Add additional questions and other improvements to the feedback flow

[m-mohr]

• Update requests according to new OpenAPI file
• Add a modal that is shown after rating submission, allowing users to select qualitative observations via checkboxes (options vary by rating)
• Move "Tell Us More" button from the feedback widget into the tags modal
• Replace disabled submit buttons with always-active buttons; inline validation errors appear after the first submit attempt (fields, checkboxes, and personal details)
• Contribute button is always visible regardless of zoom level
• Contribute button is centered when shown alone; left-aligned when paired with a Submit button
• Zoom gate message renders "all" in bold via template markup instead of a plain computed string, generally making the messages more concise

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Pull request overview

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