fix(offer-editor): fix category bug, add ripristina, always-saveable

- Bug: remove server-side category pre-filter from getOfferEditorData;
  services now loaded unfiltered, client-side filter handles display →
  changing category no longer wipes the service list
- Fix tierTotals to use full service map (not filtered subset) so totals
  stay correct when category is edited mid-session
- Add Ripristina button for archived offers (calls toggleOfferArchived false)
- Remove canSave gate: always allow saving; button is "Salva Bozza"
  (secondary style, stays on page) when no services assigned, "Salva
  Offerta" (primary, redirects to list) when at least one tier has services
- Show "Bozza salvata." inline feedback after draft save

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

src/lib/offer-queries.ts

@@ -206,23 +206,17 @@ export async function getOfferEditorData(macroId: string): Promise<OfferEditorDa
     servicesTotal: totalsMap.get(tier.id) ?? "0",
   }));
 
-  // Category-filtered service catalog for the composition matrix (D-4
-  // pre-filter, best-effort). If macro.category is unset, return all active
-  // services unfiltered.
-  const availableServicesQuery = db
+  // Full service catalog (unfiltered by category) — category filtering happens
+  // client-side so changing the category field doesn't wipe the service list.
+  const availableServices = await db
     .select({
       id: services.id,
       name: services.name,
       unit_price: services.unit_price,
       category: services.category,
     })
-    .from(services);
-
-  const availableServices = macro.category
-    ? await availableServicesQuery.where(
-        and(eq(services.active, true), eq(services.category, macro.category))
-      )
-    : await availableServicesQuery.where(eq(services.active, true));
+    .from(services)
+    .where(eq(services.active, true));
 
   // Tipo/Obiettivo tags for this macro.
   const tagRows = await db