message: fix: Change shortcut modifiers to avoid app/OS conflicts
diff: "commands": {
  "_execute_browser_action": {
  "suggested_key": {
  - "windows": "Ctrl+Shift+K",
  - "mac": "Command+Shift+K",
  - "chromeos": "Ctrl+Shift+K",
  - "linux": "Ctrl+Shift+K"
  + "windows": "Alt+Shift+K",
  + "mac": "Alt+Shift+K",
  + "chromeos": "Alt+Shift+K",
  + "linux": "Alt+Shift+K"
  },
  "description": "Activate the extension"
  },
  "01_toggle-issues": {
  "suggested_key": {
  - "windows": "Ctrl+Shift+1",
  - "mac": "Command+Shift+1",
  - "chromeos": "Ctrl+Shift+1",
  - "linux": "Ctrl+Shift+1"
  + "windows": "Alt+Shift+1",
  + "mac": "Alt+Shift+1",
  + "chromeos": "Alt+Shift+1",
  + "linux": "Alt+Shift+1"
  },
  "description": "Toggle Automated checks"
  },
  "02_toggle-landmarks": {
  "suggested_key": {
  - "windows": "Ctrl+Shift+2",
  - "mac": "Command+Shift+2",
  - "chromeos": "Ctrl+Shift+2",
  - "linux": "Ctrl+Shift+2"
  + "windows": "Alt+Shift+2",
  + "mac": "Alt+Shift+2",
  + "chromeos": "Alt+Shift+2",
  + "linux": "Alt+Shift+2"
  },
  "description": "Toggle Landmarks"
  },
  "03_toggle-headings": {
  "suggested_key": {
  - "windows": "Ctrl+Shift+3",
  - "mac": "Command+Shift+3",
  - "chromeos": "Ctrl+Shift+3",
  - "linux": "Ctrl+Shift+3"
  + "windows": "Alt+Shift+3",
  + "mac": "Alt+Shift+3",
  + "chromeos": "Alt+Shift+3",
  + "linux": "Alt+Shift+3"
  },
  "description": "Toggle Headings"
  },
  