[J2TeamNNL]

Summary

• The iOS table browser can show rows in a grid: one line per row, a header pinned to the top, columns that scroll sideways, and the first column kept in view while they scroll.
• A Cards / Grid picker sits in the browser's More menu. The choice is stored under com.TablePro.settings.rowLayout and applies to every table and window.
• Default until a choice is made: regular width (iPad) opens in the grid, compact width (iPhone) keeps the cards. A choice the user makes wins at every width.
• A tap on a grid row opens the same row detail view a card opens. The row context menu (share, copy, foreign keys) is the same. Swipe to delete does not exist outside a List, so the grid offers Delete Row in the context menu and as an accessibility action, under the same checks as the swipe.
• Column widths come from the header and the first 50 rows, between 72 and 320 points, and scale with Dynamic Type.
• Built from SwiftUI parts the app already uses: a two-axis ScrollView, a LazyVStack with a pinned section header, and onScrollGeometryChange to hold the first column in place. SwiftUI Table was not used: on iPhone it collapses to one column, and it does not scroll sideways.

Test plan

• RowLayoutTests: the width default, a stored choice winning at both widths, the choice read back through AppStorage from an isolated defaults suite, and an unknown stored value falling back to the default.
• RowGridMetricsTests: one width per column, the clamp, a longer value widening its column, NULL counting as its label, and only the first line of a value counting.
• verify.sh ios RowLayoutTests RowGridMetricsTests DuoLayoutResolverTests DataBrowserViewModelTests: PASS, 61 tests.
• verify.sh lint on every changed Swift file: PASS.
• Checked on the iPhone 17 Pro and iPad Pro 11-inch simulators, light and dark, with the Chinook sample: switching layouts, scrolling sideways and down, and opening a row from the grid.

Before, iPhone (cards, unchanged and still the iPhone default):

After, iPhone light: grid, scrolled sideways with the first column held, and the layout picker:

After, iPhone dark: grid, scrolled sideways, and the detail view a row opens:

After, iPad light, grid by default:

After, iPad dark, scrolled sideways:

Fixes #3933