[yashinrush]

Summary of Changes:

Fixes an issue where submitting without input triggered an infinite loading state that froze the UI, and adds proper input validation and user feedback.

• Defensive Validation: Checks text.trim() and docUrl.trim() before triggering loading state; shows user-friendly error notification if both are missing.
• Prevent Infinite Loading: Wraps submission handling in try ... finally blocks to ensure setLoading(false) is always reached.
• Question Counter Limits: Prevents numQuestions from decrementing below 1.
• Clipboard Integration: Connects the clipboard icon button in textarea to navigator.clipboard.readText().
• Error Feedback: Added an inline dismissible error banner for validation and backend communication errors.

Addressed Issues:

Fixes #608

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• This PR contains AI-generated code. I have read the AI Usage Policy and this PR complies with this policy. I have tested the code locally and I am responsible for it.

I have used the following AI models and tools: Google Gemini (Antigravity)

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• My PR addresses a single issue, fixes a single bug or makes a single improvement.
• My code follows the project's code style and conventions
• My changes generate no new warnings or errors
• I have joined the Discord server and I will share a link to this PR with the project maintainers there
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