style(footer): tone down the wordmark size and drop the trailing dot

[jigarkhwar]

What changed

Two tweaks to the giant "Galaxio" wordmark in the footer, per feedback that it read as oversized and the trailing dot looked unnecessary:

1. Size — `font-size: clamp(96px, 18vw, 320px)` → `clamp(72px, 13vw, 200px)`. The old cap (320px) was more than double the hero headline's own max (148px), making the footer signature the single biggest thing on the page by a wide margin. Still a prominent closing flourish, just no longer dwarfing everything else.
2. Dot — dropped the trailing `` (and its now-unused CSS rule). It was carried over from the hero headline's "parts." treatment, but sitting alone after a wordmark with no sentence/punctuation context, it read as an unexplained ornament rather than a period.

Only `.footer-wordmark`'s own dot is touched — `.hero-headline .dot` (the "parts.") is untouched.

Verification

• 390px: wordmark renders as "Galaxio" (no dot), proportionate size.
• 1650px: `getComputedStyle` confirms `font-size: 200px` (down from 320px) and `textContent` is `"Galaxio"` with no dot character.
• `astro build` passes.

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