fix: darken muted text for WCAG AA contrast and trim home meta description

Change --color-text-muted from #a8a29e (2.52:1) to #78716c (4.62:1)
fixing contrast failures on footer, inactive tabs, and helper text.
Shorten home meta description to under 150 chars to prevent truncation.

Author: caio-pizzol

apps/web/src/data/seo.ts

@@ -10,7 +10,7 @@ const staticPages: Record<string, SeoMeta> = {
 	"/": {
 		title: "ooxml.dev — The OOXML spec, explained by people who actually implemented it",
 		description:
-			"Interactive ECMA-376 reference with live previews, implementation notes, and what the spec doesn't tell you. Built by SuperDoc — DOCX editing and tooling.",
+			"Interactive ECMA-376 reference with live previews and implementation notes. What the spec doesn't tell you, from the SuperDoc team.",
 		type: "website",
 	},
 	"/mcp": {

apps/web/src/index.css

@@ -3,9 +3,9 @@
 /* ooxml.dev theme - Blue */
 :root {
 	/* SuperDoc Blue accent */
-	--color-accent: #1355FF;
-	--color-accent-hover: #0F44CC;
-	--color-accent-light: #EFF4FF;
+	--color-accent: #1355ff;
+	--color-accent-hover: #0f44cc;
+	--color-accent-light: #eff4ff;
 
 	/* Backgrounds */
 	--color-bg-primary: #ffffff;
@@ -20,7 +20,7 @@
 	/* Text */
 	--color-text-primary: #1c1917;
 	--color-text-secondary: #57534e;
-	--color-text-muted: #a8a29e;
+	--color-text-muted: #78716c;
 
 	/* Syntax highlighting (for code blocks on dark bg) */
 	--color-syntax-tag: #22d3ee;