Improve form accessibility and constraints

[google-labs-jules]

🎨 Palette: Improved accessibility and usability for form inputs

💡 What:

• Added aria-describedby to the "Connection Count" input to link it with its existing helper text.
• Added explicit min="0" and max="21" constraints to the "Vector ID (Last Flag)" input.
• Added a new helper text span for "Vector ID" explaining the range constraint and linked it via aria-describedby.

🎯 Why:

• Screen reader users were missing context provided by visual helper text.
• The "Vector ID" field had strict backend constraints (0-21) but no frontend validation or guidance, leading to potential errors.

♿ Accessibility:

• Programmatic association of helper text ensures screen readers announce descriptions when inputs are focused.
• Explicit constraints prevent invalid data entry.

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PR created automatically by Jules for task 6149954811307048846 started by @SudoAnirudh

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