Extends Button.astro with a center prop, native <button> element support
(type, disabled, aria-describedby), harmonised padding (.65rem), and
transition. Removes global .button, .button-small, .button-light, and
.button-center rules from components.css, layout.css, and typography.css.
Converts all inline class="button" usages across Header, HomeHero,
HomeFinancialHelp, HomeServicesIntro, FormShell, TeamPage, CareersPage,
and FaqPage to the <Button> component. Updates three scoped style
selectors to :global() to reach the child component's elements.
Additional info:
- move page-specific shells into src/components/pages/
- keep reusable building blocks and home sections in their existing component folders
- update PageLayout and the home route imports to the new page-shell paths
- preserve current page behavior while making the component tree easier to navigate