style(frontend) : apply UI corrections from design review

- Page titles in blue primary (#222783)
- Double main content margins (px-16 py-24)
- Remove blue border above sidebar timer
- Remove project color dot, use project color on title text
- All delete buttons/icons orange (#E2953C)
- Fix collapsed sidebar logo (object-cover object-left)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/layouts/default.vue

@@ -16,7 +16,7 @@
                         v-else
                         src="/malio.png"
                         alt="Logo"
-                        class="h-8 w-8 object-contain"
+                        class="h-8 w-8 object-cover object-left"
                     />
                 </div>
                 <nav class="flex-1 overflow-hidden" :class="ui.sidebarCollapsed ? 'px-1 pb-6' : 'px-4 pb-6'">
@@ -77,7 +77,7 @@
                     />
                 </nav>
 
-                <div class="px-4 py-3 border-t border-secondary-500">
+                <div class="px-4 py-3">
                     <SidebarTimer :collapsed="ui.sidebarCollapsed" />
                 </div>
 
@@ -98,7 +98,7 @@
 
             <div class="h-full flex-1 overflow-hidden flex flex-col">
                 <AppTopNav :user="auth.user" />
-                <main class="flex-1 overflow-y-auto px-8 py-12">
+                <main class="flex-1 overflow-y-auto px-16 py-24">
                     <slot/>
                 </main>
             </div>