style(campaigns/reminder): add "pour te remercier" / "as a thank-you"

Surfaces the WHY of the gift in the reminder body. The original
campaign was sent ~10 days before the reminder fires — recipients
may have forgotten the loyalty/gratitude context, leading to a
"what is this?" reaction when they see the reminder cold.

Adding two words ("pour te remercier" / "as a thank-you") cheaply
reconnects with the original messaging and reinforces TARGO's
relationship framing.

FR: "La carte-cadeau qu'on t'a envoyée pour te remercier peut
     s'utiliser chez des centaines de marques canadiennes..."

EN: "The gift card we sent you as a thank-you can be redeemed at
     hundreds of Canadian brands..."

Greeting kept as "Petit rappel pour {{firstname}}," — first-name
personalization beats generic "toi" on engagement metrics, and the
firstname auto-clean covers ~99% of recipients.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

scripts/campaigns/templates/gift-email-reminder-en.html

@@ -240,7 +240,7 @@ table, td { color: #1B2E24; } #u_body a { color: #00C853; text-decoration: under
                    align="left" style="font-size:0px;padding:10px 25px;padding-bottom:0;word-break:break-word;"
                 >
       <div
-         style="font-family:Plus Jakarta Sans, Helvetica, Arial, sans-serif;font-size:16px;line-height:1.5;text-align:justify;color:#374151;">We just wanted to make sure you didn't miss it. The gift card we sent you can be redeemed at hundreds of Canadian brands in just a few clicks.<br />
+         style="font-family:Plus Jakarta Sans, Helvetica, Arial, sans-serif;font-size:16px;line-height:1.5;text-align:justify;color:#374151;">We just wanted to make sure you didn't miss it. The gift card we sent you as a thank-you can be redeemed at hundreds of Canadian brands in just a few clicks.<br />
           If you'd rather not use it, no worries, no need to reply to this email.</div>
 
                 </td>

scripts/campaigns/templates/gift-email-reminder-fr.html

@@ -244,7 +244,7 @@ table, td { color: #1B2E24; } #u_body a { color: #00C853; text-decoration: under
                    align="left" style="font-size:0px;padding:10px 25px;padding-bottom:0;word-break:break-word;"
                 >
       <div
-         style="font-family:Plus Jakarta Sans, Helvetica, Arial, sans-serif;font-size:16px;line-height:1.5;text-align:justify;color:#374151;">On voulait juste s'assurer que tu ne l'as pas manqué. La carte-cadeau qu'on t'a envoyée peut s'utiliser chez des centaines de marques canadiennes, en quelques clics.<br />
+         style="font-family:Plus Jakarta Sans, Helvetica, Arial, sans-serif;font-size:16px;line-height:1.5;text-align:justify;color:#374151;">On voulait juste s'assurer que tu ne l'as pas manqué. La carte-cadeau qu'on t'a envoyée pour te remercier peut s'utiliser chez des centaines de marques canadiennes, en quelques clics.<br />
           Si tu préfères ne pas l'utiliser, aucun souci, pas besoin de répondre à ce courriel.</div>
 
                 </td>

services/targo-hub/templates/gift-email-reminder-en.html

@@ -240,7 +240,7 @@ table, td { color: #1B2E24; } #u_body a { color: #00C853; text-decoration: under
                    align="left" style="font-size:0px;padding:10px 25px;padding-bottom:0;word-break:break-word;"
                 >
       <div
-         style="font-family:Plus Jakarta Sans, Helvetica, Arial, sans-serif;font-size:16px;line-height:1.5;text-align:justify;color:#374151;">We just wanted to make sure you didn't miss it. The gift card we sent you can be redeemed at hundreds of Canadian brands in just a few clicks.<br />
+         style="font-family:Plus Jakarta Sans, Helvetica, Arial, sans-serif;font-size:16px;line-height:1.5;text-align:justify;color:#374151;">We just wanted to make sure you didn't miss it. The gift card we sent you as a thank-you can be redeemed at hundreds of Canadian brands in just a few clicks.<br />
           If you'd rather not use it, no worries, no need to reply to this email.</div>
 
                 </td>

services/targo-hub/templates/gift-email-reminder-fr.html

@@ -244,7 +244,7 @@ table, td { color: #1B2E24; } #u_body a { color: #00C853; text-decoration: under
                    align="left" style="font-size:0px;padding:10px 25px;padding-bottom:0;word-break:break-word;"
                 >
       <div
-         style="font-family:Plus Jakarta Sans, Helvetica, Arial, sans-serif;font-size:16px;line-height:1.5;text-align:justify;color:#374151;">On voulait juste s'assurer que tu ne l'as pas manqué. La carte-cadeau qu'on t'a envoyée peut s'utiliser chez des centaines de marques canadiennes, en quelques clics.<br />
+         style="font-family:Plus Jakarta Sans, Helvetica, Arial, sans-serif;font-size:16px;line-height:1.5;text-align:justify;color:#374151;">On voulait juste s'assurer que tu ne l'as pas manqué. La carte-cadeau qu'on t'a envoyée pour te remercier peut s'utiliser chez des centaines de marques canadiennes, en quelques clics.<br />
           Si tu préfères ne pas l'utiliser, aucun souci, pas besoin de répondre à ce courriel.</div>
 
                 </td>