chore: Add custom status line configuration

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.claude/settings.json

@@ -1,5 +1,9 @@
 {
   "enabledPlugins": {
     "ab@roa2web-tools": true
+  },
+  "statusLine": {
+    "type": "command",
+    "command": "input=$(cat); model=$(echo \"$input\" | jq -r '.model.display_name // \"Unknown\"'); usage=$(echo \"$input\" | jq '.context_window.current_usage'); if [ \"$usage\" != \"null\" ]; then current=$(echo \"$usage\" | jq '.input_tokens + .cache_creation_input_tokens + .cache_read_input_tokens'); size=$(echo \"$input\" | jq '.context_window.context_window_size'); pct=$((current * 100 / size)); ctx=$(printf '%d%% ctx' \"$pct\"); else ctx='0% ctx'; fi; branch=$(git -c core.useBuiltinFSMonitor=false branch --show-current 2>/dev/null || echo 'no-git'); cwd=$(basename \"$(pwd)\"); printf '\\033[36m%s\\033[0m | \\033[33m%s\\033[0m | \\033[32m%s\\033[0m | \\033[35m%s\\033[0m' \"$model\" \"$ctx\" \"$branch\" \"$cwd\""
   }
 }