feat(chat): add composer action menu

src/app/chat/components/chat-input-bar.module.css

@@ -1,10 +1,10 @@
-/* ChatInputBar 输入栏容器样式（与 Dart chat_input_bar.dart 对齐） */
-
 /* Keyboard inset is a total bottom inset, not an addition to normal spacing. */
 
 .bar {
+  position: relative;
+  z-index: 5;
   flex: 0 0 auto;
-  padding: 0
+  padding: clamp(7px, 1.852vw, 10px)
     calc(var(--chat-inline-padding, 16px) + var(--app-safe-right, 0px))
     max(
       calc(var(--spacing-lg, 16px) + var(--app-safe-bottom, 0px)),
@@ -12,28 +12,43 @@
     )
     calc(var(--chat-inline-padding, 16px) + var(--app-safe-left, 0px));
   background: transparent;
-  transition: padding-top 0.2s ease, padding-bottom 0.2s ease,
-    background-color 0.2s ease, box-shadow 0.2s ease;
+  transition: padding-bottom 0.2s ease;
 }
 
-.barFocused {
-  padding-top: var(--spacing-md, 12px);
-  background: #feeff2;
-  box-shadow: 0 4px 12px var(--color-input-box-shadow, rgba(0, 0, 0, 0.1));
+.composer {
+  position: relative;
+  width: 100%;
 }
 
-/* 内层：白底 + 大圆角（Dart AppRadius.radius32）+ focused 时 accent 边框 */
 .row {
   display: flex;
   align-items: center;
-  gap: var(--spacing-sm, 8px);
-  padding: var(--spacing-sm, 8px);
-  background: #fff;
+  gap: 6px;
+  padding: 6px;
+  border: 1px solid rgba(94, 62, 73, 0.11);
   border-radius: var(--radius-full, 999px);
-  border: 1px solid transparent;
-  transition: border-color 0.2s ease;
+  background: rgba(255, 255, 255, 0.94);
+  box-shadow:
+    0 12px 30px rgba(75, 48, 57, 0.1),
+    0 2px 8px rgba(75, 48, 57, 0.05);
+  backdrop-filter: blur(18px);
+  transition:
+    border-color 0.2s ease,
+    box-shadow 0.2s ease,
+    background 0.2s ease;
 }
 
 .rowFocused {
-  border-color: var(--color-accent, #f84d96);
+  border-color: rgba(246, 87, 160, 0.62);
+  background: rgba(255, 255, 255, 0.98);
+  box-shadow:
+    0 0 0 3px rgba(246, 87, 160, 0.1),
+    0 14px 34px rgba(92, 52, 67, 0.12);
+}
+
+@media (max-width: 350px) {
+  .bar {
+    padding-right: calc(12px + var(--app-safe-right, 0px));
+    padding-left: calc(12px + var(--app-safe-left, 0px));
+  }
 }