feat(copy): homepage editorial voice — v2.1.2

Items 2, 3, 5 from CMO QA pass (seq 4):
- module-cards: H2 'Research Modules' → 'Tools'; subtitle + all 6 card
  descriptions rewritten in editorial voice (removed reagent/laboratory framing)
- footer: About blurb → verdict-driven guide framing
- front-page: news section H2 'Latest Peptide Research' → 'What\'s new';
  subtitle updated to match editorial voice
  (CMO seq 2 reversed 'Briefing' to avoid vocabulary collision with newsletter)

Version: 2.1.1 → 2.1.2

footer.php

@@ -31,7 +31,7 @@
 						// Default footer content if no widgets.
 						if ( 1 === $i ) {
 							echo '<h3>' . esc_html__( 'About', 'peptide-starter' ) . '</h3>';
-							echo '<p>' . esc_html__( 'Peptide Repo is a comprehensive scientific database for peptide research.', 'peptide-starter' ) . '</p>';
+							echo '<p>' . esc_html__( 'Verdict-driven peptide guides for clinicians and informed readers. Clear about the evidence — including when there isn\'t any.', 'peptide-starter' ) . '</p>';
 						} elseif ( 2 === $i ) {
 							echo '<h3>' . esc_html__( 'Quick Links', 'peptide-starter' ) . '</h3>';
 							echo '<ul>';