fix: keyboard shortcut(Alt+Shift+M) broken on Chrome (#31844)

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## **Description**

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"_execute_browser_action" is no longer available in Chrome MV3, should
use "_execute_action". but "_execute_action" doesn't work in
Firefox(Firefox MV3 only support "_execute_browser_action" now).

**Solution**:
Add both "_execute_browser_action" and "_execute_action" in config file

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## **Related issues**

Fixes: #31837

## **Manual testing steps**

1. Install the extension in Chrome
2. Open Chrome and type Alt+Shift+M
3. Check if popup opend

## **Screenshots/Recordings**
### **After**
Test in Chrome:


https://github.com/user-attachments/assets/7bfc858f-7da1-4931-b100-c44e28dfee93

Test in Firefox:


https://github.com/user-attachments/assets/32d6e330-c226-49b6-ae40-41ece5e509dd


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Extension Coding
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- [ ] I've completed the PR template to the best of my ability
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Not required for external contributors.

## **Pre-merge reviewer checklist**

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [ ] I confirm that this PR addresses all acceptance criteria described
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as recordings and or screenshots.

Author: Teng-Web3

app/manifest/v3/_base.json

@@ -18,6 +18,14 @@
   },
   "commands": {
     "_execute_browser_action": {
+      "suggested_key": {
+        "windows": "Alt+Shift+M",
+        "mac": "Alt+Shift+M",
+        "chromeos": "Alt+Shift+M",
+        "linux": "Alt+Shift+M"
+      }
+    },
+    "_execute_action": {
       "suggested_key": {
         "default": "Alt+Shift+M",
         "windows": "Alt+Shift+M",