v0.2.0:39 — Buy page: render tier card for single-public-policy products

Previously the tier picker gated on `policies.len() < 2` and returned
an empty string when a product had only one public policy. Buyers
saw just the price card + form — none of the entitlements, marketing
bullets, or description the operator had carefully authored on that
tier. Reported against the Recap product, which has 3 policies but
only Pro public; Pro's bullets were invisible to buyers.

Fixed:

- render_tier_picker gate flipped from `< 2` to `is_empty()`. A
  single public policy now renders a single tier card.
- New `.tiers-1` grid class: one centered column at ~480px max-width.
  Keeps the single card from stretching to the full 1040px container.
- `n` computation extends to handle 1 in the existing match arm.

The price card below the picker still renders unchanged for the
single-policy case — acts as the buy-confirmation summary. Operators
keeping most tiers private and only exposing one to buyers now get
the same rich tier-card render that multi-tier products always had.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

licensing-service/src/api/buy_page.rs

@@ -305,6 +305,10 @@ h1 {{
     1fr   /* row 7: features (fills) */
     auto; /* row 8: button */
 }}
+/* Single-policy products: one centered card at a comfortable width.
+   Wide enough to read entitlements + marketing bullets clearly without
+   stretching across the full container. */
+.tiers-1 {{ grid-template-columns:minmax(0, 480px); justify-content:center; }}
 .tiers-2 {{ grid-template-columns:repeat(2, 1fr); }}
 .tiers-3 {{ grid-template-columns:repeat(3, 1fr); }}
 .tiers-4 {{ grid-template-columns:repeat(2, 1fr); }}
@@ -1093,19 +1097,23 @@ footer.kfooter a:hover {{ color:var(--navy-900); }}
 }
 
 /// Build the server-rendered tier-picker HTML. Returns an empty string
-/// when the product has fewer than 2 public policies (i.e., the existing
-/// single-price view is sufficient).
+/// only when the product has zero public policies (the bare price-card +
+/// form fallback covers that case). For one public policy, we still
+/// render a single tier card so the operator-configured entitlements
+/// and marketing bullets surface — without this, single-tier products
+/// showed only price + form, eating the operator's tier copy.
 fn render_tier_picker(
     policies: &[crate::models::Policy],
     initial: &Option<crate::models::Policy>,
     product: &crate::models::Product,
     featured_by_policy: &std::collections::HashMap<String, crate::models::DiscountCode>,
 ) -> String {
-    if policies.len() < 2 {
+    if policies.is_empty() {
         return String::new();
     }
     let n = policies.len().min(4);
     let class_n = match n {
+        1 => "tiers-1",
         2 => "tiers-2",
         3 => "tiers-3",
         _ => "tiers-4",