style(project): format Go with gofmt, set up Prettier for the frontend

Run gofmt -w across the backend, normalising the manually-aligned := blocks
to the gofmt standard. No code behaviour changes.

Add Prettier (+ prettier-plugin-svelte) to the frontend with the SvelteKit
default config (tabs, single quotes) so formatting is reproducible, then run
it over the whole tree. Add format / format:check npm scripts and a
.prettierignore (build output, generated schema.ts, static assets).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/lib/stores/appSettings.ts

@@ -8,7 +8,7 @@ export interface AppSettings {
 
 const DEFAULTS: AppSettings = {
 	fileLoadLimit: 100,
-	tagRuleApplyToExisting: false,
+	tagRuleApplyToExisting: false
 };
 
 function load(): AppSettings {
@@ -25,4 +25,4 @@ export const appSettings = writable<AppSettings>(load());
 
 appSettings.subscribe((v) => {
 	if (browser) localStorage.setItem('app-settings', JSON.stringify(v));
-});
+});

frontend/src/lib/stores/auth.ts

@@ -31,4 +31,4 @@ authStore.subscribe((state) => {
 	}
 });
 
-export const isAuthenticated = derived(authStore, ($auth) => !!$auth.accessToken);
+export const isAuthenticated = derived(authStore, ($auth) => !!$auth.accessToken);

frontend/src/lib/stores/selection.ts

@@ -8,7 +8,7 @@ interface SelectionState {
 function createSelectionStore() {
 	const { subscribe, update, set } = writable<SelectionState>({
 		active: false,
-		ids: new Set(),
+		ids: new Set()
 	});
 
 	return {
@@ -55,11 +55,11 @@ function createSelectionStore() {
 
 		clear() {
 			set({ active: false, ids: new Set() });
-		},
+		}
 	};
 }
 
 export const selectionStore = createSelectionStore();
 
 export const selectionCount = derived(selectionStore, ($s) => $s.ids.size);
-export const selectionActive = derived(selectionStore, ($s) => $s.active);
+export const selectionActive = derived(selectionStore, ($s) => $s.active);

frontend/src/lib/stores/sorting.ts

@@ -29,30 +29,30 @@ function makeSortStore<F extends string>(key: string, defaults: SortState<F>) {
 		},
 		toggleOrder() {
 			store.update((s) => ({ ...s, order: s.order === 'asc' ? 'desc' : 'asc' }));
-		},
+		}
 	};
 }
 
 export const fileSorting = makeSortStore<FileSortField>('sort:files', {
 	sort: 'created',
-	order: 'desc',
+	order: 'desc'
 });
 
 export const tagSorting = makeSortStore<TagSortField>('sort:tags', {
 	sort: 'created',
-	order: 'desc',
+	order: 'desc'
 });
 
 export type CategorySortField = 'name' | 'color' | 'created';
 
 export const categorySorting = makeSortStore<CategorySortField>('sort:categories', {
 	sort: 'name',
-	order: 'asc',
+	order: 'asc'
 });
 
 export type PoolSortField = 'name' | 'created';
 
 export const poolSorting = makeSortStore<PoolSortField>('sort:pools', {
 	sort: 'created',
-	order: 'desc',
-});
+	order: 'desc'
+});