fix(ops/campaigns): clarify Step 2 actions + add inline preview + jump-to-editor

User confusion: the "Approuver — 3 à envoyer" button at the end of Step 2
had a send icon, suggesting it fired emails immediately. It actually
just navigated to Step 3 (the confirmation step). The current flow has
two consent moments (Step 2 approve → Step 3 launch) but the UI made
them look like one.

Three changes to address this:

1. Step 2 navigation button:
   - Icon changed from 'send' to 'arrow_forward' — clearly "next step"
   - Label changed from "Approuver — N à envoyer" to "Continuer — N prêts"
   - Added tooltip explaining the send only happens at Step 3

2. Inline preview dialog:
   - New "Aperçu du courriel" button in Step 2 (and Step 3)
   - Opens a maximized dialog with an iframe rendering the actual template
     via POST /campaigns/templates/:name/preview, using the first sendable
     recipient's real data + the campaign params (amount, expiry, etc.)
   - FR/EN toggle inside the dialog so the user can verify both templates
     before launching a mixed-language campaign
   - Defaults to the recipient's own language for first view
   - Non-destructive — fires zero emails

3. Always-accessible "Éditer le template" link:
   - Persistent button in the page header (visible all 3 steps)
   - Plus secondary buttons in Step 2 + Step 3 action rows
   - Opens the template editor in a NEW TAB so the wizard's state
     (uploaded CSVs, parsed recipients) stays intact in the original
     tab — the user can tweak the template, save, switch back, click
     "Aperçu" to see the change, then continue with the send

4. Step 3 confirmation hardening:
   - Banner color escalated from amber to red (this IS the point of no
     return for actual delivery)
   - Wrap the launch button click in a Quasar confirm dialog ("Envoyer
     N courriel(s) maintenant ? Pas annulable.") — adds a third friction
     point against accidental clicks
   - Launch button is red (negative) — visually distinct from the green
     navigation primaries to signal "destructive action ahead"
   - Back-to-Step 2 button renamed "Retour modifier" with arrow_back
     icon for clarity

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

apps/ops/src/modules/campaigns/pages/CampaignNewPage.vue

@@ -3,6 +3,14 @@
     <div class="row items-center q-mb-md">
       <q-btn flat dense round icon="arrow_back" :to="'/campaigns'" class="q-mr-sm" />
       <div class="text-h5">Nouvelle campagne</div>
+      <q-space />
+      <!-- Always-accessible jump-to-editor link. Opens in new tab so the
+           wizard's uploaded files + parsed recipients stay intact. Useful
+           when the user wants to tweak the template mid-import. -->
+      <q-btn flat color="primary" icon="palette" label="Éditer le template (nouvel onglet)"
+             type="a" href="/ops/#/campaigns/templates/gift-email-fr" target="_blank">
+        <q-tooltip>S'ouvre dans un nouvel onglet — tes fichiers uploadés restent intacts ici</q-tooltip>
+      </q-btn>
     </div>
 
     <q-stepper v-model="step" header-nav ref="stepper" color="primary" animated flat bordered class="bg-white">
@@ -212,10 +220,27 @@
           </q-list>
         </q-expansion-item>
 
+        <!-- Action row: preview + edit template are quick-access utilities,
+             both non-destructive. The primary action is "Continuer" which
+             moves to Step 3 (still NOT the send — Step 3 has its own
+             explicit launch button). Icon changed from 'send' (confusing,
+             looked like it fired) to 'arrow_forward'. -->
         <q-stepper-navigation>
           <q-btn flat label="Retour" @click="step = 1" />
-          <q-btn unelevated color="primary" :label="`Approuver — ${sendableCount} à envoyer`" icon-right="send"
-                 class="q-ml-sm" @click="step = 3" :disable="sendableCount === 0" />
+          <q-space />
+          <q-btn flat color="primary" icon="visibility" label="Aperçu du courriel"
+                 :disable="!firstPreviewable" @click="openPreview" class="q-mr-sm">
+            <q-tooltip>Voir le rendu du courriel avec les vraies données du destinataire #1 (n'envoie rien)</q-tooltip>
+          </q-btn>
+          <q-btn flat color="primary" icon="palette" label="Éditer le template"
+                 type="a" :href="editorHref" target="_blank" class="q-mr-sm">
+            <q-tooltip>Ouvre l'éditeur dans un nouvel onglet — ton import reste ici intact</q-tooltip>
+          </q-btn>
+          <q-btn unelevated color="primary" :label="`Continuer — ${sendableCount} prêts`"
+                 icon-right="arrow_forward"
+                 @click="step = 3" :disable="sendableCount === 0">
+            <q-tooltip>Va à l'étape de confirmation finale. L'envoi ne démarre qu'au clic sur "Lancer l'envoi" de l'étape 3.</q-tooltip>
+          </q-btn>
         </q-stepper-navigation>
       </q-step>
 
@@ -236,19 +261,52 @@
               <q-item><q-item-section side>Durée estimée</q-item-section><q-item-section>≈ {{ estimatedMinutes }} min</q-item-section></q-item>
             </q-list>
           </q-card-section>
-          <q-card-section class="bg-orange-1 text-orange-9">
-            <q-icon name="info" /> L'envoi démarre dès que vous cliquez ci-dessous.
-            Vous serez redirigé vers la page de progression en temps réel.
+          <q-card-section class="bg-red-1 text-red-9">
+            <q-icon name="warning" /> <strong>Confirmation finale.</strong>
+            L'envoi démarre dès le clic sur <em>"Lancer l'envoi maintenant"</em>.
+            Tu seras redirigé vers la page de progression temps réel.
           </q-card-section>
         </q-card>
         <q-stepper-navigation>
-          <q-btn flat label="Retour" @click="step = 2" />
-          <q-btn unelevated color="primary" label="Lancer l'envoi" icon-right="send"
-                 class="q-ml-sm" :loading="sending" @click="launchSend" />
+          <q-btn flat label="Retour modifier" icon="arrow_back" @click="step = 2" />
+          <q-space />
+          <q-btn flat color="primary" icon="visibility" label="Aperçu courriel" :disable="!firstPreviewable" @click="openPreview" class="q-mr-sm" />
+          <q-btn unelevated color="negative" label="Lancer l'envoi maintenant" icon-right="send"
+                 :loading="sending" @click="confirmAndLaunch" />
         </q-stepper-navigation>
       </q-step>
 
     </q-stepper>
+
+    <!-- Preview dialog — renders the actual template with the first sendable
+         recipient's data + the campaign params. Lets the user verify the
+         visual + content WITHOUT firing any emails. Toggleable FR/EN since
+         a mixed-language campaign would send both templates. -->
+    <q-dialog v-model="previewOpen" maximized persistent>
+      <q-card class="bg-grey-2">
+        <q-toolbar class="bg-white" style="border-bottom:1px solid #e5e7eb">
+          <q-icon name="visibility" class="q-mr-sm" />
+          <q-toolbar-title>
+            Aperçu du courriel
+            <span v-if="previewRecipient" class="text-caption text-grey-7">
+              · destinataire #{{ previewRecipient.row_index }} {{ previewRecipient.firstname }} {{ previewRecipient.lastname }}
+            </span>
+          </q-toolbar-title>
+          <q-btn-toggle v-model="previewLang" :options="[{label:'🇫🇷 FR', value:'fr'},{label:'🇺🇸 EN', value:'en'}]"
+                        dense unelevated toggle-color="primary" @update:model-value="renderPreview" />
+          <q-btn flat icon="open_in_new" :href="editorHref" target="_blank" class="q-mx-sm">
+            <q-tooltip>Éditer dans un nouvel onglet</q-tooltip>
+          </q-btn>
+          <q-btn flat dense round icon="close" @click="previewOpen = false" />
+        </q-toolbar>
+        <q-banner v-if="previewLoading" class="bg-blue-1 text-blue-9">
+          <q-spinner size="sm" /> Rendu en cours…
+        </q-banner>
+        <q-card-section class="q-pa-md" style="height: calc(100vh - 60px); overflow:hidden">
+          <iframe :srcdoc="previewHtmlContent" style="width:100%; height:100%; border:1px solid #e5e7eb; background:#fff;"></iframe>
+        </q-card-section>
+      </q-card>
+    </q-dialog>
   </q-page>
 </template>
 
@@ -256,7 +314,7 @@
 import { ref, computed } from 'vue'
 import { useRouter } from 'vue-router'
 import { useQuasar } from 'quasar'
-import { parseCsvs, createCampaign, sendCampaign } from 'src/api/campaigns'
+import { parseCsvs, createCampaign, sendCampaign, previewTemplate } from 'src/api/campaigns'
 
 const $q = useQuasar()
 const router = useRouter()
@@ -344,6 +402,81 @@ function shortenUrl (u) {
   return u.replace(/^https?:\/\//, '').slice(0, 28) + (u.length > 35 ? '…' : '')
 }
 
+// ── Preview dialog ──────────────────────────────────────────────────────────
+// Renders the email through the hub's /campaigns/templates/:name/preview
+// endpoint, using the first sendable recipient's data + the current campaign
+// params. Non-destructive — no emails are fired by this action.
+const previewOpen = ref(false)
+const previewLoading = ref(false)
+const previewHtmlContent = ref('')
+const previewLang = ref('fr')
+const previewRecipient = ref(null)
+
+// First recipient that's actually going to be sent — used as the preview
+// sample so the user sees real data, not synthetic placeholders.
+const firstPreviewable = computed(() =>
+  recipients.value.find(r => !r.excluded && r.gift_url) || null
+)
+
+// Link to the template editor for the relevant language. Always opens
+// in a new tab so the user's in-progress wizard state is preserved.
+const editorHref = computed(() =>
+  `/ops/#/campaigns/templates/gift-email-${previewLang.value}`
+)
+
+async function openPreview () {
+  const r = firstPreviewable.value
+  if (!r) return
+  previewRecipient.value = r
+  // Default preview language to the recipient's actual language so the user
+  // first sees what THIS recipient will receive
+  previewLang.value = (r.language || 'fr').toLowerCase().split('-')[0]
+  previewOpen.value = true
+  await renderPreview()
+}
+
+async function renderPreview () {
+  if (!previewRecipient.value) return
+  previewLoading.value = true
+  try {
+    const r = previewRecipient.value
+    const vars = {
+      firstname:         r.firstname || (previewLang.value === 'en' ? 'dear customer' : 'cher client'),
+      lastname:          r.lastname  || '',
+      email:             r.email,
+      description:       r.civic_address || '',
+      gift_url:          r.gift_url,
+      amount:            params.value.amount,
+      expiry:            params.value.expiry,
+      commitment_months: params.value.commitment_months,
+      year:              new Date().getFullYear(),
+    }
+    const res = await previewTemplate(`gift-email-${previewLang.value}`, { vars })
+    previewHtmlContent.value = res.rendered || ''
+  } catch (e) {
+    $q.notify({ type: 'negative', message: 'Aperçu impossible: ' + e.message })
+  } finally {
+    previewLoading.value = false
+  }
+}
+
+// Wrapper around launchSend that confirms one last time before firing. The
+// Step 3 page is already a "confirmation step", but this dialog adds one
+// final friction so accidental clicks don't fire 200 emails.
+function confirmAndLaunch () {
+  $q.dialog({
+    title: 'Envoyer maintenant ?',
+    message: `Cette action enverra <strong>${sendableCount.value} courriel(s)</strong>
+              via Mailjet immédiatement. Pas annulable une fois démarré.`,
+    html: true,
+    persistent: true,
+    ok: { label: 'Oui, envoyer', color: 'negative', icon: 'send', unelevated: true },
+    cancel: { label: 'Annuler', flat: true },
+  }).onOk(() => {
+    launchSend()
+  })
+}
+
 function readFile (file) {
   return new Promise((resolve, reject) => {
     const r = new FileReader()