fix(podcast): lille omslag i link-forhåndsvisningen

Med det store omslag (3000 px) viste Messenger et kvadratisk billede i hele
beskedens bredde. Forhåndsvisningen bruger nu cover-lille.jpg (300 px), når
den findes, så den vises som en miniature ved teksten.

Claude-Session: https://claude.ai/code/session_012LCTmU2ewo8tnM1dByYAoG

main.py

@@ -457,9 +457,14 @@ async def podcast_faelles_side(request: Request, key: str):
     base = str(request.base_url).rstrip("/")
     udsendelser = _podcast_kontekst(request, rod, med_kladder=False)
     s = udsendelser[0] if udsendelser else {"titel": "Podcast", "slug": "", "har_cover": False}
+    # Et lille omslag (300 px), så Messenger viser en miniature ved teksten i
+    # stedet for et billede i hele beskedens bredde.
+    lille = bool(s.get("slug")) and podcast.cover(s["slug"], lille=True) is not None
     og = {"titel": s["titel"], "url": f"{base}{rod}/",
           "beskrivelse": "Familiens podcast. Lyt i browseren, eller abonnér i din podcast-app.",
-          "billede": f"{base}{rod}/{s['slug']}/cover.jpg" if s.get("har_cover") else ""}
+          "billede": (f"{base}{rod}/{s['slug']}/cover-lille.jpg" if lille else
+                      f"{base}{rod}/{s['slug']}/cover.jpg" if s.get("har_cover") else ""),
+          "str": 300 if lille else 3000}
     headers = {"X-Robots-Tag": "noindex, nofollow, noarchive", "Referrer-Policy": "no-referrer",
                "Cache-Control": "private, no-store"}
     if forhaandsvisning:
@@ -491,6 +496,14 @@ async def podcast_faelles_feed(request: Request, key: str, name: str):
                     headers={"Cache-Control": "private, max-age=300", "X-Robots-Tag": "noindex, nofollow"})
 
 
+@app.get("/podcast/f/{key}/{name}/cover-lille.jpg")
+async def podcast_faelles_cover_lille(request: Request, key: str, name: str):
+    p = podcast.cover(name, lille=True)
+    if podcast.blokeret(_klient_ip(request)) or not podcast.faelles_slaa_op(key) or not p:
+        _ikke_fundet(request)
+    return FileResponse(p, media_type="image/jpeg", headers={"Cache-Control": "private, max-age=86400"})
+
+
 @app.get("/podcast/f/{key}/{name}/cover.jpg")
 async def podcast_faelles_cover(request: Request, key: str, name: str):
     p = podcast.cover(name)

podcast.py

@@ -115,8 +115,9 @@ def saet_kladde(name: str, slug: str, kladde: bool) -> bool:
     return True
 
 
-def cover(name: str) -> Path | None:
+def cover(name: str, lille: bool = False) -> Path | None:
-    p = ROOT / name / "cover.jpg"
+    """Omslaget; lille = 300 px-udgaven til link-forhåndsvisninger (cover-lille.jpg)."""
+    p = ROOT / name / ("cover-lille.jpg" if lille else "cover.jpg")
     return p if SHOW.match(name or "") and p.exists() else None
 
 

templates/podcast_og.html

@@ -11,8 +11,8 @@
 <meta property="og:url" content="{{ og.url }}">
 <meta property="og:locale" content="da_DK">
 {% if og.billede %}<meta property="og:image" content="{{ og.billede }}">
-<meta property="og:image:width" content="3000">
+<meta property="og:image:width" content="{{ og.str }}">
-<meta property="og:image:height" content="3000">
+<meta property="og:image:height" content="{{ og.str }}">
 <meta name="twitter:card" content="summary">{% endif %}
 </head>
 <body><h1>{{ og.titel }}</h1><p>{{ og.beskrivelse }}</p></body>