Mobile had no support for the `collapsible` dialog element: a dialog
using one rendered none of its fields, because the container itself
carries no value and every lookup walked only the top level.
Conversion gains `flattenCollapsible` / `flattenDialogElements` /
`flattenAppFields`, named to match the webapp's helpers. Every path that
resolves a value by field name — submission, `collectFileIds`,
`mergeFileFieldValues`, refresh-source detection, dynamic-select lookup
in the dialog router, and `initValues` — now walks the flattened list, so
a nested field behaves exactly like a top-level one.
`CollapsibleSection` renders the chevron and title. Children unmount
while collapsed; their values live in the form's reducer, so nothing
typed is lost by closing a section, and a value typed into a section
that is then collapsed still submits.
Tested with 199 unit tests. The most complete of them,
dialog_router_collapsible.test.tsx, drives the real payload from the
demo plugin's `/dialog collapsible` sample through the real adapter,
conversion, form and input components, mocking only the network, and
asserts what the server receives on submit.
E2E coverage is added to the existing demo-plugin suite, against the
`/dialog collapsible` sample already present in the pinned demo plugin
release: each section's initial expanded state, opening a nested
section, a value surviving its section being collapsed, and a nested
value surviving a collapse round trip.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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