project-switching

# Project Switching Switch between git repositories without restarting sidecar. Press `@` to open the project switcher modal. ## Architecture Overview The project switcher uses the app's declarative modal library (`internal/modal/`) for rendering and mouse handling. ### Key Files | File | Contents | |------|----------| | `internal/app/model.go` | State, init, reset, filter, switch, theme preview | | `internal/app/update.go` | Keyboard and mouse handlers | | `internal/app/view.go` | Modal building and section rendering | | `internal/modal/` | Modal library (builder, sections, layout) | | `internal/config/types.go` | ProjectConfig struct | | `internal/config/loader.go` | Config loading with path validation | ### Model State ```go // internal/app/model.go showProjectSwitcher bool projectSwitcherCursor int projectSwitcherScroll int projectSwitcherInput textinput.Model projectSwitcherFiltered []config.ProjectConfig projectSwitcherModal *modal.Modal // Cached modal instance projectSwitcherModalWidth int // Width for cache invalidation projectSwitcherMouseHandler *mouse.Handler ``` ## Project vs Worktree Switching - **Project Switching** (`@`): Switch between configured projects from `config.json` (arbitrary repos) - **Worktree Switching** (`W`): Switch between git worktrees within the current repository ## Configuration Projects are configured in `~/.config/sidecar/config.json`: ```json { "projects":...