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>

vite.config.ts

@@ -1,26 +1,26 @@
-import { defineConfig } from "vite";
-import react from "@vitejs/plugin-react";
 import tailwindcss from "@tailwindcss/vite";
 import { TanStackRouterVite } from "@tanstack/router-plugin/vite";
+import react from "@vitejs/plugin-react";
+import { defineConfig } from "vite";
 
 export default defineConfig({
-  plugins: [
-    TanStackRouterVite({
-      target: "react",
-      autoCodeSplitting: true,
-      routesDirectory: "./src/client/routes",
-      generatedRouteTree: "./src/client/routeTree.gen.ts",
-    }),
-    react(),
-    tailwindcss(),
-  ],
-  server: {
-    proxy: {
-      "/api": "http://localhost:3000",
-      "/uploads": "http://localhost:3000",
-    },
-  },
-  build: {
-    outDir: "dist/client",
-  },
+	plugins: [
+		TanStackRouterVite({
+			target: "react",
+			autoCodeSplitting: true,
+			routesDirectory: "./src/client/routes",
+			generatedRouteTree: "./src/client/routeTree.gen.ts",
+		}),
+		react(),
+		tailwindcss(),
+	],
+	server: {
+		proxy: {
+			"/api": "http://localhost:3000",
+			"/uploads": "http://localhost:3000",
+		},
+	},
+	build: {
+		outDir: "dist/client",
+	},
 });