feat: themes (#113)

* feat: themes

* feat: flexoki theme

* feat: onedark theme

* feat: monokai pro theme

* feat: opencode theme (default)

* feat: dracula theme

* feat: tokyonight theme

* feat: tron theme

* some small fixes

---------

Co-authored-by: Kujtim Hoxha <kujtimii.h@gmail.com>

internal/app/app.go

@@ -16,6 +16,7 @@ import (
 	"github.com/opencode-ai/opencode/internal/message"
 	"github.com/opencode-ai/opencode/internal/permission"
 	"github.com/opencode-ai/opencode/internal/session"
+	"github.com/opencode-ai/opencode/internal/tui/theme"
 )
 
 type App struct {
@@ -49,6 +50,9 @@ func New(ctx context.Context, conn *sql.DB) (*App, error) {
 		LSPClients:  make(map[string]*lsp.Client),
 	}
 
+	// Initialize theme based on configuration
+	app.initTheme()
+
 	// Initialize LSP clients in the background
 	go app.initLSPClients(ctx)
 
@@ -73,6 +77,21 @@ func New(ctx context.Context, conn *sql.DB) (*App, error) {
 	return app, nil
 }
 
+// initTheme sets the application theme based on the configuration
+func (app *App) initTheme() {
+	cfg := config.Get()
+	if cfg == nil || cfg.TUI.Theme == "" {
+		return // Use default theme
+	}
+
+	// Try to set the theme from config
+	err := theme.SetTheme(cfg.TUI.Theme)
+	if err != nil {
+		logging.Warn("Failed to set theme from config, using default theme", "theme", cfg.TUI.Theme, "error", err)
+	} else {
+		logging.Debug("Set theme from config", "theme", cfg.TUI.Theme)
+	}
+}
 
 // Shutdown performs a clean shutdown of the application
 func (app *App) Shutdown() {