feat(tui): add NvChadTheme field and ThemeByID helper

internal/tui/state.go

@@ -7,21 +7,33 @@ import (
 	"github.com/MDietermann/ArduinoArchSetup/internal/module"
 )
 
-// Theme is a named colorscheme presented in the wizard. Plan 3 wires these
-// names to actual theme modules; for now they are display-only strings.
+// Theme is a named colorscheme presented in the wizard. Each entry carries
+// per-tool theme names; Plan 3b uses NvChadTheme, later plans add more.
 type Theme struct {
-	ID   string
-	Name string
+	ID          string
+	Name        string
+	NvChadTheme string
 }
 
 // BuiltinThemes is the fixed list the wizard shows. Keep in sync with the
 // themes shipped by Plan 3's theme module.
 var BuiltinThemes = []Theme{
-	{ID: "gruvbox", Name: "Gruvbox Dark"},
-	{ID: "catppuccin", Name: "Catppuccin Mocha"},
-	{ID: "tokyonight", Name: "Tokyo Night"},
-	{ID: "nord", Name: "Nord"},
-	{ID: "dracula", Name: "Dracula"},
+	{ID: "gruvbox", Name: "Gruvbox Dark", NvChadTheme: "gruvbox"},
+	{ID: "catppuccin", Name: "Catppuccin Mocha", NvChadTheme: "catppuccin"},
+	{ID: "tokyonight", Name: "Tokyo Night", NvChadTheme: "tokyonight"},
+	{ID: "nord", Name: "Nord", NvChadTheme: "nord"},
+	{ID: "dracula", Name: "Dracula", NvChadTheme: "dracula"},
+}
+
+// ThemeByID returns the Theme with the given ID. The bool is false when no
+// match is found; callers decide whether to fall back or error.
+func ThemeByID(themes []Theme, id string) (Theme, bool) {
+	for _, t := range themes {
+		if t.ID == id {
+			return t, true
+		}
+	}
+	return Theme{}, false
 }
 
 // ModuleChoice is one row in the module selector.