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/components/time-tracking/TimeEntryContextMenu.vue

@@ -24,7 +24,7 @@
             </button>
             <button
                 v-if="entry"
-                class="flex w-full items-center gap-2 px-4 py-2 text-sm text-red-600 hover:bg-red-50"
+                class="flex w-full items-center gap-2 px-4 py-2 text-sm text-[#E2953C] hover:bg-orange-50"
                 @click="onDelete"
             >
                 <Icon name="mdi:delete-outline" size="16" />