chore: auto-fix Biome formatting and configure lint rules

Run biome check --write --unsafe to fix tabs, import ordering, and
non-null assertions across entire codebase. Disable a11y rules not
applicable to this single-user app. Exclude auto-generated routeTree.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/shared/types.ts

@@ -1,19 +1,26 @@
 import type { z } from "zod";
 import type {
-  createItemSchema,
-  updateItemSchema,
-  createCategorySchema,
-  updateCategorySchema,
-  createThreadSchema,
-  updateThreadSchema,
-  createCandidateSchema,
-  updateCandidateSchema,
-  resolveThreadSchema,
-  createSetupSchema,
-  updateSetupSchema,
-  syncSetupItemsSchema,
+	categories,
+	items,
+	setupItems,
+	setups,
+	threadCandidates,
+	threads,
+} from "../db/schema.ts";
+import type {
+	createCandidateSchema,
+	createCategorySchema,
+	createItemSchema,
+	createSetupSchema,
+	createThreadSchema,
+	resolveThreadSchema,
+	syncSetupItemsSchema,
+	updateCandidateSchema,
+	updateCategorySchema,
+	updateItemSchema,
+	updateSetupSchema,
+	updateThreadSchema,
 } from "./schemas.ts";
-import type { items, categories, threads, threadCandidates, setups, setupItems } from "../db/schema.ts";
 
 // Types inferred from Zod schemas
 export type CreateItem = z.infer<typeof createItemSchema>;