feat: auto-detect ollama models

.living_spec/stories/archive/05_persist_project_selection.md

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+# Story: Persist Project Selection
+
+## User Story
+**As a** User
+**I want** the application to remember the last project I opened
+**So that** I don't have to re-select the directory every time I restart the app.
+
+## Acceptance Criteria
+*   [ ] Backend: Use `tauri-plugin-store` (or simple JSON file) to persist `last_project_path`.
+*   [ ] Backend: On app startup, check if a saved path exists.
+*   [ ] Backend: If saved path exists and is valid, automatically load it into `SessionState`.
+*   [ ] Frontend: On load, check if backend has a project ready. If so, skip selection screen.
+*   [ ] Frontend: Add a "Close Project" button to clear the state and return to selection screen.
+
+## Out of Scope
+*   Managing a list of "Recent Projects" (just the last one is fine for now).