Feat: make progress stepper interactive for backward navigation

[lavanya1486]

Description

I have updated the progress stepper in the "File Case / FIR" page (FileUnifiedPage.jsx) to support backward navigation directly from the stepper UI.

Here are the interactive changes made:

• Clickable Completed Steps: Previous steps (step.number < currentStep) are now interactive and clickable.
• State Preservation: Clicking a previous step updates the active step to that point smoothly without losing the formData state.
• Visual Indicators: When hovering over a completed step, the cursor changes to a pointer and applies a subtle hover opacity effect to indicate it is interactive.

This ensures that users no longer have to solely rely on the "Previous" button for navigating backward and can jump back seamlessly.

Type of change

• New feature (non-breaking change which adds functionality)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Closes #667

[vercel]

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