feat(app): add Settings view, configurable claude dir, and recap docs refactor

Introduce a Settings view for configuring the Claude data directory
  (with WSL auto-detection on Windows), sidebar project grouping module,
  and an empty-state onboarding screen for SessionList. Refactor
  recap-patterns.md into per-card reference files under references/recap/
  with separate retrieval and writing guides. Remove the legacy panel.html.
  On the data layer: incremental indexing via changedPaths, per-session
  live-update IPC (obelisk:session-updated), and session dirty-tracking
  in the renderer.

app/recap-capture-query.js

@@ -0,0 +1,18 @@
+const path = require('path');
+
+function cleanRecapFilename(filename) {
+  if (!filename) return '';
+  return path.basename(String(filename));
+}
+
+function buildRecapExportQuery({ cardIdx = 0, archetype = '', filename = '' } = {}) {
+  const params = new URLSearchParams();
+  const cardNumber = Number(cardIdx);
+  params.set('card', Number.isFinite(cardNumber) ? String(cardNumber) : '0');
+  if (archetype) params.set('arch', String(archetype));
+  const safeFilename = cleanRecapFilename(filename);
+  if (safeFilename) params.set('file', safeFilename);
+  return params.toString();
+}
+
+module.exports = { buildRecapExportQuery, cleanRecapFilename };