Support grid layouts in the STACK flow component

[DonOmalVindula]

Purpose

The STACK flow component in @thunderid/react always renders its children as a flex row/column, so layouts like a 2 x 2 button grid (four login options, two per row) are impossible even though the EmbeddedFlowComponent.items property ("Number of items across the main axis (for Stack grid-like layouts)") already exists in @thunderid/javascript. This PR makes the renderer honor items.

Approach

• In AuthOptionFactory's Stack case, items is the number of slots across the main axis and direction picks that axis: row (default) makes it the column count (items: 2 with four buttons renders a 2 x 2 grid), and column makes it the row count with children flowing into further columns.
• Grid mode requires items >= 2. Stacks with a single slot or no items keep the existing flex layout unchanged, so flows authored before this change render exactly as before.
• items is parsed defensively from the SDK's string | number type: malformed values ("2invalid"), zero, and negatives fall back to flex, and the slot count is clamped so a mistyped value cannot render thousands of cells.
• These are the same semantics as the ThunderID flow builder canvas and the product Gate renderer, which share a getStackGridSx helper in the companion PR.

Related Issues

• Refs Unable to create a 2 x 2 button grid layout using Stack component thunderid#3703

Related PRs

• Companion Gate/renderer fix: Support grid layouts in the STACK flow element thunderid#4365

Checklist

• Followed the contribution guidelines.
• Manual test round performed and verified.
• Documentation provided. (Add links if there are any)
• Tests provided. (Add links if there are any)
  • Unit Tests
  • Integration Tests
• Breaking changes. (Fill if applicable)

Security checks

• Followed secure coding standards in WSO2 Secure Coding Guidelines
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets.

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• packages/react/src/components/presentation/auth/AuthOptionFactory.tsx
• packages/react/src/components/presentation/auth/__tests__/AuthOptionFactory.test.tsx

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