style: back arrow inline with article title, title bumped to 1.5rem

frontend/src/App.css

@@ -2052,18 +2052,30 @@ a.app-footer__repo:hover {
 }
 
 .technique-title-bar__title {
-  font-size: 1.25rem;
+  font-size: 1.5rem;
   font-weight: 700;
   color: var(--color-text-primary);
   margin: 0;
   line-height: 1.3;
   display: flex;
   align-items: center;
-  gap: 0.5rem;
+  gap: 0.625rem;
   flex: 1;
   min-width: 0;
 }
 
+.technique-title-bar__back {
+  color: var(--color-text-secondary);
+  text-decoration: none;
+  font-size: 1.125rem;
+  flex-shrink: 0;
+  transition: color 150ms ease;
+}
+
+.technique-title-bar__back:hover {
+  color: var(--color-accent);
+}
+
 .technique-title-bar__meta {
   display: flex;
   align-items: center;
@@ -2087,7 +2099,7 @@ a.app-footer__repo:hover {
 
 @media (max-width: 600px) {
   .technique-title-bar__title {
-    font-size: 1.0625rem;
+    font-size: 1.25rem;
   }
   .technique-title-bar__inner {
     flex-direction: column;

frontend/src/pages/TechniquePage.tsx

@@ -266,11 +266,6 @@ export default function TechniquePage() {
 
   return (
     <article className="technique-page">
-      {/* Back link */}
-      <Link to="/" className="back-link">
-        ← Back
-      </Link>
-
       {/* Historical version banner */}
       {isHistorical && (
         <div className="technique-banner technique-banner--version">
@@ -297,7 +292,10 @@ export default function TechniquePage() {
       {/* Sticky title bar — sits at top of article, becomes sticky on scroll */}
       <div className="technique-title-bar" ref={titleBarRef}>
         <div className="technique-title-bar__inner">
-          <h1 className="technique-title-bar__title">{displayTitle} <CopyLinkButton /></h1>
+          <h1 className="technique-title-bar__title">
+            <Link to="/" className="technique-title-bar__back" aria-label="Back to home">←</Link>
+            {displayTitle} <CopyLinkButton />
+          </h1>
           <div className="technique-title-bar__meta">
             {displayCategory && (
               <span className={"badge badge--category badge--cat-" + (displayCategory?.toLowerCase().replace(/\s+/g, "-") ?? "")}>