Modernize connection management dialogs

[bifrost0x]

Summary

• align the saved connection editor with the Quick Connect card hierarchy
• keep profile actions visible while only the form content scrolls
• modernize Jump Hosts, SSH Keys, and Settings with responsive manager cards
• replace modal close spans with keyboard-focusable buttons across workspace, SFTP, and admin dialogs
• add focused desktop, mobile, scrolling, and accessibility browser coverage

Validation

• 4 focused Playwright UI tests
• 169 JavaScript unit tests
• 38 targeted template contract tests
• JavaScript lint
• vendored asset integrity check
• Docker image build and visual verification on the local preview

[chatgpt-codex-connector]

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