feat(ui): optional gender radio in the people form and 个人资料 (T2)

One ProfileGenderField (女 / 男 / 不填, 44px, one hint line) in the
people-archive edit form (saved with the form, 不填 → null) and in
设置 → 个人资料 for the owner (saves on its own PATCH; birth-data saves never
send gender). The detail card shows 性别 (未填 when empty). Not asked in
onboarding. DESIGN/VOICE updated; 390/1280 screenshots with fictional data.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017eEAG8HD3mm8gsKXgk8uU8

frontend/DESIGN.md

@@ -655,7 +655,7 @@ page. Three parts now, in reading order:
 - **Width / height:** desktop `width: min(100vw - 32px, 880px)`, with `height: min(84vh, 640px)` as the base and `min(84dvh, 640px)` applied inside `@supports (height: 1dvh)`. The right content pane uses 32px horizontal and bottom inset on desktop. All four panes share one class (`.settings-modal`), so switching panes cannot change the frame. At ≤767px the dialog is full-screen with four equal tabs along the top and 16px content inset.
 - **Pane menu states:** default is transparent with secondary ink; hover is a 55% wash of `--color-canvas-muted` keeping secondary ink; current is the solid muted surface with primary ink. No accent bar, no trailing navigation chevron, and no weight change — hierarchy here comes from ink rank and surface, matching “Hierarchy inside the nav comes from ink rank, not hue”. The sidebar's 2px `--sidebar-ring` on the active session is deliberately **not** changed to match; the two surfaces read differently on purpose until that is revisited.
 - **Content width:** the 880px frame now gives the content pane a deliberate inset instead of leaving controls against the divider. Form panes (个人资料, 通用设置) cap their children at 560px and stay left aligned (`.settings-dialog-content--form > *`); list panes (星盘资料, 账户与点数) stay full-bleed within the inset so tables and card grids keep their columns. The cap sits on the children of the scroll container only — never on `.settings-modal` or `.account-settings-shell` — so it cannot make the frame resize between panes (BUG-554 / BUG-698).
-- **Personal profile:** one row of avatar editing (56px preview, eight palettes, 换一个形象) plus nickname and login email. The header uses the product-level “设置” eyebrow above the current pane title; there is no duplicate 管理星盘资料 button.
+- **Personal profile:** one row of avatar editing (56px preview, eight palettes, 换一个形象) plus nickname and login email. Below them sits **性别（选填）** (2026-09-27, TASK-consult-gender-optional): three 44px choices 女 / 男 / 不填 in one row (the birth-time range chip look: `--color-border`, selected `--color-action` border + `--color-action-soft`), then one caption line 「用于婚恋解读里判断夫星 / 妻星，不填也能用。」. A choice saves at once (like the avatar palette) and shows 「已保存。」; the choices are disabled while saving, no spinner. This is the only place the owner sets it; onboarding never asks. The header uses the product-level “设置” eyebrow above the current pane title; there is no duplicate 管理星盘资料 button.
 - **Chart archive (`/people`):** a static secondary page beside 星盘 / 星历 / 我的报告. Self is the first row and cannot be deleted. Each other row is a name plus birth facts, with no relationship field. Detail shows the reported time and the chart time separately, then place and ayanamsa. Shortcuts are 和 TA 对话, 看星盘, 生成报告, and 和我合盘. Adding a sixth person is disabled with 「最多保存 5 个人的星盘」. Delete confirms with the session and report counts before the server removes them together. There is no 「设为默认」 and no 「当前默认」 badge.
 - **Subject switcher:** the same control sits beside the title on chat, chart, ephemeris, reports, and the archive. It is not in the sidebar header. Choosing someone in a chat that already has messages switches the current person and opens an empty chat. An empty chat rebinds in place. The list shows at most five people.
 - **States:** open, pane switch, list / self / other / add, saving, success, and error.
@@ -972,7 +972,8 @@ Three product rules for assistant markdown in `.message-markdown` (BUG-962 / 963
 - **1024px 及以上：两栏。** 左列表（18–22rem），右详情；「‹ 返回」隐藏。右栏正在看的那一行用中性浅底（`is-open`），强调色只给当前人物。
 - **列表行**（`.people-archive-row`，最小 64px）：40px 圆形首字头像（本人写「我」）+ 名字（本人后跟灰底「本人」标签）+ 一行等宽 `tabular-nums` 的「出生日期 · 排盘时间 · 城市」+ 行尾「›」。资料不完整时这一行写「这份资料还不完整」。**当前人物**（`is-current`，与顶栏「当前星盘」同一个人）是 `--color-action-strong` 描边 + `--color-action-soft` 底。
 - **添加**：虚线卡片「＋ 添加一个人」（48px，`--color-border-strong` 虚线，文字 `--color-action`），下面小字「还可以保存 N 个人」，N 仍是 `MAX_SAVED_SUBJECTS - 人数`；到顶时换成原来的限额句并禁用。
-- **详情卡**：头部 48px 头像 + 名字 +「本人 · 出生地」（他人只写出生地）；两格时间卡「填报时间」「排盘时间」，等宽大号数字。只有采用或确认了**校正结果**（状态 accepted / confirmed **且**有校正案例）时，排盘卡换成 `--color-success` 描边 + `--color-success-muted` 底，标签写「排盘时间 · 已校正」——旧资料读回时的 `confirmed` 兜底不算。下面是出生日期与岁差（显示「Raman（默认）」这类设置里的名字，不露小写键），再下面三个等宽快捷入口「和 TA 对话 / 看星盘 / 生成报告」（图标用侧栏同款 lucide）。他人另有「和我合盘」与「编辑」；本人底部灰字「本人不能删除」。
+- **详情卡**：头部 48px 头像 + 名字 +「本人 · 出生地」（他人只写出生地）；两格时间卡「填报时间」「排盘时间」，等宽大号数字。只有采用或确认了**校正结果**（状态 accepted / confirmed **且**有校正案例）时，排盘卡换成 `--color-success` 描边 + `--color-success-muted` 底，标签写「排盘时间 · 已校正」——旧资料读回时的 `confirmed` 兜底不算。下面是出生日期、岁差（显示「Raman（默认）」这类设置里的名字，不露小写键）与性别（「女」「男」，没填写「未填」；本人在值下面加一行灰色小字「在「设置 → 个人资料」里改」，这一页不给本人第二个性别入口），再下面三个等宽快捷入口「和 TA 对话 / 看星盘 / 生成报告」（图标用侧栏同款 lucide）。他人另有「和我合盘」与「编辑」；本人底部灰字「本人不能删除」。
+- **编辑表单里的性别（选填）**（2026-09-27）：放在出生地点之后、岁差之前，与个人资料同一个控件（女 / 男 / 不填，44px，一行说明），随「保存」一起提交；选「不填」存为空。
 - **删除只在编辑视图底部**，单独一张卡，删除确认、用量计数、查询失败句全部沿用。
 - **头像颜色**：本人用 `--color-action-strong` + `--color-on-dark`（同账户首字圆）；其他人按 id 稳定地取四个元素色 `--color-element-fire / earth / air / water` 之一，字用 `--color-ink`。不新造色值。