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.

references/recap/pattern2-thinking.md

@@ -0,0 +1,33 @@
+# Card 2 Thinking Retrieval
+
+Goal: find turning points. This card is not a project timeline and not an implementation log. It is the record of what changed in the user's mind.
+
+Retrieve 3-6 turns. A turn needs both sides:
+
+- the user question, friction, doubt, or request that started the turn;
+- the later decision, reframing, finding, or constraint that replaced the earlier
+  state.
+
+Useful searches:
+
+- user questions in the period: "为什么", "是不是", "怎么", "我觉得", "不应该";
+- places where the user corrected the direction and then approved a new frame;
+- summaries that name decisions, followed by `context()` or `thread()` for the
+  user's actual words;
+- memory records only as hints; raw session evidence must provide the prompt and
+  turn.
+
+Prefer helpers first. If you need custom SQL for message windows or user-turn
+counts, read `references/schema.md` before writing the SQL.
+
+Do not use workflow names, feature names, or agent task labels as prompts when
+the user had their own wording. Do not use counts, "5 rounds", "13 agents", or
+implementation effort as turns unless that count is the turn itself.
+
+Read this card's writing file immediately after the turns are chosen:
+`references/recap/writing2-thinking.md`. Then update the JSON `thinking_path`
+card and add evidence for each item.
+Do not read `pattern3-vibe.md` until this JSON update is done.
+
+Stop when each item has a source-language prompt label, a short changed-state
+prompt, turn, and an `evidence` anchor.