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/client/components/CategoryPicker.tsx

@@ -1,8 +1,5 @@
 import { useEffect, useRef, useState } from "react";
-import {
-	useCategories,
-	useCreateCategory,
-} from "../hooks/useCategories";
+import { useCategories, useCreateCategory } from "../hooks/useCategories";
 import { LucideIcon } from "../lib/iconData";
 import { IconPicker } from "./IconPicker";
 
@@ -109,10 +106,7 @@ export function CategoryPicker({ value, onChange }: CategoryPickerProps) {
 					handleConfirmCreate();
 				} else if (highlightIndex >= 0 && highlightIndex < filtered.length) {
 					handleSelect(filtered[highlightIndex].id);
-				} else if (
-					showCreateOption &&
-					highlightIndex === filtered.length
-				) {
+				} else if (showCreateOption && highlightIndex === filtered.length) {
 					handleStartCreate();
 				}
 				break;
@@ -162,11 +156,7 @@ export function CategoryPicker({ value, onChange }: CategoryPickerProps) {
 							: undefined
 					}
 					value={
-						isOpen
-							? inputValue
-							: selectedCategory
-								? selectedCategory.name
-								: ""
+						isOpen ? inputValue : selectedCategory ? selectedCategory.name : ""
 					}
 					placeholder="Search or create category..."
 					onChange={(e) => {
@@ -188,14 +178,12 @@ export function CategoryPicker({ value, onChange }: CategoryPickerProps) {
 				<ul
 					ref={listRef}
 					id="category-listbox"
-					role="listbox"
 					className="absolute z-20 mt-1 w-full max-h-48 overflow-auto bg-white border border-gray-200 rounded-lg shadow-lg"
 				>
 					{filtered.map((cat, i) => (
 						<li
 							key={cat.id}
 							id={`category-option-${i}`}
-							role="option"
 							aria-selected={cat.id === value}
 							className={`px-3 py-2 text-sm cursor-pointer flex items-center gap-1.5 ${
 								i === highlightIndex
@@ -216,7 +204,6 @@ export function CategoryPicker({ value, onChange }: CategoryPickerProps) {
 					{showCreateOption && !isCreating && (
 						<li
 							id={`category-option-${filtered.length}`}
-							role="option"
 							aria-selected={false}
 							className={`px-3 py-2 text-sm cursor-pointer border-t border-gray-100 ${
 								highlightIndex === filtered.length