refactor(theme): make light mode the default shell

tests/legacy-design-migration.test.ts

@@ -21,8 +21,11 @@ describe("legacy design migration", () => {
 		expect(layout).not.toContain("Local iCal");
 		expect(layout).not.toContain("editor for calendar events");
 		expect(layout).not.toContain("glass-strong");
+		expect(layout).toContain('defaultTheme="light"');
+		expect(layout).toContain("enableColorScheme");
 		expect(manifest).not.toContain("local-ical");
 		expect(manifest).not.toContain("Local iCal editor");
+		expect(manifest).toContain('theme_color: "#ffffff"');
 	});
 
 	test("auth screens use console surfaces instead of old glass cards", () => {