feat: improve saved connection workflows

[bifrost0x]

Summary

Implements the UI scope agreed in Discussion #59.

• launch complete saved connections directly without flashing the Quick Connect dialog
• fall back to review when passwords, SSH keys, jump hosts, or authorization require user input
• add inline SSH key upload and atomic key rename to saved connection management
• preserve editor state across key operations and provide keyboard-accessible controls
• use consistent Quick Connect and Saved Connections terminology across all six locales
• keep the workflow usable at 375 px with appropriate touch targets

Security and compatibility

• SSH key mutations remain scoped to the authenticated user on the server
• key rename changes metadata only and records atomic before/after audit values
• acknowledgements expose key summaries only, never private key content
• existing profile storage, Socket.IO event names, and CLI behavior remain compatible
• no database migration or dependency change is included

Validation

• Python 3.11: 1268 passed, 33 skipped
• Python 3.14: 1268 passed, 33 skipped
• JavaScript: 68 passed
• Playwright: 25 scenarios passed
• vendored assets verified
• Docker image build and application factory smoke test passed

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Preserve usability when merging key mutation replies

When an inline upload or rename succeeds, the acknowledgement contains stored key metadata without the transient usable field. Although the server emits a keys_list summary with usable: true before acknowledging, this replacement subsequently overwrites that summary and removes the flag. Since direct saved-connection launching requires usable === true, profiles using the uploaded or renamed key unexpectedly fall back to Quick Connect until keys are reloaded; merge the existing usability value or return a complete key summary.

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