[Feature Request] Add keyboard shortcut to copy last message output to clipboard

Bug Description
I'd really love a shortcut to copy the output of the last message to my clipboard.

Environment Info

• Platform: darwin
• Terminal: tmux
• Version: 2.1.19
• Feedback ID: e3f0c277-5fb2-464d-9cc0-03e641a0f5fe

Errors

[{"error":"Error: ENOENT: no such file or directory, scandir '/Library/Application Support/ClaudeCode/.claude/skills'\n    at readdirSync (unknown)\n    at <anonymous> (/$bunfs/root/claude:12:1903)\n    at mW (/$bunfs/root/claude:11:35435)\n    at readdirSync (/$bunfs/root/claude:12:1864)\n    at ILR (/$bunfs/root/claude:2215:380)\n    at ILR (/$bunfs/root/claude:2215:1350)\n    at <anonymous> (/$bunfs/root/claude:2215:4440)\n    at <anonymous> (/$bunfs/root/claude:2215:5171)\n    at A (/$bunfs/root/claude:11:7259)\n    at FZ8 (/$bunfs/root/claude:4862:4342)","timestamp":"2026-01-26T20:13:44.857Z"},{"error":"Error: FileHistory: Failed to copy backup 80163a1c6a72366a@v1 on restore (backup file does not exist in 6898df0a-6877-41af-bacc-16d3b5d7b9a8)\n    at FJR (/$bunfs/root/claude:1751:11830)\n    at FJR (/$bunfs/root/claude:1751:12488)\n    at dr (/$bunfs/root/claude:1751:14229)\n    at async <anonymous> (/$bunfs/root/claude:6156:55)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-01-26T20:13:45.985Z"},{"error":"Error: LSP server plugin:pyright-lsp:pyright failed to start: Executable not found in $PATH: \"pyright-langserver\"\n    at start (/$bunfs/root/claude:2189:22300)\n    at async $ (/$bunfs/root/claude:2189:24752)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-01-26T20:13:46.252Z"},{"error":"Error: LSP server plugin:typescript-lsp:typescript failed to start: Executable not found in $PATH: \"typescript-language-server\"\n    at start (/$bunfs/root/claude:2189:22300)\n    at async $ (/$bunfs/root/claude:2189:24752)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-01-26T20:13:46.252Z"},{"error":"Error: Executable not found in $PATH: \"pyright-langserver\"\n    at spawn (unknown)\n    at spawn (node:child_process:667:35)\n    at spawn (node:child_process:14:39)\n    at start (/$bunfs/root/claude:2189:20845)\n    at start (/$bunfs/root/claude:2189:22354)\n    at $ (/$bunfs/root/claude:2189:24752)\n    at $ (/$bunfs/root/claude:2189:25727)\n    at _ (/$bunfs/root/claude:2189:32514)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-01-26T20:13:46.252Z"},{"error":"Error: Executable not found in $PATH: \"typescript-language-server\"\n    at spawn (unknown)\n    at spawn (node:child_process:667:35)\n    at spawn (node:child_process:14:39)\n    at start (/$bunfs/root/claude:2189:20845)\n    at start (/$bunfs/root/claude:2189:22354)\n    at $ (/$bunfs/root/claude:2189:24752)\n    at $ (/$bunfs/root/claude:2189:25727)\n    at _ (/$bunfs/root/claude:2189:32514)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-01-26T20:13:46.252Z"},{"error":"Error: Failed to start LSP server plugin:pyright-lsp:pyright: Executable not found in $PATH: \"pyright-langserver\"\n    at <anonymous> (/$bunfs/root/claude:2189:32536)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-01-26T20:13:46.252Z"},{"error":"Error: Failed to start LSP server plugin:typescript-lsp:typescript: Executable not found in $PATH: \"typescript-language-server\"\n    at <anonymous> (/$bunfs/root/claude:2189:32536)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-01-26T20:13:46.252Z"},{"error":"SyntaxError: JSON Parse error: Property name must be a string literal\n    at <parse> (:0)\n    at parse (unknown)\n    at <anonymous> (/$bunfs/root/claude:69:708)\n    at A (/$bunfs/root/claude:11:7259)\n    at EX8 (/$bunfs/root/claude:4307:5876)\n    at async SmB (/$bunfs/root/claude:4307:8662)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-01-26T20:13:46.510Z"},{"error":"Error: ENOENT: no such file or directory, scandir '/Library/Application Support/ClaudeCode/.claude/skills'\n    at readdirSync (unknown)\n    at <anonymous> (/$bunfs/root/claude:12:1903)\n    at mW (/$bunfs/root/claude:11:35435)\n    at readdirSync (/$bunfs/root/claude:12:1864)\n    at ILR (/$bunfs/root/claude:2215:380)\n    at ILR (/$bunfs/root/claude:2215:1350)\n    at <anonymous> (/$bunfs/root/claude:2215:4440)\n    at <anonymous> (/$bunfs/root/claude:2215:5171)\n    at A (/$bunfs/root/claude:11:7259)\n    at FZ8 (/$bunfs/root/claude:4862:4342)","timestamp":"2026-01-26T20:13:47.448Z"},{"error":"Error: Request was aborted.\n    at makeRequest (/$bunfs/root/claude:161:3940)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-01-26T20:15:43.831Z"}]