chore(api): regenerate Document type with thumbnailUrl field

Reflects the new @JsonProperty getter on Document. Kept as a minimal
manual edit rather than a full regen because the running dev backend
belongs to the main workspace and swapping JARs there would be a
side effect on a parallel worktree's state. `npm run generate:api`
will converge on the same shape.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/src/lib/generated/api.ts

@@ -1386,6 +1386,7 @@ export interface components {
             thumbnailKey?: string;
             /** Format: date-time */
             thumbnailGeneratedAt?: string;
+            thumbnailUrl?: string;
             originalFilename: string;
             /** @enum {string} */
             status: "PLACEHOLDER" | "UPLOADED" | "TRANSCRIBED" | "REVIEWED" | "ARCHIVED";