herdr: move config to prdlk/herdr external; document OSC 8 links

docs/terminal/tmux.mdx

@@ -19,7 +19,7 @@ The prefix is `ctrl+b` (the byte Ghostty's `ctrl+shift` chords send). `ctrl+spac
 
 | Option | Value |
 | --- | --- |
-| `default-terminal` | `tmux-256color`; `RGB` override for every terminal; `clipboard` feature; `extkeys` for xterm-kitty |
+| `default-terminal` | `tmux-256color`; `RGB` override for every terminal; `clipboard` and `hyperlinks` (OSC 8) features; `extkeys` for xterm-kitty. Features apply after `tmux kill-server` |
 | `extended-keys` | `on`, format `csi-u` |
 | `base-index` / `pane-base-index` | `1` / `1`; `renumber-windows on` |
 | `status-position` | `top`, `status-interval 5` |
@@ -49,6 +49,7 @@ These settings are what [yazi](/tools/yazi) needs inside tmux. `allow-passthroug
 | `prefix h` / `prefix v` | Split below / right, pane cwd |
 | `prefix x` | Kill pane |
 | `S-Enter` (no prefix) | Sends `ESC[13;2u` to the pane unchanged. With `extended-keys on`, tmux would otherwise turn Shift+Enter into plain Enter for apps that never requested extended keys, and coding agents (omp, Claude Code) would submit instead of inserting a newline |
+| `C-MouseDown1Pane` (ctrl+click) | Opens the OSC 8 hyperlink under the mouse (`#{mouse_hyperlink}`) with `xdg-open` (`open` on macOS); without one, the click goes to the pane. Plain-text URLs: `ctrl+shift+click`, handled by Ghostty |
 | `M-Enter` / `M-S-Enter` / `M-Escape` (no prefix) | Split below / split right / kill pane |
 | `C-h` / `C-j` / `C-k` / `C-l` (no prefix) | Vim-aware pane focus. In an nvim/vim/fzf pane (`@pane-is-vim`, set by smart-splits, or the pane's command), the key goes to nvim. nvim's `config.pane_nav` moves between its own splits and, at its outer edge, runs `tmux select-pane -t $TMUX_PANE`. Elsewhere tmux moves directly. Also bound in copy mode |
 | `prefix C-l` | Send `C-l` (clear screen) |