feat(claude): add zellij tab activity indicators

Shows Claude status in zellij tab name:
- 🔄 during tool use
- 🟥 on permission request
- 🟢 when stopped
- Branch name in worktrees, folder name otherwise

Author: denolfe

claude/hooks/zellij-activity.sh

@@ -0,0 +1,82 @@
+#!/bin/bash
+# Displays Claude Code activity status in Zellij tab name
+#
+# Required ~/.claude/settings.json hooks configuration:
+#
+#   "hooks": {
+#     "SessionStart": [{ "matcher": "", "hooks": ["/path/to/zellij-activity.sh"] }],
+#     "PreToolUse": [{ "matcher": "", "hooks": ["/path/to/zellij-activity.sh"] }],
+#     "PermissionRequest": [{ "matcher": "", "hooks": ["/path/to/zellij-activity.sh"] }],
+#     "Stop": [{ "matcher": "", "hooks": ["/path/to/zellij-activity.sh"] }],
+#     "SessionEnd": [{ "matcher": "", "hooks": ["/path/to/zellij-activity.sh"] }]
+#   }
+
+[[ -z "$ZELLIJ" ]] && exit 0
+
+input=$(cat)
+
+hook_type=$(echo "$input" | jq -r '.hook_event_name // empty')
+cwd=$(echo "$input" | jq -r '.cwd // .session.cwd // empty')
+
+state_file="/tmp/zellij-claude-tab-${ZELLIJ_PANE_ID}"
+
+set_base_name() {
+  local base_name=""
+
+  if [[ -n "$cwd" ]]; then
+    cd "$cwd" 2>/dev/null || return
+    git_path=$(git rev-parse --git-dir 2>/dev/null)
+    if [[ "$git_path" =~ \.git/worktrees/ ]]; then
+      base_name=$(git rev-parse --abbrev-ref HEAD 2>/dev/null)
+    fi
+  fi
+
+  [[ -z "$base_name" || "$base_name" == "HEAD" ]] && base_name=$(basename "${cwd:-$PWD}")
+
+  echo "$base_name" > "$state_file"
+  echo "$base_name"
+}
+
+get_base_name() {
+  if [[ -f "$state_file" ]]; then
+    cat "$state_file"
+  else
+    set_base_name
+  fi
+}
+
+rename_tab() {
+  local name="$1"
+  zellij action rename-tab "$name" 2>/dev/null
+}
+
+case "$hook_type" in
+  SessionStart)
+    base_name=$(set_base_name)
+    rename_tab "$base_name"
+    ;;
+  PreToolUse)
+    tool_name=$(echo "$input" | jq -r '.tool_name // empty')
+    base_name=$(get_base_name)
+    if [[ "$tool_name" == "AskUserQuestion" ]]; then
+      rename_tab "❓ $base_name"
+    else
+      rename_tab "🔄 $base_name"
+    fi
+    ;;
+  PermissionRequest)
+    tool_name=$(echo "$input" | jq -r '.tool_name // empty')
+    [[ "$tool_name" == "AskUserQuestion" ]] && exit 0
+    base_name=$(get_base_name)
+    rename_tab "🔴 $base_name"
+    ;;
+  Stop)
+    base_name=$(get_base_name)
+    rename_tab "🟢 $base_name"
+    ;;
+  SessionEnd)
+    base_name=$(get_base_name)
+    rename_tab "$base_name"
+    rm -f "$state_file"
+    ;;
+esac