feat(tmux): inline tab-name format, remove script

Replace external tab-name.sh with a tmux format string that
shows pane_current_path for shell processes and
pane_current_command otherwise, truncated to 15 chars.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

home/.tmux/tab-name.sh

@@ -1,29 +0,0 @@
-#!/usr/bin/env bash
-# Tab name for tmux automatic-rename.
-# Usage: tab-name.sh <command> <dirname>
-# Shows dirname for shells, command for everything else. Truncates at 15 with ….
-
-cmd="$1"
-dir="$2"
-max=15
-
-case "$cmd" in
-    zsh|bash|fish|sh) name="$dir" ;;
-    *) name="$cmd" ;;
-esac
-
-# In Codespaces, show friendly name without trailing random ID
-# Codespace names: "adjective-noun-id" where id is alphanumeric gibberish
-if [[ -n "$CODESPACE_NAME" ]]; then
-    friendly="${CODESPACE_NAME%-*}"
-    # If no hyphen was found, use full name
-    [[ "$friendly" == "$CODESPACE_NAME" ]] && friendly="$CODESPACE_NAME"
-    echo "cs:${friendly}"
-    exit 0
-fi
-
-if (( ${#name} > max )); then
-    echo "${name:0:$max}…"
-else
-    echo "$name"
-fi