feat: improve session navigation

src/javis/core/chat_service.py

@@ -72,6 +72,24 @@ class ChatService:
     def list_sessions(self) -> list[ChatSession]:
         return self.store.list_sessions()
 
+    def search_sessions(self, text: str) -> list[ChatSession]:
+        normalized = text.strip()
+        if not normalized:
+            raise ValueError("Für die Suche fehlt ein Text.")
+        return self.store.search_sessions(normalized)
+
+    def resolve_session(self, reference: str) -> LoadedSession:
+        session = self.store.resolve_unique_prefix(reference)
+        return self.load_session(session.id)
+
+    def rename_session(self, session_id: str, title: str) -> ChatSession:
+        normalized = " ".join(title.split()).strip()
+        if not normalized:
+            raise ValueError("Der Sitzungstitel darf nicht leer sein.")
+        if len(normalized) > 60:
+            normalized = f"{normalized[:59].rstrip()}…"
+        return self.store.rename_session(session_id, normalized)
+
     def load_session(self, session_id: str) -> LoadedSession:
         session = self.store.get_session(session_id)
         supports_session = getattr(self.provider, "supports_session", None)