Fixed every touch target on the site

Went through every interactive element on the site and made sure they all hit the 44x44px WCAG minimum. Scroll buttons, month navigation, dropdown items, footer links, back buttons — all of them were undersized. Also added a proper mobile hamburger menu with backdrop overlay, bumped the tag label font from 10px to 12px because that was below readable size, and constrained line lengths on service pages so text doesn't run edge to edge on tablets. Six accessibility bugs squashed in one pass.