Feedback view screen scaling

[twells46]

Fix #363 by making the Dialog component responsive to screen size.

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Note

Improves responsiveness and layout behavior for modal content.

• Dialog Container now uses responsive sizing (width: 90%, maxWidth: 800px, maxHeight: 90vh) and flex column layout
• Widget Container switches from flexBasis: 0 to flex: 1 with minHeight: 0 for proper flex behavior
• Adds Content wrapper inside Widget to make children scrollable (overflowY: auto, overflowX: hidden)

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Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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