AI retro templates

[ellgreen]

Add the ability to generate retro columns using AI. Currently supporting OpenAI but should be easy to add further models using langchain.

[Copilot]

Pull request overview

This PR introduces AI-powered retrospective template generation using OpenAI via the langchain library. Users with AI enabled can generate creative, theme-based retro column structures by entering a simple prompt (e.g., "star wars"). The feature is conditionally displayed based on the ai_enabled flag returned from the backend, which checks if an OpenAI API key is configured.

Key Changes:

• Added OpenAI integration through langchain with a custom prompt for generating themed retro columns
• Created new UI components (Spinner, InputGroup) and an AI template popover interface
• Extended user authentication to track and sync AI availability status via localStorage and API

Reviewed changes

Copilot reviewed 22 out of 23 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
go.mod / go.sum	Added langchain dependency for AI model integration; updated Go version references
cmd/thoughts/config.go	Added OpenAIAPIKey configuration field
cmd/thoughts/main.go	Integrated AI model resolution into application initialization
cmd/thoughts/routes.go	Added /api/ai/retro-template endpoint for AI template generation
cmd/thoughts/resources/user.go	Extended User resource to include ai_enabled field based on AI availability
cmd/thoughts/controllers/ai.go	New controller handling AI retro template requests with validation
cmd/thoughts/ai/provider.go	AI model provider resolution with fallback when no API key configured
cmd/thoughts/ai/models.go	OpenAI model initialization using gpt-4o-mini
cmd/thoughts/ai/prompts/retro_template.go	Comprehensive system prompt for generating themed retro templates
cmd/thoughts/ai/prompts/json.go	JSON parsing utility for AI responses
ui/src/types.ts	Added ai_enabled to User interface and AIRetroTemplateResponse interface
ui/src/hooks/use-auth.ts	Extended localStorage handling for AI enablement flag
ui/src/components/auth.tsx	Added API call to sync user data including AI availability on mount
ui/src/components/retro/creator.tsx	Integrated AI template button conditionally based on user's AI enablement
ui/src/components/retro/ai-retro-template.tsx	New component providing AI template generation popover with form validation
ui/src/components/ui/spinner.tsx	New reusable loading spinner component
ui/src/components/ui/input-group.tsx	New compound input component supporting addons and buttons
ui/src/components/ui/input.tsx	Removed flex class for better compatibility with input groups
ui/src/components/ui/button.tsx	Added icon-sm and icon-lg size variants; removed shadow-xs from default/secondary variants
ui/src/components/retro/note-dialog.tsx	Added autoComplete="off" to input field
ui/src/components/error.tsx	Added min-w-md class to error cards
README.md	Added documentation for AI feature configuration

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