Add price-only MapPin variant (no name)

Name is now optional. When omitted, renders a compact single-line
pill with just "From $X" using the bolder name styling. Useful for
denser map views or when provider identity isn't needed at pin level.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/components/atoms/MapPin/MapPin.stories.tsx

@@ -74,6 +74,30 @@ export const NameOnlyUnverified: Story = {
   },
 };
 
+/** Price-only pill — no name, verified */
+export const PriceOnly: Story = {
+  args: {
+    price: 900,
+    verified: true,
+  },
+};
+
+/** Price-only pill — unverified */
+export const PriceOnlyUnverified: Story = {
+  args: {
+    price: 1200,
+  },
+};
+
+/** Price-only pill — active */
+export const PriceOnlyActive: Story = {
+  args: {
+    price: 900,
+    verified: true,
+    active: true,
+  },
+};
+
 /** Custom price label */
 export const CustomPriceLabel: Story = {
   args: {