feat(b2b-marketing): Finalize grounding architecture and frontend improvements

- Upgrade backend to use gemini-2.5-flash with sanitized HTML parsing (no token limit).
- Implement robust retry logic and increased timeouts (600s) for deep analysis.
- Add file-based logging for prompts and responses.
- Fix API endpoint (v1) and regex parsing issues.
- Frontend: Optimize PDF export (landscape, no scrollbars), fix copy-paste button, add 'Repeat Step 6' feature.
- Update documentation to 'Completed' status.

b2b-marketing-assistant/components/StepDisplay.tsx

@@ -51,19 +51,55 @@ export const StepDisplay: React.FC<StepDisplayProps> = ({ title, summary, header
         onDataChange(newRows);
     };
     
+    const fallbackCopyTextToClipboard = (text: string) => {
+        const textArea = document.createElement("textarea");
+        textArea.value = text;
+        
+        // Ensure textarea is not visible but part of DOM
+        textArea.style.position = "fixed";
+        textArea.style.left = "-9999px";
+        textArea.style.top = "0";
+        
+        document.body.appendChild(textArea);
+        textArea.focus();
+        textArea.select();
+        
+        try {
+            document.execCommand('copy');
+            setCopySuccess(t.copySuccess);
+            setTimeout(() => setCopySuccess(''), 2000);
+        } catch (err) {
+            console.error('Fallback: Oops, unable to copy', err);
+            setCopySuccess(t.copyFailure);
+            setTimeout(() => setCopySuccess(''), 2000);
+        }
+        
+        document.body.removeChild(textArea);
+    };
+
     const handleCopyToClipboard = (text: string) => {
-        navigator.clipboard.writeText(text).catch(err => console.error('Failed to copy text: ', err));
+        if (!navigator.clipboard) {
+            fallbackCopyTextToClipboard(text);
+            return;
+        }
+        navigator.clipboard.writeText(text).catch(err => {
+            console.error('Failed to copy text: ', err);
+            fallbackCopyTextToClipboard(text);
+        });
     };
 
     const handleCopyTable = () => {
         const tsvString = convertArrayToTsv(headers, filteredRows);
+        if (!navigator.clipboard) {
+            fallbackCopyTextToClipboard(tsvString);
+            return;
+        }
         navigator.clipboard.writeText(tsvString).then(() => {
             setCopySuccess(t.copySuccess);
             setTimeout(() => setCopySuccess(''), 2000);
         }).catch(err => {
             console.error('Failed to copy table: ', err);
-            setCopySuccess(t.copyFailure);
-            setTimeout(() => setCopySuccess(''), 2000);
+            fallbackCopyTextToClipboard(tsvString);
         });
     };
 
@@ -173,7 +209,7 @@ export const StepDisplay: React.FC<StepDisplayProps> = ({ title, summary, header
                 </div>
             </div>
             
-            <div className="overflow-x-auto">
+            <div className="overflow-x-auto print:overflow-visible print:block">
                 <table className="w-full table-fixed text-sm text-left text-slate-500 dark:text-slate-400">
                     <thead className="text-xs text-slate-700 dark:text-slate-300 uppercase bg-slate-100 dark:bg-slate-700">
                         <tr>