fix: align auction/themes/popularity header right-side icons with other pages

Remove the stale body[data-active-view] .overview-strip { flex: 0 0 auto }
override from the three market-insight page stylesheets. Since the merged
header (B-147) moved the market tape into .app-header, this rule no longer
targets the old in-main overview strip and instead overrides the shared
shell rule (.app-header .overview-strip { flex: 1 0 auto }), which pushed the
header-actions icons off the right edge on auction, theme library and
popularity pages. Deleting the override lets the shared shell owner drive the
tape growth so the right-side icons sit flush like every other page.

Regenerate architecture-inventory.json line metrics for the CSS change.

Co-authored-by: multica-agent <github@multica.ai>

app/frontend/pages/themes/foundation.css

@@ -1089,10 +1089,6 @@
     overflow: hidden;
   }
 
-  body[data-active-view="themeLibraryView"] .overview-strip {
-    flex: 0 0 auto;
-  }
-
   body[data-active-view="themeLibraryView"] #themeLibraryView.active-view {
     min-height: 0px;