fix(downloads): clip long titles to fit display_name (VARCHAR 255)

A download whose source title exceeded 255 chars (e.g. a recipe baked into a
Facebook video's title) failed with a StringDataRightTruncation: the worker
auto-fills an empty display_name from the title, which overflows the 255-char
column. Clip the title to 255 at every point it flows into display_name (worker
completion paths + enqueue); the full title is untouched on the asset. Pre-existing
latent bug, surfaced by an unusually long title.

Release v0.31.1.

frontend/src/lib/releaseNotes.ts

@@ -14,6 +14,14 @@ export interface ReleaseEntry {
 }
 
 export const RELEASE_NOTES: ReleaseEntry[] = [
+  {
+    version: "0.31.1",
+    date: "2026-07-07",
+    summary: "Fix: a download could fail when the video's title was very long.",
+    fixes: [
+      "Downloads: fixed a download failing right at the end when the source's title was very long (e.g. a whole recipe in the title) — the auto-filled display name overflowed its limit. Long titles are now trimmed for the name; the full title still shows everywhere else.",
+    ],
+  },
   {
     version: "0.31.0",
     date: "2026-07-07",