Replace copy button with a save button

public/app.js

@@ -14,7 +14,7 @@ const tabButtons = document.querySelectorAll(".tab");
 const brutalityBtns = document.querySelectorAll(".brutality-btn");
 const issueBadge = document.getElementById("issue-badge");
 const reviewMetrics = document.getElementById("review-metrics");
-const copyBtn = document.getElementById("copy-btn");
+const saveBtn = document.getElementById("save-btn");
 const toast = document.getElementById("toast");
 
 const GITHUB_BLOB_RE = /^https?:\/\/github\.com\/[^/]+\/[^/]+\/blob\/[^/]+\/.+$/;
@@ -375,7 +375,7 @@ function startReview() {
   });
   issueBadge.hidden = true;
   reviewMetrics.hidden = true;
-  copyBtn.hidden = true;
+  saveBtn.hidden = true;
   fullMarkdown = "";
 
   if (!url) { showInputError("Please enter a GitHub file URL."); return; }
@@ -425,7 +425,7 @@ function startReview() {
     const elapsed = performance.now() - reviewStartTime;
     const metrics = computeMetrics(markdown, fileTotalLines, elapsed);
     renderMetrics(metrics);
-    copyBtn.hidden = false;
+    saveBtn.hidden = false;
   });
 
   source.addEventListener("error", (e) => {

public/style.css

@@ -547,6 +547,26 @@ h1 {
   color: #fff;
 }
 
+/* ---------- Save Button ---------- */
+
+#save-btn {
+  padding: 6px 14px;
+  font-size: 0.82rem;
+  font-weight: 500;
+  color: #fff;
+  background: var(--accent);
+  border: 1px solid var(--border);
+  border-radius: var(--radius);
+  cursor: pointer;
+  transition: all 0.15s;
+}
+
+#save-btn:hover {
+  color: #fff;
+  background: var(--accent-hover);
+  border-color: var(--accent-hover);
+}
+
 /* ---------- Toast Notification ---------- */
 
 #toast {
@@ -569,4 +589,4 @@ h1 {
 #toast.show {
   transform: translateX(-50%) translateY(0);
   opacity: 1;
-}
+}