Form and Section

[colemancda]

Fifth tier, second half: grouped forms. DatePicker remains deferred to its own tier.

What's new

• Form — a scrolling container of sections; the interpreter renders it as a vertically-scrolling column.
• Section — Section("Header"), Section(header:footer:), or unlabeled; rendered as an inset rounded group (surface variant) with an uppercase header, dividers between rows, and an optional footer.

Rows are ordinary views, so toggles, sliders, text fields, and stacks work inside a section unchanged.

Verification

• swift test — new test (Form nests a Section with its header and rows), 48 total passing
• Emulator (new Form screen): a settings-style form with CONNECTIVITY (two toggles), DISPLAY (slider + level row + footer), and ACCOUNT (text field + status row) sections — grouped surfaces, dividers, headers, and live controls all render correctly

Deferred

DatePicker (needs a date type + a Compose date dialog) — next tier. Section content here is string headers/footers; view-based headers are not modeled.