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/terra/mail/repo/actions/workflow_run.tmpl

@@ -32,9 +32,9 @@
       <tr><td class="resp-pad" style="padding:16px 32px 24px;color:#5c4030;">
         <p style="margin:0 0 8px;font-size:15px;line-height:1.8;color:#6b5040;"><h2>{{.Repo.FullName}} - {{.Run.WorkflowID}}: {{.RunStatusText}}</h2><ul>{{range $job := .Jobs}}<li><a href="{{$job.HTMLURL}}">{{$job.Status}}: {{$job.Name}}{{if gt $job.Attempt 1}} (retry #{{$job.Attempt}}){{end}} - {{$job.Duration}}</a></li>{{end}}</ul></p>
         <p style="margin:0 0 24px;font-size:14px;line-height:1.8;color:#8c7a6e;font-style:italic;"></p>
-        
+
         <table border="0" cellpadding="0" cellspacing="0" width="100%" style="margin:0 0 28px;"><tr><td>
-          <a href="{{.Run.HTMLURL}}" class="resp-btn" style="display:inline-block;padding:14px 38px;font-size:15px;font-weight:600;color:#fff;text-decoration:none;background:#c67b5c;border-radius:24px;letter-spacing:0.3px;">Activate Your Account</a>
+          <a href="{{.Run.HTMLURL}}" class="resp-btn" style="display:inline-block;padding:14px 38px;font-size:15px;font-weight:600;color:#fff;text-decoration:none;background:#c67b5c;border-radius:24px;letter-spacing:0.3px;">{{.locale.Tr "mail.view_it_on" AppName}}</a>
         </td></tr></table>
         <table width="100%" cellpadding="0" cellspacing="0" border="0" style="border:1px solid #d4c4a8;background:#f5ede0;border-radius:8px;"><tr><td style="padding:14px 16px;border-radius:8px;">
           <p style="margin:0 0 6px;font-size:12px;color:#8c7a6e;font-style:italic;">{{.locale.Tr "mail.link_not_working_do_paste"}}</p>