Platform 0.1.6 (contact security) + fidelity fixes from the port review

- .container back in @layer components so Tailwind's px-4 still wins; unlayered it had
  quietly widened the gutter on every page
- shadow-sm -> shadow-xs: Tailwind v4 renamed the scale, so the ported markup was giving
  every white card a heavier shadow than the live site
- route changes jump to the top again instead of smooth-scrolling
- preload the wordmark font and the hero image

Co-Authored-By: Claude Opus 4.8 <[email protected]>
Claude-Session: https://claude.ai/code/session_01XXKjx7FNyRVAjU8dgB5KhN

pom.xml

@@ -7,7 +7,7 @@
     <parent>
         <groupId>net.thebennett.platform</groupId>
         <artifactId>platform-parent</artifactId>
-        <version>0.1.5</version>
+        <version>0.1.6</version>
         <relativePath/>
     </parent>
 
@@ -22,7 +22,7 @@
             <dependency>
                 <groupId>net.thebennett.platform</groupId>
                 <artifactId>platform-bom</artifactId>
-                <version>0.1.5</version>
+                <version>0.1.6</version>
                 <type>pom</type>
                 <scope>import</scope>
             </dependency>