style: apply Biome formatting and auto-fixes

- Format 78 files, fixed 42 files total
- Apply safe lint fixes (non-null assertions converted to optional chaining)
- Remaining lint warnings are non-blocking (test code, a11y suggestions)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

packages/ui/src/Button/Button.test.tsx

@@ -119,9 +119,7 @@ describe("Button", () => {
 		});
 
 		it("applies icon size classes", () => {
-			render(
-				<Button size="icon" data-testid="button" aria-label="Icon button" />,
-			);
+			render(<Button size="icon" data-testid="button" aria-label="Icon button" />);
 			const button = screen.getByTestId("button");
 			expect(button.className).toContain("h-10");
 			expect(button.className).toContain("w-10");
@@ -241,19 +239,14 @@ describe("Button", () => {
 				</Button>,
 			);
 			expect(ref).toBeInstanceOf(HTMLButtonElement);
-			expect(ref!.tagName).toBe("BUTTON");
+			expect(ref?.tagName).toBe("BUTTON");
 		});
 	});
 
 	describe("HTML Attributes", () => {
 		it("passes through HTML button attributes", () => {
 			render(
-				<Button
-					type="submit"
-					name="test-button"
-					value="test-value"
-					data-testid="button"
-				>
+				<Button type="submit" name="test-button" value="test-value" data-testid="button">
 					Submit
 				</Button>,
 			);

packages/ui/src/Button/variants.ts

@@ -65,11 +65,9 @@ export const buttonVariants = createVariants({
 				"active:bg-accent/80",
 			].join(" "),
 
-			link: [
-				"text-primary underline-offset-4",
-				"hover:underline",
-				"active:text-primary/80",
-			].join(" "),
+			link: ["text-primary underline-offset-4", "hover:underline", "active:text-primary/80"].join(
+				" ",
+			),
 		},
 
 		size: {