feat(ui): add-question configure step; insert after the current row; scroll to and highlight the new row (#17)

[PrjShrestha]

Closes #17 (T9d). Parent epic #9. Plan: docs/plans/9_complex_logic_calculation_relevant_constraint/README.md (on the T9 docs branch). Independent of #23 / #24 / #25; branched from master.

What

Configure step. After a question tile (or a select's choices step), the picker shows one more step before committing: required, a hint per visible language, and a Validation slot (constraint expression with the existing "✎ build" modal, plus a constraint_message per language). 9e replaces the slot with presets. Enter anywhere commits. "add without details" is the one-click behaviour for that question; "Always skip this step" remembers it. Structural tiles, the lineage sentinel, hidden rows and edit-type reopens never get the step. The row is written with required = yes, hint::<loc>, constraint and constraint_message::<loc> only for the values the author set, so an untouched step adds exactly the row the one-click flow added.

Insert after the current row. "+ Question" lands directly after the row the author is on (the last focused card), via a new shared insertIndexAfterRow (node-tested). A begin-group row counts as "inside the group"; any other row is followed by its new sibling, so every pair stays balanced. With no current row it falls back to the existing defaultInsertIndex.

Scroll and highlight. After commit the new row is scrolled into view, focused and flashed for 2.5 s; a row that Simple mode would hide flips the editor to Full first.

The Validation slot builds against the same dependency-ordered, unique-name, non-plumbing field list the row card uses, now one function (pickableFieldsBefore), computed for the insert position.

Tests

• surveyEdits.insertAfter.test.ts: after a top-level row, after a row inside a group, after a begin row, trailing-plumbing fallback, unknown id; each asserts structural balance of the spliced survey.
• add-question-configure.spec.ts (Playwright): add age (integer) with required, hint, a constraint and a message while on lmp_date; it lands right after, flashed and in view; the sheet has those cells and every other row's cells are unchanged. "add without details" adds the plain row. A question added while on a row inside a group lands inside, right after it, balanced, and saves. The remembered preference commits on the tile click.

Suite note. Thirteen build specs click tiles expecting an immediate commit. Rather than rewrite forty-odd call sites, the Playwright profile seeds the "always skip" preference ON (storageState in playwright.config.ts, which also covers the specs that bypass setup.ts); the new spec clears it to drive the step. demo.spec.ts's row-order expectations now reflect insert-after-current-row (that spec already fails later on master, see below).

Validate

Check	Result
pnpm typecheck	clean
pnpm lint	fails on master already (164 problems in untouched files); the new files lint clean, the touched legacy files add no new problems
pnpm --filter @cht-ui/shared build && test	827 pass, 0 fail (5 new)
Playwright add-question-configure, form-editing, condition-builder, pick-preexisting-values, form-data-passing, demo, geriatric-build	42 pass, 4 fail: demo 1 & 4 ("add inside", "+ Type") and geriatric-build lines 468 & 492, all four failing identically on a clean master
node scripts/corpus-sweep.mjs	output byte-identical to master

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