chore: adjust database custom prompt ui

[richardshiue]

Feature Preview

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PR Checklist

• My code adheres to AppFlowy's Conventions
• I've listed at least one issue that this PR fixes in the description above.
• I've added a test(s) to validate changes in this PR, or this PR only contains semantic changes.
• All existing tests are passing.

Summary by Sourcery

Refactor and improve the custom prompt database selector UI in the AI prompt modal, enhancing user experience and adding more flexible database selection functionality.

Bug Fixes:

• Fixed issues with database prompt selection and loading
• Improved error handling for invalid database selections

Enhancements:

• Redesigned the database selector component to be more flexible and user-friendly
• Improved the UI for selecting and displaying custom database prompts
• Added an onboarding state for when no database is selected

Chores:

• Refactored database selector and prompt selection components
• Updated dialog and UI styling to be more consistent

[sourcery-ai]

Reviewer's Guide

This pull request refines the user interface for selecting a database for custom AI prompts. It achieves this by introducing a new onboarding flow using the AiPromptOnboarding widget when no database is initially selected in the custom prompts section. The CustomPromptDatabaseSelector widget has been refactored with a childBuilder to allow its button's appearance to be context-dependent (e.g., a prominent "Select Database" button for onboarding versus a subtle "Change" button). State management in AiPromptSelectorCubit was adjusted to support these UI changes, particularly for handling empty custom prompt lists, now relying on the UI to display states like "no results" or the onboarding screen. Error handling for invalid databases now uses an updated dialog style, and a backend change prevents empty content from being treated as a valid prompt.

File-Level Changes

Change	Details	Files
Introduced Custom Prompt Onboarding UI	Added AiPromptOnboarding widget to guide users in selecting a database for custom prompts. Modified AiPromptModal to display the onboarding UI when the custom section is active and no database is selected.	frontend/appflowy_flutter/lib/ai/widgets/ai_prompt_modal/ai_prompt_modal.dart frontend/appflowy_flutter/lib/ai/widgets/ai_prompt_modal/ai_prompt_onboarding.dart frontend/appflowy_flutter/lib/ai/widgets/ai_prompt_modal/ai_prompt_database_selector.dart
Enhanced Database Selector Widget and UI	Refactored CustomPromptDatabaseSelector to use a childBuilder for its trigger, allowing for dynamic button styles. Introduced AiPromptDatabaseSelectorButton as the new default button, displaying database name and a "Change" option. Enabled auto-focus on the search input within the database selection popover. Removed instructional text from the database selection popover header.	frontend/appflowy_flutter/lib/ai/widgets/ai_prompt_modal/ai_prompt_database_selector.dart frontend/appflowy_flutter/lib/ai/widgets/ai_prompt_modal/ai_prompt_visible_list.dart
Improved Handling of Custom Prompt States and Errors	Updated AiPromptSelectorCubit to prevent automatic switching to "featured" prompts if custom prompts are empty; UI now manages these states. Added a "No results" message in AiPromptVisibleList when no custom prompts are found. Revised error dialog for invalid database selection using the dialog_v2.dart component. Backend: Prevented database rows with empty content fields from being considered valid prompts.	frontend/appflowy_flutter/lib/ai/service/ai_prompt_selector_cubit.dart frontend/appflowy_flutter/lib/ai/widgets/ai_prompt_modal/ai_prompt_visible_list.dart frontend/appflowy_flutter/lib/ai/widgets/ai_prompt_modal/ai_prompt_modal.dart frontend/rust-lib/flowy-database2/src/services/database/database_editor.rs frontend/appflowy_flutter/lib/workspace/presentation/widgets/dialog_v2.dart
General UI Styling and Minor Adjustments	Applied a distinct background color to selected prompt items in the list. Standardized close icon and padding across dialogs. Removed unnecessary disabled state logic from the "Custom" prompt category button.	frontend/appflowy_flutter/lib/ai/widgets/ai_prompt_modal/ai_prompt_visible_list.dart frontend/appflowy_flutter/lib/workspace/presentation/widgets/dialog_v2.dart frontend/appflowy_flutter/lib/ai/widgets/ai_prompt_modal/ai_prompt_category_list.dart

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[github-actions]

🥷 Ninja i18n – 🛎️ Translations need to be updated

Project /project.inlang

lint rule	new reports	level	link
Missing translation	174	warning	contribute (via Fink 🐦)

[sourcery-ai]

Hey @richardshiue - I've reviewed your changes - here's some feedback:

• The AiPromptDatabaseSelectorButton now fetches ViewPB independently; consider if this data fetching should be managed by AiPromptSelectorCubit to centralize view-related state.
• Since the backend now skips generating prompts from rows with empty content, ensure the UI clearly communicates to the user if a selected database yields no custom prompts due to this filtering.
• The AiPromptSelectorCubit's behavior for selectDatabase has changed when custom prompts are empty (no longer defaulting to "Featured"); confirm this new user flow is intended.

Here's what I looked at during the review

• 🟡 General issues: 1 issue found
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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