Fix duplicate export toast in chrome browse.js (v1.10.13)

exportConversation was emitting three toasts on a successful export
with artifacts:
  1. "Exporting X..." (line 656)
  2. "Exported: X with N artifact(s)" (line 741, branch-specific)
  3. "Exported: X" (line 794, unified post-save)

Same triple-emit on the "no artifacts found" sub-branch (lines 656,
762, 794). The "normal export without artifact extraction" branch
correctly only emitted two (initial + unified).

Removed the branch-specific toasts at 741 and 762 — the unified
post-save toast at line 794 already covers all three branches.
Firefox already had this pattern (commented "Toast handled below
after timestamp save"). Chrome had regressed.

Trade-off: lose the "with N artifact(s)" detail from the toast,
gain consistent single-emit UX across all export paths.

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

chrome/browse.js

@@ -738,7 +738,7 @@ async function exportConversation(conversationId, conversationName) {
         document.body.removeChild(a);
         URL.revokeObjectURL(url);
 
-        showToast(`Exported: ${conversationName} with ${artifactFiles.length} artifact(s)`);
+        // Toast handled below after timestamp save
       } else {
         // No artifacts found, export normally
         let content, filename, type;
@@ -759,7 +759,6 @@ async function exportConversation(conversationId, conversationName) {
             type = 'application/json';
         }
         downloadFile(content, filename, type);
-        showToast(`Exported: ${conversationName} (no artifacts found)`);
       }
     } else {
       // Normal export without artifact extraction

chrome/manifest.json

@@ -1,7 +1,7 @@
 {
     "manifest_version": 3,
     "name": "Claude Exporter Beta",
-    "version": "1.10.12",
+    "version": "1.10.13",
     "description": "Export conversations and artifacts from Claude.ai",
       "permissions": [
     "activeTab",

docs/CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## [1.10.13]
+
+- Fixed duplicate toast on single-conversation export. `exportConversation` was emitting three toasts on a successful export ("Exporting X...", then a branch-specific "Exported: X with N artifact(s)" or "Exported: X (no artifacts found)", then the unified "Exported: X" at the end). Removed the branch-specific toasts in Chrome — the unified post-save toast already covers all branches. Firefox already had this pattern; Chrome had regressed.
+
 ## [1.10.12]
 
 - Chrome/Firefox parity sync — multiple files had quietly drifted out of sync over recent edits. Brought Firefox into line with Chrome (the canonical copy per CLAUDE.md):

firefox/manifest.json

@@ -1,7 +1,7 @@
 {
   "manifest_version": 2,
   "name": "Claude Exporter Beta",
-  "version": "1.10.12",
+  "version": "1.10.13",
   "description": "Export conversations and artifacts from Claude.ai",
   "permissions": [
     "activeTab",