chore: format the tree and clear ruff's findings

Applies ruff format, ruff check --fix and prettier, so CI can gate on all three.
The surviving unused imports were all re-exports in __init__.py, now covered by a
per-file ignore; the pdf.js viewer and the generated openapi types join the
vendored code that eslint and prettier already skip.

frontend/src/lib/state/library.svelte.ts

@@ -32,9 +32,12 @@ export class LibraryState {
 		this.activeLibrary = this.libraries.find((lib) => lib.id === libraryId) || this.libraries[0];
 		if (browser) {
 			localStorage.setItem('previousLibraryId', this.activeLibrary.id.toString());
-			await goto(resolve('/(root)/(library)/library/[libraryId]/view', { libraryId: String(libraryId) }), {
-				invalidate: ['app:libraries']
-			});
+			await goto(
+				resolve('/(root)/(library)/library/[libraryId]/view', { libraryId: String(libraryId) }),
+				{
+					invalidate: ['app:libraries']
+				}
+			);
 		}
 	}