feat(aigc): add shared work top bar and back fixes

- add leftAction prop to AigcTopBar to switch between back arrow and home icon
- pass source=sharedWork query param when reLaunching home from shared work page
- update home page to detect shared work source, adjust top bar and back behavior
- add CSS styling for home top bar icon
- update root page back handler to exit WeChat mini program

src/pages-aigc/components/AigcTopBar/index.vue

@@ -2,7 +2,9 @@
   <view class="aigc-topbar" :style="topbarStyle">
     <view class="aigc-nav-row">
       <view class="aigc-topbar-back" @tap="emit('back')">
-        <uni-icons class="aigc-back-icon" fontFamily="znicons" size="22" color="#172033">
+        <uni-icons v-if="leftAction === 'home'" class="aigc-back-icon is-home" type="home-filled" size="20"
+          color="#172033" />
+        <uni-icons v-else class="aigc-back-icon" fontFamily="znicons" size="22" color="#172033">
           {{ zniconsMap["zn-nav-arrow-left"] }}
         </uni-icons>
       </view>
@@ -43,6 +45,11 @@ const props = defineProps({
     type: Boolean,
     default: true,
   },
+  leftAction: {
+    type: String,
+    default: "back",
+    validator: (value) => ["back", "home"].includes(value),
+  },
 });
 
 const emit = defineEmits(["back", "history", "recharge"]);

src/pages-aigc/components/AigcTopBar/styles/index.scss

@@ -48,6 +48,10 @@
   transform: translateX(-1px);
 }
 
+.aigc-back-icon.is-home {
+  transform: none;
+}
+
 .aigc-topbar-actions {
   flex: 1 1 auto;
   width: auto;