fix(templates): cross-validate against official Gitea mail templates

- Fix INK theme: replace .ActiveCodeLives with correct field, remove from non-auth contexts (8 files)
- Fix hardcoded button text: use locale key mail.view_it_on in ember, heritage, ink, mono, terminal, terra (30+ files)
- Add missing {{if .CanReply}}mail.reply{{end}} block to all 10 themes default.tmpl
- Add missing mail.release.note locale label to all 10 themes release.tmpl
- Add missing mail.team_invite.text_3 to ink and terra team_invite.tmpl
- Add missing blockquote CSS to aurora, ink, mono, neon, terra default.tmpl

Verified: all 110 templates compile successfully with Go build-preview.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

themes/ink/mail/repo/issue/default.tmpl

@@ -7,6 +7,7 @@
   <title>{{.Subject}}</title>
   <style type="text/css">
     body,.ExternalClass,.ReadMsgBody{background-color:#ede4d4}
+    blockquote { padding-left: 1em; margin: 1em 0; border-left: 1px solid #c4a97d; color: #777 }
     @media only screen and (max-width:480px){
       .resp-pad{padding-left:16px!important;padding-right:16px!important}
       .resp-col{width:100%!important;display:block!important;border-left:none!important;padding-left:28px!important;padding-right:28px!important;padding-top:0!important}
@@ -34,7 +35,7 @@
           <p style="margin:0 0 20px;font-size:12px;line-height:1.8;color:#666;font-style:italic;"></p>
           
           <table border="0" cellpadding="0" cellspacing="0" style="margin:0 0 24px;"><tr><td style="padding:10px 24px;background:#1a1a2e;border:1px solid #c4a97d;">
-            <a href="{{.Link}}" class="resp-btn" style="display:inline-block;font-size:13px;font-weight:700;color:#fefdfb;text-decoration:none;font-variant:small-caps;letter-spacing:1px;">Activate Account &raquo;</a>
+            <a href="{{.Link}}" class="resp-btn" style="display:inline-block;font-size:13px;font-weight:700;color:#fefdfb;text-decoration:none;font-variant:small-caps;letter-spacing:1px;">{{.locale.Tr "mail.view_it_on" AppName}} &raquo;</a>
           </td></tr></table>
           <table width="100%" cellpadding="0" cellspacing="0" border="0" style="border:1px solid #c4a97d;background:#fefdfb;"><tr><td style="padding:12px 14px;">
             <p style="margin:0 0 4px;font-size:10px;color:#888;font-style:italic;">{{.locale.Tr "mail.link_not_working_do_paste"}}</p>
@@ -46,13 +47,12 @@
           <p style="margin:0 0 10px;font-size:10px;color:#888;text-transform:uppercase;letter-spacing:1px;font-family:system-ui,sans-serif;font-weight:700;">Quick Info</p>
           <table width="100%" cellpadding="0" cellspacing="0" border="0" style="border-top:1px solid #ddd;border-bottom:1px solid #ddd;">
             <tr><td style="padding:8px 0;font-size:11px;color:#555;font-family:system-ui,sans-serif;">From<br /><strong style="color:#1a1a2e;">{{AppName}}</strong></td></tr>
-            <tr><td style="padding:8px 0;border-top:1px solid #ddd;font-size:11px;color:#555;font-family:system-ui,sans-serif;">Expires<br /><strong style="color:#1a1a2e;">{{.ActiveCodeLives}}</strong></td></tr>
           </table>
         </td>
       </tr>
       <!-- footer -->
       <tr><td colspan="2" style="padding:16px 28px;border-top:1px solid #ccc;text-align:center;">
-        <p style="margin:0;font-size:11px;color:#888;font-style:italic;">&copy; <a href="{{AppUrl}}" style="color:#1a1a2e;text-decoration:none;font-weight:600;border-bottom:1px dotted #c4a97d;">{{AppName}}</a> &mdash; Gitea Mail Templates</p>
+        <p style="margin:0;font-size:11px;color:#888;font-style:italic;">&copy; <a href="{{AppUrl}}" style="color:#1a1a2e;text-decoration:none;font-weight:600;border-bottom:1px dotted #c4a97d;">{{AppName}}</a> &mdash; <a href="{{.Link}}" style="color:#1a1a2e;text-decoration:none;">{{.locale.Tr "mail.view_it_on" AppName}}</a>{{if .CanReply}}&nbsp;{{.locale.Tr "mail.reply"}}{{end}}.</p>
       </td></tr>
     </table>
   </center>