fix(webui): keep account dialog content scrollable

[1zzxy1]

Summary

• keep the account dialog content scrollable on smaller windows
• prevent the confirm-password and action area from being pushed out of view during forced first-login password changes
• limit the fix to dialog layout only without changing account edit validation logic

Fixes #6628

Testing

• git diff --check
• frontend build/lint not run locally in this environment (dashboard dependencies/pnpm unavailable)

Summary by Sourcery

Ensure the account dialog layout remains scrollable and usable on smaller viewports without altering validation behavior.

Enhancements:

• Constrain the account dialog card height and layout to fit within the viewport while keeping critical actions visible.
• Make the account dialog content area independently scrollable to prevent form fields and buttons from being pushed out of view on small screens.

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the user experience of the account dialog by addressing responsiveness issues. It ensures that the dialog's content remains fully accessible and scrollable, particularly on smaller screens and during specific password change workflows, without impacting existing validation logic.

Highlights

• Responsive UI: The account dialog content now remains scrollable on smaller windows, improving usability on various screen sizes.
• User Experience: The confirm-password and action areas are prevented from being pushed out of view during forced first-login password changes, ensuring critical elements are always accessible.
• Scope Limitation: The fix is strictly limited to the dialog's layout and does not alter any account edit validation logic.

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[sourcery-ai]

Hey - I've left some high level feedback:

• Consider adding flex: 1 1 auto (or at least flex: 1) to .account-dialog__content so the scrollable area reliably takes up the remaining space inside the flex .account-dialog card, preventing layout issues if additional sections (e.g., actions/footer) are added.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider adding `flex: 1 1 auto` (or at least `flex: 1`) to `.account-dialog__content` so the scrollable area reliably takes up the remaining space inside the flex `.account-dialog` card, preventing layout issues if additional sections (e.g., actions/footer) are added.

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[gemini-code-assist]

Code Review

This pull request refactors the account dialog's styling in VerticalHeader.vue to manage its maximum height and enable vertical scrolling for its content. The feedback suggests improving maintainability by replacing the hardcoded 760px max-height value with a CSS variable or design token.

[gemini-code-assist]

The 760px value used for max-height is a magic number. For better maintainability and consistency, consider defining such fixed dimensions as CSS variables or design tokens, especially if this value is part of a broader design system or might be reused. This makes it easier to manage and update UI dimensions centrally.