diff --git a/src/components/Paginator.vue b/src/components/Paginator.vue
new file mode 100644
index 0000000..de8aaf7
--- /dev/null
+++ b/src/components/Paginator.vue
@@ -0,0 +1,168 @@
+<template>
+  <!--
+    通用分页器(F-260621-02 P3 分页 UI 基建)。
+    纯客户端切片分页:父级传 total(总数) + v-model:page(当前页,1 起) +
+    v-model:pageSize(每页条数),本组件只管 UI,不做数据请求(数据量 ~15 前瞻基建)。
+
+    向后兼容铁律:pageSize=0 → 不分页(全量),整组件隐藏,等价改造前行为。
+    用户从下拉选具体 N → 触发分页(切换 page 重置到第 1 页由父级 watch 控制)。
+  -->
+  <div v-if="pageSize > 0 && totalPages > 0" class="paginator">
+    <div class="page-size-group">
+      <span class="paginator-label">{{ $t('common.pagination.perPage') }}</span>
+      <select
+        class="page-size-select"
+        :value="pageSize"
+        @change="onPageSizeChange(($event.target as HTMLSelectElement).value)"
+      >
+        <option v-for="opt in pageSizeOptions" :key="opt" :value="opt">{{ opt }}</option>
+      </select>
+      <span class="paginator-total">
+        {{ $t('common.pagination.total', { n: total }) }}
+      </span>
+    </div>
+
+    <div class="page-nav">
+      <button
+        class="page-btn"
+        :disabled="page <= 1"
+        @click="goTo(page - 1)"
+      >{{ $t('common.pagination.prev') }}</button>
+
+      <button
+        v-for="p in pageNumbers"
+        :key="p"
+        class="page-btn page-num"
+        :class="{ active: p === page }"
+        @click="goTo(p)"
+      >{{ p }}</button>
+
+      <button
+        class="page-btn"
+        :disabled="page >= totalPages"
+        @click="goTo(page + 1)"
+      >{{ $t('common.pagination.next') }}</button>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { computed } from 'vue'
+
+const props = withDefaults(defineProps<{
+  /** 数据总数(父级传当前过滤后的总数) */
+  total: number
+  /** 每页条数;0 = 不分页(整组件隐藏,等价旧行为) */
+  pageSize: number
+  /** 当前页码(1 起) */
+  page: number
+  /** 每页条数候选(默认 10/20/50) */
+  pageSizeOptions?: number[]
+}>(), {
+  pageSizeOptions: () => [10, 20, 50],
+})
+
+const emit = defineEmits<{
+  'update:page': [page: number]
+  'update:pageSize': [size: number]
+}>()
+
+// 总页数:pageSize=0 已被 v-if 拦截,此处保证 pageSize ≥ 1。
+const totalPages = computed(() => {
+  if (props.pageSize <= 0) return 0
+  return Math.max(1, Math.ceil(props.total / props.pageSize))
+})
+
+// 简单页码序列:数据量小,全列(1..totalPages),不做省略窗口(7 页内可读)。
+// 若数据量未来增长到几十页,再加窗口折叠逻辑。
+const pageNumbers = computed(() => {
+  const arr: number[] = []
+  for (let i = 1; i <= totalPages.value; i++) arr.push(i)
+  return arr
+})
+
+function goTo(p: number) {
+  if (p < 1 || p > totalPages.value) return
+  emit('update:page', p)
+}
+
+function onPageSizeChange(val: string) {
+  const n = Number(val)
+  if (!Number.isFinite(n) || n < 0) return
+  emit('update:pageSize', n)
+  // 切换每页条数后页码可能越界,重置到第 1 页(父级也可自行 watch 处理)
+  emit('update:page', 1)
+}
+</script>
+
+<style scoped>
+.paginator {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  flex-wrap: wrap;
+  gap: 8px;
+  margin-top: var(--df-gap-grid, 16px);
+  padding: 8px 4px;
+  font-size: 12px;
+  color: var(--df-text-dim);
+}
+
+.page-size-group {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+}
+
+.paginator-label { white-space: nowrap; }
+
+.page-size-select {
+  padding: 3px 8px;
+  border: 0.5px solid var(--df-border);
+  border-radius: var(--df-radius-sm);
+  background: var(--df-bg);
+  color: var(--df-text);
+  font-size: 12px;
+  cursor: pointer;
+}
+
+.paginator-total { color: var(--df-text-dim); }
+
+.page-nav {
+  display: flex;
+  align-items: center;
+  gap: 4px;
+}
+
+.page-btn {
+  min-width: 28px;
+  padding: 3px 8px;
+  border: 0.5px solid var(--df-border);
+  border-radius: var(--df-radius-sm);
+  background: transparent;
+  color: var(--df-text-secondary);
+  font-size: 12px;
+  cursor: pointer;
+  transition: all 0.15s;
+}
+
+.page-btn:hover:not(:disabled) {
+  background: rgba(108, 99, 255, 0.06);
+  color: var(--df-text);
+}
+
+.page-btn.active {
+  background: var(--df-accent);
+  color: #fff;
+  border-color: var(--df-accent);
+}
+
+.page-btn:disabled {
+  opacity: 0.4;
+  cursor: not-allowed;
+}
+
+@media (max-width: 600px) {
+  .paginator { justify-content: center; }
+}
+</style>
diff --git a/src/i18n/en/common.ts b/src/i18n/en/common.ts
index d517b39..c53d03e 100644
--- a/src/i18n/en/common.ts
+++ b/src/i18n/en/common.ts
@@ -14,5 +14,12 @@ export default {
     close: 'Close',
     loading: 'Loading…',
     unknownError: 'Unknown error',
+    // Pagination UI (F-260621-02 P3 baseline; off by default, opt-in per-page)
+    pagination: {
+      prev: 'Prev',
+      next: 'Next',
+      perPage: 'Per page',
+      total: '{n} total',
+    },
   },
 }
diff --git a/src/i18n/zh-CN/common.ts b/src/i18n/zh-CN/common.ts
index 8abb61d..f91d864 100644
--- a/src/i18n/zh-CN/common.ts
+++ b/src/i18n/zh-CN/common.ts
@@ -14,5 +14,12 @@ export default {
     close: '关闭',
     loading: '加载中…',
     unknownError: '未知错误',
+    // 分页 UI(F-260621-02 P3 基建,默认不分页,用户选每页 N 条才触发)
+    pagination: {
+      prev: '上一页',
+      next: '下一页',
+      perPage: '每页',
+      total: '共 {n} 条',
+    },
   },
 }
diff --git a/src/views/Ideas.vue b/src/views/Ideas.vue
index 9d0905c..a4522d5 100644
--- a/src/views/Ideas.vue
+++ b/src/views/Ideas.vue
@@ -52,7 +52,7 @@
           <div v-else-if="filteredIdeas.length === 0" class="empty-state">{{ $t('ideas.listEmpty') }}</div>
           <template v-else>
             <div
-              v-for="idea in filteredIdeas"
+              v-for="idea in pagedIdeas"
               :key="idea.id"
               class="idea-card"
               :class="{ selected: selectedId === idea.id }"
@@ -70,6 +70,12 @@
             </div>
           </template>
         </div>
+        <!-- 分页器(F-260621-02 P3):pageSize=0 不分页(全量,等价旧行为);用户选 N 条触发客户端切片 -->
+        <Paginator
+          v-model:page="page"
+          v-model:pageSize="pageSize"
+          :total="filteredIdeas.length"
+        />
       </section>
 
       <!-- 右侧：灵感详情 -->
@@ -132,6 +138,7 @@ import { stripMd } from '../utils/markdown'
 import ConfirmDialog from '../components/ConfirmDialog.vue'
 import IdeaDetail from '../components/ideas/IdeaDetail.vue'
 import { useConfirm } from '../composables/useConfirm'
+import Paginator from '../components/Paginator.vue'
 
 const { t } = useI18n()
 const router = useRouter()
@@ -149,6 +156,10 @@ const searchQuery = ref('')
 // 列表排序:score 高分在前 / time 新在前(默认 score,避免高分灵感被淹没)
 const sortMode = ref<'score' | 'time'>('score')
 
+// 分页(F-260621-02 P3):pageSize=0 → 全量(向后兼容,等价改造前);用户选 N → 客户端切片
+const page = ref(1)
+const pageSize = ref(0)
+
 // ── 新建灵感模态框 ──
 const showCaptureModal = ref(false)
 const newIdeaTitle = ref('')
@@ -218,9 +229,9 @@ async function reloadIdeas(immediate = false) {
 }
 
 // 筛选/排序变化即时重载;keyword 输入防抖重载
-watch(activeFilter, () => void reloadIdeas(true))
-watch(sortMode, () => void reloadIdeas(true))
-watch(searchQuery, () => void reloadIdeas(false))
+watch(activeFilter, () => { page.value = 1; void reloadIdeas(true) })
+watch(sortMode, () => { page.value = 1; void reloadIdeas(true) })
+watch(searchQuery, () => { page.value = 1; void reloadIdeas(false) })
 
 const filteredIdeas = computed(() => {
   let ideas = store.ideas
@@ -237,6 +248,13 @@ const filteredIdeas = computed(() => {
   return ideas
 })
 
+// 分页视图(F-260621-02 P3):pageSize=0 → 全量(等价改造前);否则取当前页窗口。
+const pagedIdeas = computed(() => {
+  if (pageSize.value <= 0) return filteredIdeas.value
+  const start = (page.value - 1) * pageSize.value
+  return filteredIdeas.value.slice(start, start + pageSize.value)
+})
+
 const currentIdea = computed(() => {
   if (!selectedId.value) return null
   return store.ideas.find(i => i.id === selectedId.value) ?? null
diff --git a/src/views/Projects.vue b/src/views/Projects.vue
index f748885..92fab5e 100644
--- a/src/views/Projects.vue
+++ b/src/views/Projects.vue
@@ -140,9 +140,16 @@
 
     <!-- 项目卡片网格(单卡片渲染抽至 components/project/ProjectCard.vue,删除走 emit 回父处理) -->
     <div class="project-grid">
-      <ProjectCard v-for="project in store.projects" :key="project.id" :project="project" @delete="handleDelete" />
+      <ProjectCard v-for="project in pagedProjects" :key="project.id" :project="project" @delete="handleDelete" />
     </div>
 
+    <!-- 分页器(F-260621-02 P3):pageSize=0 不分页(全量,等价旧行为);用户选 N 条触发客户端切片 -->
+    <Paginator
+      v-model:page="page"
+      v-model:pageSize="pageSize"
+      :total="store.projects.length"
+    />
+
     <!-- 空状态 -->
     <div v-if="!store.loading && store.projects.length === 0" class="empty-state">
       {{ $t('projects.empty') }}
@@ -165,6 +172,7 @@ import { projectApi } from '@/api'
 import { formatDate } from '@/utils/time'
 import ConfirmDialog from '@/components/ConfirmDialog.vue'
 import ProjectCard from '@/components/project/ProjectCard.vue'
+import Paginator from '@/components/Paginator.vue'
 import { useConfirm } from '@/composables/useConfirm'
 import type { ProjectRecord } from '@/api/types'
 import type { ScannedProjectItem } from '@/api/project'
@@ -172,6 +180,17 @@ import type { ScannedProjectItem } from '@/api/project'
 const store = useProjectStore()
 const { t } = useI18n()
 
+// 分页(F-260621-02 P3):pageSize=0 → 全量(向后兼容,等价改造前);用户选 N → 客户端切片
+const page = ref(1)
+const pageSize = ref(0)
+
+// 分页视图:pageSize=0 → 全量;否则取当前页窗口
+const pagedProjects = computed(() => {
+  if (pageSize.value <= 0) return store.projects
+  const start = (page.value - 1) * pageSize.value
+  return store.projects.slice(start, start + pageSize.value)
+})
+
 // 状态映射统一走 ../constants/project(与 ProjectDetail/Tasks/Dashboard 一致)
 // formatDate 由 ../utils/time 提供（统一毫秒字符串解析，根治 Invalid Date）
 
diff --git a/src/views/Tasks.vue b/src/views/Tasks.vue
index 0925f69..a798703 100644
--- a/src/views/Tasks.vue
+++ b/src/views/Tasks.vue
@@ -77,6 +77,13 @@
       </template>
     </div>
 
+    <!-- 分页器(F-260621-02 P3):pageSize=0 不分页(全量,等价旧行为);用户选 N 条触发客户端切片 -->
+    <Paginator
+      v-model:page="page"
+      v-model:pageSize="pageSize"
+      :total="store.tasks.length"
+    />
+
     <!-- 新建任务模态框 -->
     <div class="modal-overlay" v-if="showCreateModal" @click.self="showCreateModal = false">
       <div class="modal-box">
@@ -115,6 +122,7 @@ import { useProjectStore } from '@/stores/project'
 import { formatRelative } from '@/utils/time'
 import { taskStatusLabel as statusLabel, taskStatusClass, priorityLabel, priorityClass } from '../constants/project'
 import type { TaskRecord, TaskQuery } from '@/api/types'
+import Paginator from '../components/Paginator.vue'
 
 const router = useRouter()
 const store = useProjectStore()
@@ -125,6 +133,10 @@ const activeStatus = ref('all')
 // Y-2: 本视图加载态(loadTasks 不翻转全局 state.loading,故用局部 ref 精确反映任务加载)
 const loading = ref(false)
 
+// 分页(F-260621-02 P3):pageSize=0 → 全量(向后兼容,等价改造前);用户选 N → 客户端切片
+const page = ref(1)
+const pageSize = ref(0)
+
 // ── 新建任务模态框 ──
 const showCreateModal = ref(false)
 const newTaskProjectId = ref('')
@@ -176,7 +188,12 @@ const projectIcons: Record<string, string> = {
 // 注:project 维度同样下沉后端(activeProject watch 构造 query),store.tasks 已按
 // project_id 过滤。groupMap 保留分组逻辑(展示按项目聚合),无需再 filter。
 const filteredGroups = computed(() => {
-  const filtered = store.tasks
+  // 分页(F-260621-02):pageSize=0 → 全量切片(等价改造前);否则取当前页窗口。
+  // 先对扁平 store.tasks 切片,再分组(保持按项目聚合语义,分组在页窗口内)。
+  const all = store.tasks
+  const filtered = pageSize.value > 0
+    ? all.slice((page.value - 1) * pageSize.value, page.value * pageSize.value)
+    : all
 
   const groupMap = new Map<string, TaskRecord[]>()
   for (const task of filtered) {
@@ -254,6 +271,7 @@ async function confirmCreate() {
 // F-260621-02(P1 status 下沉):重载 query 同时含 project_id + status,前端不再 filter status
 watch(activeProject, () => {
   store.setActiveTaskProject(activeProject.value)
+  page.value = 1
   loading.value = true
   store.loadTasks(buildTaskQuery()).finally(() => { loading.value = false })
 })
@@ -262,6 +280,7 @@ watch(activeProject, () => {
 // 并登记到 store 供 AR-11 listener 复用同一筛选(保 B-29 契约)
 watch(activeStatus, (key) => {
   store.setActiveTaskStatus(key)
+  page.value = 1
   loading.value = true
   store.loadTasks(buildTaskQuery()).finally(() => { loading.value = false })
 })