feat(mocks): the deadline as a window, and a way into places from the desk

[tkgstrator]

Mocks and design only. No app code changes — the screens still draw the old single line.

1. The deadline becomes a window

The board asserted a death estimate the player could not yet know.

The Tsukimisou record says the body was found around 20:30. The chart drew 20:15
「死亡推定」from the first turn, before anyone had examined anything or spoken to the
doctor. The data was never at fault — db/scenarios/tsukimisou.yaml has carried
foundAt: "20:30" and estimatedDeathAt: "20:15" separately all along, and
scenario-definition.ts says in as many words that they are different things. Only the
drawing collapsed them, and foundAt reached nothing but the examination prompt: the
model knew, the player did not.

This repo already refuses to let the screen know more than the player — the suspects'
pigments are matched in value and chroma so the board never suspects anyone first. The
deadline was the one place breaking that rule.

Discovery time is public and always drawn solid. The estimate is drawn by how it was
come by:

	mark
確定 — examination or physical evidence	solid, the time as it is
範囲 — "somewhere between"	a span with returns at both ends
不明 — nothing yet	dotted across the known width, ? in place of a time
第三者の推定 — someone says so	dotted, ? beside the time, and whose word it is, in their ink

Splitting the first from the last is the point. The same 18:50 means one thing when the
detective established it and another when a bystander asserts it — and if that bystander
is the culprit, the two stop agreeing the moment the examination lands. That is the
existing clash line's trick, applied to the deadline.

Nothing is filled. The window is a line with returns at each end; a shaded band would
compete with the suspects' own bars.

mocks/desktop/deadline-states.html puts the four side by side, because switching
#death= shows each but never lets you compare them — and comparing is the point. The
marks come from Mock.deathMarks, the same call the alibi table makes, so the sheet
cannot drift from what the screens draw.

2. The desk can reach a place

The phone lists places in its swap nav. The desk had no way in at all: switching there is
done by the alibi table's column headings, and places hold no column. The mock said so,
with a 「まだ」 in it — a note left for later rather than a decision.

The consequence was that the same case played differently by device. On a phone you step
from the counter to the back room where you stand; on a desk you go back to the prep
screen first.

The desk now has its own way in, beside the nameplate rather than in the table. Grey, no
pigment — places do not answer, and the colours belong to those who do. The place you are
already looking at is left out, since an entry that does nothing when pressed is worse
than no entry.

Not here

• The phone chart still draws the old single deadline line.
• App-side work: AlibiChart takes one { at, label }; the disclosure flag on evidence
  in scenario-definition.ts; the screens still feed estimatedDeathAt from turn one;
  and places never reaches the real screens at all (ScenarioDetail has no such field,
  so only Storybook passes them). Sketched at the end of docs/design/deadline-window.md.

Test plan

• bun run lint — no errors
• all four deadline states rendered and read at 1440×900 (screenshots/death/)
• desk place switch checked from both a person (帳場 / 奥の間 offered) and a place
  (only 奥の間 offered)
• reviewer: 18:50 and 19:10 are twenty minutes apart here and the labels clear each
  other; Tsukimisou's 20:15/20:30 is fifteen, which is the tighter case to check once
  this reaches the app