feat(splash): add latest message entry

src/app/private-room/private-room-screen.module.css

@@ -40,8 +40,7 @@
 }
 
 .hero,
-.postsSection,
-.bottomNav {
+.postsSection {
   position: relative;
   z-index: 1;
 }
@@ -394,51 +393,6 @@
   margin-top: 16px;
 }
 
-.bottomNav {
-  position: fixed;
-  right: max(calc((100vw - var(--app-max-width, 540px)) / 2), 0px);
-  bottom: 0;
-  left: max(calc((100vw - var(--app-max-width, 540px)) / 2), 0px);
-  display: grid;
-  grid-template-columns: 1fr 1fr;
-  gap: 10px;
-  box-sizing: border-box;
-  width: min(100vw, var(--app-max-width, 540px));
-  margin: 0 auto;
-  padding:
-    10px
-    calc(var(--app-safe-right, 0px) + 14px)
-    calc(var(--app-safe-bottom, 0px) + 10px)
-    calc(var(--app-safe-left, 0px) + 14px);
-  border-top: 1px solid rgba(44, 29, 34, 0.08);
-  background: rgba(255, 255, 255, 0.86);
-  box-shadow: 0 -18px 48px rgba(53, 34, 40, 0.09);
-  backdrop-filter: blur(18px);
-}
-
-.navButton {
-  display: flex;
-  min-height: 54px;
-  align-items: center;
-  justify-content: center;
-  gap: 8px;
-  border: 1px solid transparent;
-  border-radius: 18px;
-  background: transparent;
-  color: #8d777e;
-  cursor: pointer;
-  font: inherit;
-  font-size: clamp(12px, 2.963vw, 14px);
-  font-weight: 820;
-}
-
-.navButtonActive {
-  border-color: rgba(255, 116, 159, 0.2);
-  background: linear-gradient(135deg, rgba(255, 244, 236, 0.98), rgba(255, 232, 241, 0.96));
-  color: #201417;
-  box-shadow: 0 10px 24px rgba(255, 116, 159, 0.12);
-}
-
 .dialogOverlay {
   position: fixed;
   inset: 0;
@@ -529,14 +483,12 @@
 
 .primaryCta:active,
 .lockedPreview:active,
-.loadMoreButton:active,
-.navButton:active {
+.loadMoreButton:active {
   transform: translateY(1px) scale(0.99);
 }
 
 .primaryCta:focus-visible,
 .lockedPreview:focus-visible,
-.navButton:focus-visible,
 .loadMoreButton:focus-visible,
 .dialogPrimary:focus-visible,
 .dialogSecondary:focus-visible {