fix: resolve all lint errors across source and test files

- Fix unused function parameters (prefix with _)
- Fix unused imports in test files
- Fix import ordering in test files
- Auto-fix formatting issues across 22 files

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

src/db/dev-seed.ts

@@ -6,12 +6,11 @@ import { and, eq } from "drizzle-orm";
 import {
 	DEV_CATEGORIES,
 	DEV_GLOBAL_ITEMS,
-	DEV_SETUPS,
 	DEV_SETTINGS,
+	DEV_SETUPS,
 	DEV_TAG_ASSIGNMENTS,
 	DEV_THREADS,
 	DEV_USER_ITEMS,
-	categoryDisplayName,
 } from "./dev-seed-data.ts";
 import { db } from "./index.ts";
 import * as schema from "./schema.ts";
@@ -106,7 +105,10 @@ async function seedDevData(database: Db = db) {
 						description: item.description,
 					})
 					.returning();
-				if (!inserted) throw new Error(`Failed to insert global item: ${item.brand} ${item.model}`);
+				if (!inserted)
+					throw new Error(
+						`Failed to insert global item: ${item.brand} ${item.model}`,
+					);
 				globalItemIds.push(inserted.id);
 				newGlobalCount++;
 			}
@@ -185,7 +187,8 @@ async function seedDevData(database: Db = db) {
 					userId,
 				})
 				.returning();
-			if (!thread) throw new Error(`Failed to insert thread: ${threadDef.name}`);
+			if (!thread)
+				throw new Error(`Failed to insert thread: ${threadDef.name}`);
 			threadResults.push({ threadId: thread.id, threadDef });
 		}
 		console.log(`  ${threadResults.length} threads created.`);