slice 4: accent palette refinement — blue → teal

Replace the four accent-family hex codes site-wide with the teal palette
(keeps the dark theme; only swaps the accent family, not the dark base):

  #3b82f6 (accent primary CTA)   → #5B7C8D  (teal)        [839×]
  #2563eb (accent-dark / hover)  → #4A6473  (darker teal) [44×]
  #60a5fa (info link, lighter)   → #8FB0C3  (mid teal)    [68×]
  #1e3a5f (accent-muted bg)      → #2F4F5F  (navy)        [44×]

tailwind.config.js tokens updated to match (accent/accent-dark/accent-muted).
Sweep also covers tailwind.css. 108 files touched. The dark base (#0d0d0d,
#111, #161616, #1a1a1a etc.) is intentionally untouched.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/app/error.tsx

@@ -25,13 +25,13 @@ export default function Error({
         <div className="flex gap-3 justify-center">
           <button
             onClick={() => reset()}
-            className="px-4 py-2 bg-[#3b82f6] text-white text-sm rounded-sm hover:bg-[#2563eb] transition-colors"
+            className="px-4 py-2 bg-[#5B7C8D] text-white text-sm rounded-sm hover:bg-[#4A6473] transition-colors"
           >
             Try again
           </button>
           <Link
             href="/home-page"
-            className="px-4 py-2 border border-[#333] text-sm rounded-sm hover:border-[#3b82f6] transition-colors"
+            className="px-4 py-2 border border-[#333] text-sm rounded-sm hover:border-[#5B7C8D] transition-colors"
           >
             Home
           </Link>