feat: Implement step persistence in wizard component

[micanipho]

This pull request adds support for persisting the current step in the wizard component, allowing users to stay on the same step after a page refresh (on a per-browser-tab basis). Step persistence is opt-in via a new persistCurrentStep flag, which is enabled by default for new and existing wizards. The implementation is careful to avoid persisting steps in the form designer and inside modals. The logic for step selection and persistence is refactored into a new utility module for easier testing and code clarity.

Wizard step persistence:

• Added a new persistCurrentStep boolean property to IWizardComponentProps, with UI support in the settings form and defaulting to true for new and existing wizards. [1] [2] [3] [4]
• The wizard now persists the current step index to session storage when persistCurrentStep is enabled, restoring it after a page refresh. Persistence is disabled in the designer and in modals to avoid context issues. [1] [2]
• When the wizard is completed, the persisted step is cleared so a later visit starts fresh.

Step selection logic refactoring:

• Extracted step index resolution and persistence logic into a new pure utility module stepSelection.ts, including helpers like getDefaultStepIndex, getInitialStepIndex, isValidStepIndex, and shouldPersistStep. [1] [2] [3]
• Updated wizard navigation to use the new helpers, ensuring consistent and testable step selection and persistence behavior. [1] [2]

Related to issue (#4574)

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Reviewing files that changed from the base of the PR and between d13f4de and 8627b8c.

📒 Files selected for processing (5)

• shesha-reactjs/src/designer-components/wizard/hooks.ts
• shesha-reactjs/src/designer-components/wizard/index.tsx
• shesha-reactjs/src/designer-components/wizard/models.ts
• shesha-reactjs/src/designer-components/wizard/settingsForm.ts
• shesha-reactjs/src/designer-components/wizard/stepSelection.ts

👮 Files not reviewed due to content moderation or server errors (5)

• shesha-reactjs/src/designer-components/wizard/hooks.ts
• shesha-reactjs/src/designer-components/wizard/models.ts
• shesha-reactjs/src/designer-components/wizard/stepSelection.ts
• shesha-reactjs/src/designer-components/wizard/index.tsx
• shesha-reactjs/src/designer-components/wizard/settingsForm.ts

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