fix: allow contact form submission without email (optional field)

ui: make contact form name & email optional for anonymous messages

fix: mobile bugs - theme toggle clickable, stars/clouds visible

fix: center nav links relative to viewport, not nav-inner

style: widen nav layout, logo and buttons closer to edges

fix: center nav links on page, align with content area

fix: align nav-inner max-width with content container (1100px)

feat: theme follows system prefers-color-scheme by default

feat: add theme toggle animation, independent star twinkling, fluffy clouds

feat: remove social card, enhance starfield background

fix: display location on two lines (Houston, TX / Riverside, CA)

fix: update location to Houston, TX · Riverside, CA

fix: constrain logo size with max-width/height and HTML attributes

feat: use logo.png and auto-detect browser language

fix: update team avatars, names, and LinkedIn URLs