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/components/ui/tooltip/index.ts

@@ -1,6 +1,6 @@
-import { Tooltip as TooltipPrimitive } from "bits-ui";
-import Trigger from "./tooltip-trigger.svelte";
-import Content from "./tooltip-content.svelte";
+import { Tooltip as TooltipPrimitive } from 'bits-ui';
+import Trigger from './tooltip-trigger.svelte';
+import Content from './tooltip-content.svelte';
 
 const Root = TooltipPrimitive.Root;
 const Provider = TooltipPrimitive.Provider;
@@ -17,5 +17,5 @@ export {
 	Content as TooltipContent,
 	Trigger as TooltipTrigger,
 	Provider as TooltipProvider,
-	Portal as TooltipPortal,
+	Portal as TooltipPortal
 };