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/TimeEntryDrawer.vue

@@ -84,7 +84,7 @@
                 <button
                     v-if="isEditing"
                     type="button"
-                    class="rounded-md bg-red-500 px-4 py-2 text-sm font-semibold text-white hover:bg-red-600 transition"
+                    class="rounded-md bg-[#E2953C] px-4 py-2 text-sm font-semibold text-white hover:bg-[#c97a2f] transition"
                     @click="onDelete"
                 >
                     Supprimer