fix(integrations): enhance combobox to support custom values

[Marfuen]

What does this PR do?

• Fixes #XXXX (GitHub issue number)
• Fixes COMP-XXXX (Linear issue number - should be visible at the bottom of the GitHub issue description)

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PR Summary

• Combobox enhancements: ConnectIntegrationDialog and ManageIntegrationDialog now support custom values in combobox fields by synthesizing a selectedItem when the current value isn’t in options and wiring onCreate to persist typed values.
• AWS regions: Expanded awsCredentialFields region combobox options to a broader, categorized list of AWS regions.

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Project	Deployment	Review	Updated (UTC)
app	Building	Preview, Comment	Jan 5, 2026 2:50pm

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Project	Deployment	Review	Updated (UTC)
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[claudfuen]

🎉 This PR is included in version 1.72.2 🎉

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[graphite-app]

Graphite Automations

"Auto-assign PRs to Author" took an action on this PR • (01/05/26)

1 assignee was added to this PR based on Mariano Fuentes's automation.