Fix connection modal height

[DhruvShah-Dev]

Summary

• Fixes [Bug]:Dialog box height changes based on amount of content in the dialog box. Might be a better user experience if we fix this dialog #462 by giving the New Connection modal a stable, viewport-bounded shell height.
• Keeps driver-specific form content scrolling inside the modal so switching between MySQL, PostgreSQL, and SQLite no longer resizes the whole dialog.
• Adds a focused regression test for the modal shell layout contract.

Validation

• pnpm.cmd test tests/components/modals/NewConnectionModal.test.tsx --run
• pnpm.cmd typecheck
• pnpm.cmd lint
• pnpm.cmd build
• git diff --check
• GitNexus impact and detect-changes: low risk, expected modal/test files only

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (2 files)

• src/components/modals/NewConnectionModal.tsx - 0 issues
• tests/components/modals/NewConnectionModal.test.tsx - 0 issues

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_{Reviewed by step-3.7-flash · Input: 76.5K · Output: 12.7K · Cached: 620.4K}

[debba]

Thanks a lot for this @DhruvShah-Dev! Heads up that a full restyling of the interface is coming soon, so some of this area will change, but this fix is a small and useful foundation to build on in the meantime.

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