fix(ui): made the interview exp preview scrollable

[Master-Bruce-Wayne]

This PR fixes a UI layout issue in the Interview Experiences "Add/Edit" form (PostExperience.jsx) where long, unbroken text in the Markdown Preview box would overflow the container, causing layout overlaps and pushing the "Submit" button out of place.

Changes made:

• Scrollable Preview: Added overflow-hidden to the outer preview container and overflow-y-auto to the inner content to strictly enforce the height limits and enable vertical scrolling.
• Word Wrapping: Changed the word wrap property from break-words to break-all to ensure continuous long strings without spaces don't break out horizontally or vertically.
• Height Alignment: Fixed the preview container's height to 150px to perfectly match the adjacent Textarea.
• Flex Alignment: Adjusted the flex alignment to items-start with a gap-4 to improve the spacing and top-alignment of the text area and the preview box.

Screenshot:

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