feature: add inline cursor navigation

[spinualexandru]

recording_2025-09-19_15-19-17.mp4

Brief description of what this PR does

• Allows moving the text cursor with left and right arrows so you can modify the input
• Move inline hooks to hooks so they can be easily reused across components and also make them more maintainable
• Added UIStateContext for shared state instead of local state
• Reduced text input complexity
• Addressed separation of concerns ( input state vs ui state )
• Improved line counting by adding a debounce and cache to prevent ui blocking
• Proper cleanup to prevent memory leaks with cleanup effects

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update

Testing

• Tested with Ollama
• Tested with OpenRouter
• Tested with OpenAI-compatible API
• Tested MCP integration (if applicable)

Checklist

• Code follows project style guidelines
• Self-review completed
• Documentation updated (if needed)
• No breaking changes (or clearly documented)

[Copilot]

Pull Request Overview

This PR adds inline cursor navigation functionality to the text input component and refactors code organization. It introduces a new TextInput component from ink-text-input for better cursor handling and reorganizes existing hooks into separate modules for improved maintainability.

• Adds cursor navigation with left/right arrows using ink-text-input
• Extracts inline hooks to dedicated hook modules (useUIState, useInputState)
• Adds UIStateContext for shared state management across components

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
source/hooks/useUIState.ts	New hook for managing UI state with context provider
source/hooks/useInputState.ts	New hook for managing input state with debounced line counting
source/components/user-input.tsx	Refactored to use extracted hooks and TextInput component
source/app.tsx	Added UIStateProvider wrapper and formatting updates
package.json	Added ink-text-input dependency and types

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