fix(rectification): label declared birth time as record or estimate (BUG-690)

Hospital records, family estimates and period-only windows now keep distinct copy on the board and range card. Scoring still uses the reported clock as the search-window centre. Hospital minutes outside the current range are stated with the offset and no preference.

frontend/DESIGN.md

@@ -241,7 +241,7 @@ The birth-time rectification session is the consultation transcript plus a house
 | stopped | the row settles with what streamed; a grey caption “已停止，已生成的内容保留；本次不会扣点。” under the body, never `role="alert"` | enabled |
 
 - **Rules:** a follow-up turn continues on the live row already in place; `busy` never drops in the middle of a chain. No copy may ask the reader to wait for the server; a gap is a live row with retries, then a repair button. A hydration that timed out is the same gap. A 402 shows “校正点数不足，正在前往兑换…” for 600ms before the page leaves.
-- **Board:** before any candidate exists the header clock shows the declared birth minute and the body reads “填报出生时间 HH:MM” / “回答几个问题后，这里会显示宫位随时间的变化。”; the column narrows to `minmax(16rem, 18rem)` (`is-board-empty`) and widens once a result arrives. No house table is invented for the declared time; the snapshot API does not provide one.
+- **Board:** before any candidate exists the header clock shows the declared birth minute and the body names it by source — “出生记录时间 HH:MM”, “你填的大概时间 HH:MM”, or “你给的时间段” — then “回答几个问题后，这里会显示宫位随时间的变化.”; the column narrows to `minmax(16rem, 18rem)` (`is-board-empty`) and widens once a result arrives. No house table is invented for the declared time; the snapshot API does not provide one. The range card may add a caption comparing the declared clock to the current range (“与你填的大概时间相差 N 分钟”, or a hospital-record offset with no preference).
 - **Accessibility:** the sidebar opening note sets `aria-busy`; the live row is the timeline row (`role="status"` shimmer label); the repair and start actions are real 44px buttons.
 
 ### Birth time intake