fix(css): drop aggressive word-break in link content

Global rule `main a, .markdown a { word-break: break-all }` broke
German words mid-character whenever the anchor wrapped non-URL content
(e.g. PostCard wraps title/excerpt in <a href>). Visible in PostOverview
as "schützt" → "sc / hützt", "überall" → "über / all".

Replaced with overflow-wrap: anywhere — still wraps long URLs softly,
but only when nothing else fits.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app.css

@@ -314,11 +314,13 @@ main a:not(.no-underline):not([class*="btn"]):hover {
     color: var(--color-himmel-600);
 }
 
-/* Lange URLs umbrechen, damit sie nicht über den Bildschirmrand ragen */
+/* Lange URLs/Links umbrechen ohne mitten im Wort zu trennen.
+ * `overflow-wrap: anywhere` bricht nur wenn nötig (lange URL), während das
+ * frühere `word-break: break-all` jedes Wort hackte — sichtbar bei
+ * Card-Links wie PostCard, wo der ganze Card-Text in einem `<a>` liegt. */
 main a,
 .markdown a {
-    overflow-wrap: break-word;
-    word-break: break-all;
+    overflow-wrap: anywhere;
 }
 
 main strong {