Add Cmd/Ctrl+R keybinding to refresh PR overview in editor

[Copilot]

Users expect standard refresh shortcuts to work when viewing a PR overview in the editor. Currently, the refresh functionality exists but requires clicking a button or using the command palette.

Changes

• Added keybinding in package.json mapping Cmd+R (Mac) / Ctrl+R (Windows/Linux) to the existing pr.refreshDescription command
• Scoped to only activate when activeWebviewPanelId == 'PullRequestOverview' to avoid conflicts with other editor contexts

{
  "key": "ctrl+r",
  "mac": "cmd+r",
  "command": "pr.refreshDescription",
  "when": "activeWebviewPanelId == 'PullRequestOverview'"
}

No changes to command logic required - leverages existing refresh implementation.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Command R should refresh PR when in editor view</issue_title> <issue_description>I want to use Command R shortcut to refresh the main PR view when open in the editor</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes microsoft/vscode-pull-request-github#7117

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