feat: add clone shortcut with multi-select and condensed TUI footer#41

cameronsjo wants to merge 1 commit intowiiiimm:mainwiiiimm/gh-manager-cli:mainfrom

cameronsjo:claude/condensed-tui-shortcuts-012SXD18KNny9Nxsme9Hhn5Vcameronsjo/gh-manager-cli:claude/condensed-tui-shortcuts-012SXD18KNny9Nxsme9Hhn5VCopy head branch name to clipboard