This adds support for inserting newlines in the chat editor using
`shift+enter` (when supported) and `ctrl+j`. This allows users to write
multi-line messages more easily, enhancing the chat experience.

fix: increase padding in quit dialog

- Use tea.WithMouseCellMotion instead of WithMouseAllMotion to reduce event flooding
- Add MouseEventFilter to filter mouse wheel/motion events when editor is focused
- Implement debounced completion filtering (150ms) to reduce overhead during fast typing
- Add proper timer cleanup when editor loses focus
- Remove unnecessary ChatFocusedMsg handling since filter checks focus state directly

This eliminates typing lag caused by mouse scroll events while maintaining mouse functionality for navigation.

- allow users to setup custom providers without api keys for local
providers
- use the name of the provider in the model list

- Document Splash interface methods for clarity
- Add comments explaining state initialization logic
- Clarify when splash goes full screen vs shared layout
- Focus on explaining 'why' without over-documenting 'what'

- Add layout constants for borders, padding, and positioning
- Add timing constant for cancel timer duration
- Improve code readability and maintainability
- Make layout calculations self-documenting

- Add panic recovery with graceful TUI shutdown to app.Subscribe method
- Ensures application doesn't crash if TUI subscription loop panics
- Logs panic details to timestamped files for debugging
- Maintains consistency with other critical goroutines in codebase

fix: shifting LSPs and MCPs in sidebar

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Configuration tests  and new logging

Signed-off-by: Carlos Alexandro Becker <caarlos0@users.noreply.github.com>

chore: small fixes

chore: small fixes