fix(frontend): center capped content column on wide viewports (#50)

The .page column was max-width 72rem but left-aligned, leaving a large
empty band on the right above ~1200px. margin-inline: auto centers it;
narrow widths are unchanged since the column fills the viewport anyway.

Co-authored-by: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

CHANGELOG.md

@@ -4,6 +4,10 @@ All notable changes to Primora. Format follows [Keep a Changelog](https://keepac
 
 ## [Unreleased]
 
+### Fixed
+
+- **Content column centers on wide screens** — `.page` was capped at 72rem but left-aligned, so above ~1200px the dashboard hugged the left with a growing dead zone on the right. It now centers (`margin-inline: auto`) while staying full-width below the cap.
+
 ## [0.8.4] - 2026-09-28
 
 ### Added

apps/frontend/src/index.css

@@ -1096,6 +1096,8 @@ code {
   /* ---------- page scaffold ---------- */
   .page {
     max-width: 72rem;
+    width: 100%;
+    margin-inline: auto;
     display: flex;
     flex-direction: column;
     gap: 1.5rem;