pricing) for unlimited access.
+Free users get a daily and monthly chat limit. Once you're past halfway on either limit, a usage bar appears at the top of the chat. [Upgrade to Phoenix Code Pro](https://phcode.io/pricing) for unlimited access.
 :::
 
 <VideoPlayer
@@ -84,6 +84,22 @@ The AI has three permission levels that control how much it can do on its own. C
 
 ![Permission mode selector](./images/ai-permissions.png "Permission mode selector")
 
+## Approving Terminal Commands
+
+In Edit mode (the default), the AI shows an **Allow / Deny** card before running any terminal command. The card displays the full command so you can verify it before approving. Choosing **Deny** lets the AI continue with the rest of its response without running it.
+
+> Bash confirmations are skipped in Full Auto mode.
+
+## Reviewing Diffs
+
+Every edit card shows the number of lines added and removed, along with a **Show diff** button that toggles a unified diff of the change inline. Click the **three-dot menu** on the card to:
+
+- **Expand all** - open every diff section on the card at once
+- **Collapse all** - hide every diff section on the card
+- **Always show** - keep diffs open by default on future edits without clicking Show diff each time
+
+![Edit card with the diff menu open](./images/ai-diff.png "The three-dot menu on an edit card shows Expand all, Collapse all, and Always show")
+
 ## Session History
 
 Every conversation is saved automatically. Click the **history dropdown** at the top of the panel to see your recent sessions and switch between them.