Add sow-* page styles for /news /blog /gallery (#21)

The file-based pages plugin ships templates using sow-* classes that had no CSS anywhere (live never had them either — the classes render unstyled today). Adds scss/westgate/_pages.scss following DESIGN.md: velvet panels, gilt-edge borders, Cinzel etched headings, dark-gold-plate primary buttons, responsive grids.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Reviewed-on: #21
Co-authored-by: vickydotbat <vickydotbat@tutamail.com>
Co-committed-by: vickydotbat <vickydotbat@tutamail.com>

theme.scss

@@ -10,4 +10,5 @@
 @import "./scss/westgate/search";
 @import "./scss/westgate/controls";
 @import "./scss/westgate/widgets";
+@import "./scss/westgate/pages";
 @import "./scss/westgate/responsive";