Mandats : origin→FK identité + nomination auto + boutons + tests intégration

- origin TEXT → origin_id UUID FK duniter_identities (migration e3f4a5b6c7d8)
- GET /auth/identities?q= : recherche d'identités par nom/adresse
- MandateCreate.nomination_mode : auto (auto-assign auteur), collective, postpone
- Wizard new.vue : champ origine = picker identité, checkbox "Démarrer maintenant"
- [id].vue : modal "Assigner" = search-picker (résout UUID vs adresse SS58), affiche
  origin_display_name + mandatee_display_name, inputs natifs (<input>/<textarea>)
- Erreurs API visibles dans l'UI (plus de catch silencieux)
- test_mandate_flows.py : 17 tests intégration SQLite réels (origin, nomination,
  assign, lifecycle, revocation, interactions croisées) — 241 tests total OK

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/app/pages/mandates/new.vue

@@ -152,9 +152,35 @@ const canGoToInfo = computed(() => {
 type MandateType = 'statutory' | 'functional'
 const mandateType = ref<MandateType>('functional')
 const title = ref('')
-const origin = ref('')
 const description = ref('')
 
+// Origin : identité Duniter (non texte libre)
+interface IdentityResult { id: string; address: string; display_name: string | null }
+const originQuery = ref('')
+const originResults = ref<IdentityResult[]>([])
+const originId = ref<string | null>(null)
+const originSearching = ref(false)
+let originTimer: ReturnType<typeof setTimeout> | null = null
+
+async function searchOrigin(q: string) {
+  if (q.length < 2) { originResults.value = []; return }
+  originSearching.value = true
+  try {
+    originResults.value = await $api<IdentityResult[]>('/auth/identities', { query: { q } })
+  } catch { originResults.value = [] } finally { originSearching.value = false }
+}
+function onOriginInput(q: string) {
+  originQuery.value = q
+  originId.value = null
+  if (originTimer) clearTimeout(originTimer)
+  originTimer = setTimeout(() => searchOrigin(q), 300)
+}
+function selectOrigin(r: IdentityResult) {
+  originId.value = r.id
+  originQuery.value = r.display_name || r.address
+  originResults.value = []
+}
+
 type DurationMode = 'relative' | 'dates'
 const durationMode = ref<DurationMode>('relative')
 const durationValue = ref(3)
@@ -265,24 +291,31 @@ const nominationSummary = computed(() => {
 })
 
 // ── Création ──────────────────────────────────────────────────────────────────
+const startImmediately = ref(true)
 const submitting = ref(false)
 const submitError = ref<string | null>(null)
 
+const auth = useAuthStore()
+
 async function createMandate() {
   submitting.value = true
   submitError.value = null
   try {
     const dates = computedDates()
+    const nominationMode = nominationCase.value === 'self' ? 'auto' : 'collective'
+
     const mandate = await mandates.create({
       title: title.value.trim(),
-      origin: origin.value.trim() || null,
+      origin_id: originId.value,
       description: description.value.trim() || null,
       mandate_type: mandateType.value,
+      nomination_mode: nominationMode,
       starts_at: dates.starts_at,
       ends_at: dates.ends_at,
     })
     if (!mandate) throw new Error('Erreur création mandat')
 
+    // Créer les étapes
     for (let i = 0; i < stepsToCreate.value.length; i++) {
       const s = stepsToCreate.value[i]!
       await $api(`/mandates/${mandate.id}/steps`, {
@@ -290,9 +323,15 @@ async function createMandate() {
         body: { step_order: i, step_type: s.step_type, title: s.title, description: s.description },
       })
     }
+
+    // Démarrer le processus si demandé
+    if (startImmediately.value) {
+      await $api(`/mandates/${mandate.id}/advance`, { method: 'POST' })
+    }
+
     navigateTo(`/mandates/${mandate.id}`)
   } catch (e: any) {
-    submitError.value = e?.message ?? 'Erreur lors de la création'
+    submitError.value = e?.data?.detail ?? e?.message ?? 'Erreur lors de la création'
   } finally {
     submitting.value = false
   }
@@ -620,17 +659,38 @@ function selectNomination(c: NominationCase) {
             />
           </div>
 
-          <!-- Origine -->
+          <!-- Origine (personne) -->
           <div class="mwiz__section">
-            <label class="mwiz__label">Origine <span class="mwiz__optional">(optionnel)</span></label>
-            <textarea
-              v-model="origin"
-              class="mwiz__textarea"
-              rows="2"
-              lang="fr"
-              spellcheck="true"
-              placeholder="Qui propose ce mandat, dans quel contexte, suite à quelle décision ou besoin ?"
-            />
+            <label class="mwiz__label">Proposé par <span class="mwiz__optional">(optionnel)</span></label>
+            <div class="relative">
+              <input
+                :value="originQuery"
+                type="text"
+                class="mwiz__input"
+                placeholder="Rechercher un membre de la communauté…"
+                @input="onOriginInput(($event.target as HTMLInputElement).value)"
+              />
+              <div
+                v-if="originResults.length"
+                class="absolute z-10 mt-1 w-full bg-white dark:bg-gray-900 rounded-xl border border-gray-200 dark:border-gray-700 shadow-lg overflow-hidden"
+              >
+                <button
+                  v-for="r in originResults"
+                  :key="r.id"
+                  class="w-full flex items-center gap-3 px-4 py-2 text-left text-sm hover:bg-gray-50 dark:hover:bg-gray-800"
+                  @click="selectOrigin(r)"
+                >
+                  <UIcon name="i-lucide-user" class="text-gray-400 shrink-0" />
+                  <div>
+                    <p class="font-medium text-gray-900 dark:text-white">{{ r.display_name || r.address }}</p>
+                    <p class="text-xs text-gray-500 font-mono">{{ r.address.slice(0, 20) }}…</p>
+                  </div>
+                </button>
+              </div>
+            </div>
+            <p v-if="originId" class="mwiz__hint text-green-600">
+              <UIcon name="i-lucide-check-circle" class="text-xs" /> {{ originQuery }} sélectionné
+            </p>
           </div>
 
           <!-- Description -->
@@ -709,7 +769,7 @@ function selectNomination(c: NominationCase) {
               <UIcon :name="MANDATE_TYPE_OPTIONS.find(o => o.value === mandateType)?.icon ?? 'i-lucide-circle'" class="text-xs" />
               {{ MANDATE_TYPE_OPTIONS.find(o => o.value === mandateType)?.label }}
             </p>
-            <p v-if="origin" class="mwiz__recap-meta">Origine : {{ origin }}</p>
+            <p v-if="originId" class="mwiz__recap-meta">Proposé par : {{ originQuery }}</p>
             <p v-if="description" class="mwiz__recap-meta">{{ description }}</p>
             <p class="mwiz__recap-meta">
               <UIcon name="i-lucide-clock" class="text-xs" />
@@ -732,6 +792,18 @@ function selectNomination(c: NominationCase) {
           </div>
         </div>
 
+        <!-- Option démarrage -->
+        <div class="mwiz__start-option">
+          <label class="mwiz__start-label">
+            <input v-model="startImmediately" type="checkbox" class="mwiz__checkbox" />
+            <span>Démarrer le processus de nomination immédiatement</span>
+          </label>
+          <p class="mwiz__start-hint">
+            <template v-if="startImmediately">Le mandat passera en phase de nomination dès la création.</template>
+            <template v-else>Le mandat restera en brouillon — à démarrer manuellement depuis la fiche.</template>
+          </p>
+        </div>
+
         <p v-if="submitError" class="mwiz__error">{{ submitError }}</p>
 
         <div class="mwiz__recap-actions">
@@ -1173,6 +1245,32 @@ function selectNomination(c: NominationCase) {
 
 .mwiz__error { color: var(--mood-danger, #e53e3e); font-size: 0.875rem; padding: 0.5rem 0; }
 
+/* Start option */
+.mwiz__start-option {
+  background: var(--mood-surface);
+  border-radius: 16px;
+  padding: 1.125rem 1.25rem;
+  margin-bottom: 1rem;
+}
+.mwiz__start-label {
+  display: flex;
+  align-items: center;
+  gap: 0.625rem;
+  font-weight: 600;
+  font-size: 0.9375rem;
+  color: var(--mood-text);
+  cursor: pointer;
+}
+.mwiz__checkbox {
+  width: 1.125rem;
+  height: 1.125rem;
+  accent-color: var(--mood-accent);
+  cursor: pointer;
+  flex-shrink: 0;
+}
+.mwiz__start-hint { font-size: 0.8125rem; color: var(--mood-muted); margin-top: 0.375rem; padding-left: 1.75rem; }
+.mwiz__hint { font-size: 0.8125rem; margin-top: 0.25rem; }
+
 /* Transitions */
 .slide-fade-enter-active, .slide-fade-leave-active { transition: all 0.2s ease; }
 .slide-fade-enter-from { opacity: 0; transform: translateX(20px); }