feat: offer_type (una tantum/retainer), dedup tiers, redesigned Offerte tab

- offer_macros.offer_type ('una_tantum'|'retainer') + editor "Modalità" toggle
  (migration 0012, applied to prod)
- migration 0012 also adds UNIQUE(macro_id, tier_letter) — prevents duplicate
  tiers; ran after a one-time dedup of Web Domination's duplicate A/B/C tiers
- OffersTab redesigned: two-step assign (Offer → Tier cards with price), type
  badge "Una tantum/Ricorrente" instead of misleading "X mesi", no redundant
  "· A" when public_name == tier letter, cleaner active-offers cards
- getProjectFullDetail: availableMicros grouped by macro + defensive dedup;
  projectOffers/availableMicros carry offer_type/category/price
- proposal deck PricingSection shows offer type (fallback to duration for
  pre-existing proposals)

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

src/lib/admin-queries.ts

@@ -212,6 +212,7 @@ export type ProjectOfferWithMicro = {
   micro_duration_months: number;
   tier_letter: string | null;
   macro_internal_name: string;
+  macro_offer_type: string;
   start_date: Date;
   accepted_total: string | null;
   created_at: Date;
@@ -556,7 +557,11 @@ export type ProjectFullDetail = {
     public_name: string;
     duration_months: number;
     tier_letter: string | null;
+    public_price: string | null;
+    macro_id: string;
     macro_internal_name: string;
+    macro_category: string | null;
+    macro_offer_type: string;
   }>;
 };
 
@@ -644,6 +649,7 @@ export async function getProjectFullDetail(id: string): Promise<ProjectFullDetai
           micro_duration_months: offer_micros.duration_months,
           tier_letter: offer_micros.tier_letter,
           macro_internal_name: offer_macros.internal_name,
+          macro_offer_type: offer_macros.offer_type,
           start_date: project_offers.start_date,
           accepted_total: project_offers.accepted_total,
           created_at: project_offers.created_at,
@@ -653,7 +659,9 @@ export async function getProjectFullDetail(id: string): Promise<ProjectFullDetai
         .innerJoin(offer_macros, eq(offer_micros.macro_id, offer_macros.id))
         .where(eq(project_offers.project_id, id))
         .orderBy(asc(project_offers.created_at)),
-      // Query B: all tiers of non-archived offers (for the assignment dropdown)
+      // Query B: all tiers of non-archived offers (for the assignment dropdown).
+      // ordered oldest-first per (macro, tier) so client-side dedup keeps the
+      // oldest until the DB cleanup removes genuine duplicates.
       db
         .select({
           id: offer_micros.id,
@@ -661,12 +669,20 @@ export async function getProjectFullDetail(id: string): Promise<ProjectFullDetai
           public_name: offer_micros.public_name,
           duration_months: offer_micros.duration_months,
           tier_letter: offer_micros.tier_letter,
+          public_price: offer_micros.public_price,
+          macro_id: offer_micros.macro_id,
           macro_internal_name: offer_macros.internal_name,
+          macro_category: offer_macros.category,
+          macro_offer_type: offer_macros.offer_type,
         })
         .from(offer_micros)
         .innerJoin(offer_macros, eq(offer_micros.macro_id, offer_macros.id))
         .where(eq(offer_macros.is_archived, false))
-        .orderBy(asc(offer_macros.internal_name), asc(offer_micros.tier_letter)),
+        .orderBy(
+          asc(offer_macros.internal_name),
+          asc(offer_micros.tier_letter),
+          asc(offer_micros.id)
+        ),
     ]);
 
   const allEntityIds = [id, ...taskIds, ...deliverablesRows.map((d) => d.id)];
@@ -689,6 +705,16 @@ export async function getProjectFullDetail(id: string): Promise<ProjectFullDetai
       })),
   }));
 
+  // Defensive dedup: until the DB cleanup removes genuine duplicate tiers,
+  // keep one micro per (macro_id, tier_letter) for the assignment dropdown.
+  const seenTier = new Set<string>();
+  const dedupedMicros = availableMicrosRows.filter((m) => {
+    const key = `${m.macro_id}::${m.tier_letter ?? `_null_${m.id}`}`;
+    if (seenTier.has(key)) return false;
+    seenTier.add(key);
+    return true;
+  });
+
   return {
     project: { ...project, client } as ProjectFullDetail["project"],
     phases: phasesWithTasks,
@@ -702,7 +728,7 @@ export async function getProjectFullDetail(id: string): Promise<ProjectFullDetai
     activeTimerStartedAt: activeEntryRows[0]?.started_at ?? null,
     totalTrackedSeconds: totalRes[0] ? parseInt(totalRes[0].total) : 0,
     projectOffers: projectOffersRows as ProjectOfferWithMicro[],
-    availableMicros: availableMicrosRows,
+    availableMicros: dedupedMicros,
   };
 }