Merge pull request 'feat(tmux): show window names in the status bar and pane titles on the border' (#107) from feat/tmux-window-and-pane-titles into main

Reviewed-on: #107

home/shell.nix

@@ -313,6 +313,14 @@ in
         extraConfig = ''
           set -g @catppuccin_flavor 'mocha'
           set -g @catppuccin_window_status_style 'rounded'
+          # Catppuccin's default window text is #T, the pane title, which every
+          # program in the pane is free to overwrite -- the shell writes the
+          # hostname, Claude Code writes its current task, and a hand-set window
+          # name never appears. Show the window name instead, falling back to the
+          # pane title when the window holds a single pane and the two carry the
+          # same information anyway.
+          set -g @catppuccin_window_text ' #{?#{==:#{window_panes},1},#T,#W}'
+          set -g @catppuccin_window_current_text ' #{?#{==:#{window_panes},1},#T,#W}'
         '';
       }
       resurrect # save/restore sessions
@@ -357,6 +365,17 @@ in
       set -g renumber-windows on
       set -g set-clipboard on
 
+      # Pane titles on the border, but only once a window is split -- a single
+      # pane's title is already in the status bar. pane-border-status takes no
+      # format, so the hook recomputes it whenever the layout changes, which
+      # covers both splitting and closing a pane.
+      set -g pane-border-format " #P #{pane_title} "
+      set -g pane-border-status off
+      set-hook -g window-layout-changed 'set -Fw pane-border-status "#{?#{>:#{window_panes},1},top,off}"'
+
+      # Pane titles have no default binding.
+      bind T command-prompt -p "pane title:" "select-pane -T '%%'"
+
       # Catppuccin v2 statusline. Must run after the plugin has loaded;
       # home-manager appends this extraConfig after the whole plugin list.
       set -g status-left-length 100