fix: timeline filter dropdown clipped by overflow-hidden

Remove overflow-hidden from timeline page wrapper — it was clipping
the ProjectCombobox and ResourceCombobox dropdown menus. The
max-h-[100dvh] constraint combined with min-h-0 on flex children
is sufficient to keep the scroll container within viewport bounds.

Co-Authored-By: claude-flow <ruv@ruv.net>

apps/web/src/app/(app)/timeline/page.tsx

@@ -15,7 +15,7 @@ const TimelineView = dynamic(
 
 export default function TimelinePage() {
   return (
-    <div className="app-page flex max-h-[100dvh] flex-col gap-5 overflow-hidden pb-6">
+    <div className="app-page flex max-h-[100dvh] flex-col gap-5 pb-6">
       <div className="app-page-header">
         <div>
           <h1 className="app-page-title">Timeline</h1>