ADFA-5018 | Open Agent settings from IDE Preferences

[jatezzz]

Description

What:

Migrated the AI Agent's settings from a floating chat dialog to a full-screen view accessible directly from the IDE's Preferences, while retaining the existing in-chat shortcut.

How:

• Implemented SettingsExtension in AiAssistantPlugin.kt to inject the Agent settings row under Preferences → Configuration → Agent.
• Converted AiSettingsFragment from a DialogFragment to a standard Fragment so it can be mounted full-screen by the host's PluginScreenActivity.
• Updated ChatFragment.kt to launch the settings via IdeUIService.openPluginScreen() instead of displaying a local dialog fragment.
• Updated UI layouts (fragment_ai_settings.xml) to match standard Preferences styling, including theme-aware backgrounds and a back arrow replacing the close button.
• Extracted hardcoded layout strings to strings.xml for proper localization and updated documentation references.

Why:

To make AI configuration discoverable for users configuring the IDE before opening a project, removing a dead end when the agent fails due to missing keys, and unifying the settings UI into a single, consistent implementation.

Details

• UI Changes: The settings screen now uses standard IDE header colors, a back arrow (ic_arrow_back.xml), and standard title placement. It fully respects the IDE's light and dark themes via PluginFragmentHelper.

• Logic Changes: The back button now finishes the host activity instead of dismissing a dialog. Lifecycle management in ChatFragment now relies on the standard onResume() callback rather than custom fragment result listeners to refresh backend availability.

document_5159000787652708101.mp4

Ticket

ADFA-5018

[claude]

Claude Code Review

This repository is configured for manual code reviews. Comment @claude review for a one-time review, or @claude review always to subscribe this PR to a review on every future push.

_{Tip: disable this comment in your organization's Code Review settings.}

[hal-eisen-adfa]

Do we have to finish ADFA-5017 before we proceed here?

[jatezzz]

@hal-eisen-adfa Yes, ADFA-5017 includes the API extension for this feature