fix: strip dates/UUIDs in filenames even when adjacent to underscores

Word-boundary (\b) anchors don't fire next to underscores, so
already-processed names like 2026-07-24_2026-07-24-<uuid>_30x40 kept
their doubled date prefix. Drop \b; match dates/hex globally.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XNQ8ghPfzAfsyVYd6HgFb6

src/lib/pipeline.ts

@@ -97,9 +97,10 @@ const GENERIC = new Set(['', 'foto', 'photo', 'bild', 'image', 'img', 'telegram'
  *  Datumspräfixe, UUIDs und lange Hex-Ketten entfernen, damit keine Doppelungen entstehen. */
 function cleanMotif(name: string | null): string {
   let s = (name || '').replace(/\.[^.]+$/, '');
-  s = s.replace(/\b\d{4}-\d{2}-\d{2}\b/g, ' ');                                            // Datum
+  // Ohne \b arbeiten — Wortgrenzen greifen an Unterstrichen nicht (…_2026-07-24…).
   s = s.replace(/[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}/gi, ' ');    // UUID
-  s = s.replace(/\b[0-9a-f]{16,}\b/gi, ' ');                                               // lange Hex-Ketten
+  s = s.replace(/\d{4}-\d{2}-\d{2}/g, ' ');                                                // Datum (auch mehrfach)
+  s = s.replace(/[0-9a-f]{16,}/gi, ' ');                                                   // lange Hex-Ketten
   return slugify(s);
 }