fix(ui): 空态居中、大运页去重、星历加日历、顶栏动作按 46px 收

真机走查四条：

1. 空态不居中——问候+输入框+pill 整组贴在屏幕底部。加一个可压缩的
   配重行，让 chat-panel 变成 46px/1fr/auto/1fr，两个 1fr 抵消，
   整组居中；composer 仍是同一个 DOM 位置，不重挂载。

2. 大运页「Vimshottari」出现两遍、「当前 当前 Chara 段…」两个当前。
   两条轨道的 method 与自身 title 同字符串，method 只在不同时才渲染；
   兜底文案自带的「当前」去掉——它同时被参数表当「当前大运」的值用，
   不能把前缀塞进数据。

3. 星历只能一天一天点。日期改成可点的日历弹层，复用出生日期字段
   同一套 Calendar+Popover。新增 parseEphemerisDate/toEphemerisDate，
   都走本地日历字段、不经 UTC，避免跨时区差一天。

4. 「生成完整报告」在 46px 顶栏里是 44px 实心大按钮，像个横幅 CTA。
   顶栏作用域内动作统一 32px + outline，触摸目标靠 ::after 扩热区补。

测试 3372，fail 仍 31 且与基线逐条一致；四个路由标记不变；
CSS gzip 40,080。

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0193vBv6w5MV2cifdTUu9H5P

frontend/src/components/chart-page/chart-dasha-tab.tsx

@@ -12,8 +12,12 @@ function Track({
     <section className="chart-page-dasha-track">
       <header>
         <h3>{title}</h3>
-        <p>{method}</p>
-        <p>当前 {currentLabel}</p>
+        {/* Both tracks ship a `method` equal to their own title, which rendered
+            the name twice; only show it when it actually adds something. */}
+        {method && method !== title ? <p>{method}</p> : null}
+        {/* No space, and no second 当前: the fallback labels used to start with
+            it themselves, which read as 「当前 当前 Chara 段…」. */}
+        <p>当前{currentLabel}</p>
       </header>
       <ol className="chart-page-dasha-list">
         {periods.map((period) => (

frontend/src/components/ephemeris/ephemeris-page.tsx

@@ -3,7 +3,11 @@
 import Link from "next/link";
 import { useCallback, useEffect, useRef, useState } from "react";
 
+import { CalendarIcon } from "lucide-react";
+import { zhCN } from "date-fns/locale";
 import { Button } from "@/components/ui/button";
+import { Calendar } from "@/components/ui/calendar";
+import { Popover, PopoverContent, PopoverTrigger } from "@/components/ui/popover";
 import { SecondaryShell } from "@/components/secondary-shell";
 import { setComposerDraft } from "@/lib/composer-draft";
 import { parseEphemerisOkResponse, type EphemerisOkResponse } from "@/lib/ephemeris-contract";
@@ -15,6 +19,8 @@ import {
   formatHouse,
   qualityLabel,
   shiftEphemerisDate,
+  parseEphemerisDate,
+  toEphemerisDate,
 } from "@/lib/ephemeris-view";
 
 type PageState =
@@ -94,6 +100,7 @@ export function EphemerisPage() {
       onPrevious={() => activeDate && changeDate(shiftEphemerisDate(activeDate, -1))}
       onNext={() => activeDate && changeDate(shiftEphemerisDate(activeDate, 1))}
       onToday={() => today && changeDate(today)}
+      onSelectDate={(iso) => changeDate(iso)}
       onAsk={askAboutDate}
     />
   );
@@ -106,6 +113,7 @@ export function EphemerisView(props: {
   readonly onPrevious: () => void;
   readonly onNext: () => void;
   readonly onToday: () => void;
+  readonly onSelectDate: (iso: string) => void;
   readonly onAsk: () => void;
 }) {
   const factors = props.payload?.panchanga.available ? props.payload.panchanga.factors : [];
@@ -114,6 +122,8 @@ export function EphemerisView(props: {
   const eventsUnavailable = !props.payload || props.payload.events.status === "unavailable";
   const events = props.payload?.events.status === "ok" ? props.payload.events.items : [];
   const isToday = Boolean(props.date) && props.date === props.today;
+  const [pickerOpen, setPickerOpen] = useState(false);
+  const selectedDay = props.date ? parseEphemerisDate(props.date) : undefined;
 
   return (
     <SecondaryShell
@@ -142,7 +152,41 @@ export function EphemerisView(props: {
           >
             <span aria-hidden="true">‹</span>
           </Button>
-          <p className="ephemeris-date-label">{props.date ? formatEphemerisDate(props.date) : ""}</p>
+          {/* The date itself opens a month grid. Stepping a day at a time was the
+              only way to reach another date, so anything more than a few days
+              away meant repeated clicking. Same Calendar + Popover the birth
+              date field uses. */}
+          <Popover open={pickerOpen} onOpenChange={setPickerOpen}>
+            <PopoverTrigger
+              render={<Button
+                type="button"
+                variant="ghost"
+                className="ephemeris-date-label"
+                aria-label={`${props.date ? formatEphemerisDate(props.date) : ""}，选择日期`}
+              />}
+            >
+              <CalendarIcon aria-hidden="true" />
+              <span>{props.date ? formatEphemerisDate(props.date) : ""}</span>
+            </PopoverTrigger>
+            <PopoverContent align="center" className="w-auto p-0">
+              <Calendar
+                mode="single"
+                locale={zhCN}
+                className="[--cell-size:2.5rem]"
+                selected={selectedDay}
+                defaultMonth={selectedDay}
+                captionLayout="dropdown"
+                navLayout="after"
+                startMonth={new Date(1900, 0)}
+                endMonth={new Date(2100, 11)}
+                onSelect={(next) => {
+                  if (next === undefined) return;
+                  setPickerOpen(false);
+                  props.onSelectDate(toEphemerisDate(next));
+                }}
+              />
+            </PopoverContent>
+          </Popover>
           <Button
             type="button"
             variant="outline"

frontend/src/components/personal-report/generate-personal-report-button.tsx

@@ -192,15 +192,20 @@ export function GeneratePersonalReportButton({
   }
 
   return (
+    /* Sized for the 46px page header it now lives in. It used to be the
+       default filled Button at full height, which read as a banner CTA
+       floating in the top-right corner rather than the header's own action. */
     <Button
       type="button"
+      variant="outline"
+      size="sm"
       className="shrink-0 whitespace-nowrap"
       onClick={() => void handleGenerate()}
       disabled={submitting}
       title="根据已保存的具体出生分钟生成完整报告；未校正会标明方向性参考"
     >
       <FileText aria-hidden="true" />
-      {submitting ? "正在创建…" : "生成完整报告"}
+      {submitting ? "正在创建…" : "生成报告"}
     </Button>
   );
 }