Add sorting by date or name

Adds a sort dropdown offering newest/oldest first and name A-Z/Z-A.
Sorting applies to plain listings, text search, and semantic search
results, and the sidebar facet links preserve the current choice.
Invalid sort values fall back to the default.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/main.py

@@ -75,6 +75,28 @@ def facets(db: Session, user: User) -> dict:
     }
 
 
+# Auswahl für die Sortierung: Wert -> Beschriftung in der Oberfläche.
+SORT_OPTIONS = {
+    "date_desc": "Neueste zuerst",
+    "date_asc": "Älteste zuerst",
+    "name_asc": "Name A–Z",
+    "name_desc": "Name Z–A",
+}
+DEFAULT_SORT = "date_desc"
+
+
+def sort_links(links: list[Link], sort: str) -> list[Link]:
+    if sort == "date_asc":
+        return sorted(links, key=lambda link: link.created_at)
+    if sort == "name_asc":
+        return sorted(links, key=lambda link: (link.title or link.url).lower())
+    if sort == "name_desc":
+        return sorted(
+            links, key=lambda link: (link.title or link.url).lower(), reverse=True
+        )
+    return sorted(links, key=lambda link: link.created_at, reverse=True)
+
+
 def query_links(
     db: Session,
     user: User,
@@ -82,6 +104,7 @@ def query_links(
     category: str = "",
     manufacturer: str = "",
     semantic: bool = False,
+    sort: str = DEFAULT_SORT,
 ) -> list[Link]:
     stmt = select(Link).where(Link.user_id == user.id)
     if category:
@@ -92,18 +115,18 @@ def query_links(
 
     q = (q or "").strip()
     if not q:
-        return links
+        return sort_links(links, sort)
 
     if semantic and config.AI_ENABLED:
         query_vec = ai.embed(q)
         ranked = search.cosine_rank(query_vec, links)
         result = [link for link, score in ranked if score > 0.20][:50]
         if result:
-            return result
+            return sort_links(result, sort)
         # Fallback auf Textsuche, falls keine Embeddings vorhanden sind.
 
     ql = q.lower()
-    return [
+    matches = [
         link
         for link in links
         if ql
@@ -111,6 +134,7 @@ def query_links(
             [link.title, link.summary, link.tags, link.category, link.manufacturer]
         ).lower()
     ]
+    return sort_links(matches, sort)
 
 
 # ---------------------------------------------------------------------------
@@ -192,14 +216,17 @@ def index(
     category: str = "",
     manufacturer: str = "",
     semantic: str = "",
+    sort: str = DEFAULT_SORT,
     db: Session = Depends(get_db),
 ):
     user = current_user(request, db)
     if not user:
         return RedirectResponse("/login", status_code=303)
 
+    if sort not in SORT_OPTIONS:
+        sort = DEFAULT_SORT
     is_semantic = semantic in ("1", "on", "true")
-    links = query_links(db, user, q, category, manufacturer, is_semantic)
+    links = query_links(db, user, q, category, manufacturer, is_semantic, sort)
     return templates.TemplateResponse(
         "index.html",
         {
@@ -212,6 +239,8 @@ def index(
             "active_manufacturer": manufacturer,
             "semantic": is_semantic,
             "ai_enabled": config.AI_ENABLED,
+            "sort": sort,
+            "sort_options": SORT_OPTIONS,
         },
     )
 
@@ -223,14 +252,17 @@ def search_links(
     category: str = "",
     manufacturer: str = "",
     semantic: str = "",
+    sort: str = DEFAULT_SORT,
     db: Session = Depends(get_db),
 ):
     user = current_user(request, db)
     if not user:
         return Response(status_code=401, headers={"HX-Redirect": "/login"})
 
+    if sort not in SORT_OPTIONS:
+        sort = DEFAULT_SORT
     is_semantic = semantic in ("1", "on", "true")
-    links = query_links(db, user, q, category, manufacturer, is_semantic)
+    links = query_links(db, user, q, category, manufacturer, is_semantic, sort)
     return templates.TemplateResponse(
         "_links_list.html", {"request": request, "links": links}
     )