Fix email signature layout and enhance email thread fetching

- Move logo to top of email signature for better formatting
- Enhance IMAP search to include CC/BCC fields and multiple folders
- Fix EOI document generation to properly send and extract signing URLs
- Update documentation with all email system fixes

components/EmailComposer.vue

@@ -253,14 +253,14 @@ const getSignaturePreview = () => {
   
   return `
 <div style="margin-top: 20px;">
+  <img src="/Port_Nimara_Logo_2_Colour_New_Transparent.png" alt="Port Nimara" style="height: 60px; max-width: 200px; margin-bottom: 15px;">
+  <br>
   <div style="font-weight: bold;">${sig.name || 'Your Name'}</div>
   <div style="color: #666; margin-bottom: 8px;">${sig.title || 'Your Title'}</div>
   <div style="font-weight: bold; margin-bottom: 12px;">${sig.company || 'Company Name'}</div>
   ${contactLines ? contactLines + '<br>' : ''}
   <a href="mailto:${userEmail}" style="color: #0066cc;">${userEmail}</a>
   <br><br>
-  <img src="/Port_Nimara_Logo_2_Colour_New_Transparent.png" alt="Port Nimara" style="height: 60px; max-width: 200px;">
-  <br>
   <div style="color: #666; font-size: 12px; margin-top: 10px;">
     The information in this message is confidential and may be privileged.<br>
     It is intended for the addressee alone.<br>