Standardize create-flow option steps on one question-and-options layout and Selection sizes.

Method cards, chips, and the right rail now share the two-column shell; last options clear the footer fade, See all stays under the stack, and the left heading no longer jumps when the list expands.

Co-authored-by: Cursor <cursoragent@cursor.com>

.cursor/rules/create-flow.mdc

@@ -15,7 +15,9 @@ alwaysApply: false
 - Step id ↔ layout kind mapping is declared in
   `app/(app)/create/utils/createFlowScreenRegistry.ts`. Never branch on layout kind
   inside a screen — pick the matching shell (`CreateFlowStepShell` /
-  `CreateFlowTwoColumnSelectShell`).
+  `CreateFlowTwoColumnSelectShell`). Question-and-options steps (select, card,
+  right-rail) all use `CreateFlowTwoColumnSelectShell` plus `Selection` size
+  variants (`s` chip / `m` tile / `l` row).
 - Keep create-flow step routing centralized in
   `app/(app)/create/utils/createFlowPaths.ts` (`createFlowStepPath`,
   `CREATE_ROUTES`) — do not introduce new hardcoded `/create/...` literals.