fix(map): 收敛 regionchange 回写回路，修复选中标点后地图抽动

选中标点后地图在左右/上下反复抽动，根因是视口回写形成了自激回路：
map 的 longitude/latitude/scale 绑定到 store，而 regionchange 又无条件把
地图当前中心点写回 store —— 写 store 触发地图移动，移动结束回传一个
「差一点点」的中心点，再写回，再移动。上一个提交把中心点改成从
detail.centerLocation 同步读取后，回路里原本靠 getCenterLocation 异步跳变
掩盖住的这一点噪声就直接闭合了。

两道闸：
- 只接受手势造成的变化。causedBy 为 update（我们自己改绑定值或调
  includePoints 触发）时 store 已是权威值，不回写。老基础库拿不到
  causedBy 时退化到下一道闸。
- 所有回写走 commitViewport，经 isSignificantViewportChange 过滤掉小于
  1e-4 度 / 0.01 级的变化。远小于任何一次真实拖动，足以吸收量化噪声。

顺带修一个 H5 构建回归（1bcdd40 引入）：uni 的 H5 路由生成器按路径推导
组件标识，pages/poi/detail 与 pages-poi/detail 都归一成 PagesPoiDetail，
重复声明导致 build:h5 失败。兼容跳板必须留在旧路径上，所以改名分包路由
pages-poi/detail -> pages-poi/poi-detail。

src/pages/assistant/index.vue

@@ -66,7 +66,7 @@ function openItinerary() {
 }
 
 function openDetail(poiId: string) {
-  uni.navigateTo({ url: `/pages-poi/detail?poiId=${encodeURIComponent(poiId)}` })
+  uni.navigateTo({ url: `/pages-poi/poi-detail?poiId=${encodeURIComponent(poiId)}` })
 }
 
 function focusOnMap(poiId: string) {

src/pages/check-in/records.vue

@@ -53,7 +53,7 @@ function openPoi(poiId: string) {
     })
     return
   }
-  uni.navigateTo({ url: `/pages-poi/detail?poiId=${encodeURIComponent(poiId)}` })
+  uni.navigateTo({ url: `/pages-poi/poi-detail?poiId=${encodeURIComponent(poiId)}` })
 }
 
 function loadProfile() {

src/pages/itinerary/index.vue

@@ -284,7 +284,7 @@ function openPlanner() {
 }
 
 function openDetail(poiId: string) {
-  uni.navigateTo({ url: `/pages-poi/detail?poiId=${encodeURIComponent(poiId)}` })
+  uni.navigateTo({ url: `/pages-poi/poi-detail?poiId=${encodeURIComponent(poiId)}` })
 }
 
 function focusOnMap(poiId: string) {

src/pages/map/index.vue

@@ -7,7 +7,7 @@ import PoiSummaryCard from '@/components/map/PoiSummaryCard.vue'
 import PageState from '@/components/poi/PageState.vue'
 import { getPoiRepository } from '@/data/poi'
 import { isTrustworthyCoordinate } from '@/domain/poi'
-import { buildMarkerIdMap, createPoiMarkers } from '@/services/map'
+import { buildMarkerIdMap, createPoiMarkers, isSignificantViewportChange } from '@/services/map'
 import { getSessionPlanningOrigin, loadPlan } from '@/services/travel-assistant'
 import { useLocationStore, useMapStore } from '@/stores'
 
@@ -292,7 +292,11 @@ function readEventCenter(detail: Record<string, unknown>): GeoPoint | null {
   return null
 }
 
-function updateViewport(event: { type: string, detail: Record<string, unknown> }) {
+function updateViewport(event: {
+  type: string
+  causedBy?: unknown
+  detail: Record<string, unknown>
+}) {
   const changeType = String(event.detail.type ?? event.type ?? '')
   if (changeType !== 'end')
     return
@@ -300,6 +304,15 @@ function updateViewport(event: { type: string, detail: Record<string, unknown> }
   if (!mapReady.value || navigating.value)
     return
 
+  // 只接受用户手势造成的视野变化。
+  //
+  // `causedBy: 'update'` 是我们自己改 longitude/latitude/scale 或调 includePoints
+  // 触发的回调 —— 此时 store 已经是权威值，再把地图回传的落点写回去会形成
+  // 「写 store → 地图动 → regionchange → 写 store」的自激回路，表现为地图反复抽动。
+  const causedBy = String(event.causedBy ?? event.detail.causedBy ?? '')
+  if (causedBy && causedBy !== 'drag' && causedBy !== 'scale' && causedBy !== 'gesture')
+    return
+
   const eventScale = Number(event.detail.scale)
   const fallbackScale = Number.isFinite(eventScale) ? eventScale : viewport.value.scale
 
@@ -319,6 +332,19 @@ function updateViewport(event: { type: string, detail: Record<string, unknown> }
   })
 }
 
+/**
+ * regionchange 回写 store 的唯一入口。
+ *
+ * 只有超过阈值的变化才写：地图的中心点是绑定到 store 的，写回去会再次触发地图移动，
+ * 把量化噪声原样回灌就会自激。见 isSignificantViewportChange 的注释。
+ */
+function commitViewport(longitude: number, latitude: number, scale: number) {
+  const next = { longitude, latitude, scale }
+  if (!isSignificantViewportChange(viewport.value, next))
+    return
+  mapStore.updateViewport(next)
+}
+
 function updateViewportWithScale(longitude: number, latitude: number, fallbackScale: number) {
   const context = mapContext.value as (ReturnType<typeof uni.createMapContext> & {
     getScale?: (options: {
@@ -328,21 +354,17 @@ function updateViewportWithScale(longitude: number, latitude: number, fallbackSc
   }) | null
 
   if (!context?.getScale) {
-    mapStore.updateViewport({ longitude, latitude, scale: fallbackScale })
+    commitViewport(longitude, latitude, fallbackScale)
     return
   }
 
   context.getScale({
     success: (result) => {
       const scale = Number(result.scale)
-      mapStore.updateViewport({
-        longitude,
-        latitude,
-        scale: Number.isFinite(scale) ? scale : fallbackScale,
-      })
+      commitViewport(longitude, latitude, Number.isFinite(scale) ? scale : fallbackScale)
     },
     fail: () => {
-      mapStore.updateViewport({ longitude, latitude, scale: fallbackScale })
+      commitViewport(longitude, latitude, fallbackScale)
     },
   })
 }
@@ -506,7 +528,7 @@ function openDetail(poiId: string) {
     return
   navigating.value = true
   uni.navigateTo({
-    url: `/pages-poi/detail?poiId=${encodeURIComponent(poiId)}`,
+    url: `/pages-poi/poi-detail?poiId=${encodeURIComponent(poiId)}`,
     complete: () => {
       setTimeout(() => {
         navigating.value = false

src/pages/poi/detail.vue

@@ -26,7 +26,7 @@ onLoad((query) => {
 
   // redirectTo 而非 navigateTo：跳板本身不该留在页面栈里。
   uni.redirectTo({
-    url: `/pages-poi/detail?poiId=${encodeURIComponent(rawPoiId)}`,
+    url: `/pages-poi/poi-detail?poiId=${encodeURIComponent(rawPoiId)}`,
     fail: () => {
       uni.showToast({ title: REDIRECT_FAILURE_TOAST, icon: 'none' })
       fallbackToMap()