fix(tui): probe palette only for system theme

packages/tui/src/context/theme.tsx

@@ -159,7 +159,9 @@ const themeContext = createSimpleContext({
 
     createEffect(() => {
       const theme = config.theme?.name
-      if (theme) setStore("active", theme)
+      if (!theme) return
+      setStore("active", theme)
+      if (theme === "system") refreshPalette()
     })
 
     createEffect(() => {
@@ -204,6 +206,7 @@ const themeContext = createSimpleContext({
     let queued = false
     let disposed = false
     function refreshPalette() {
+      if (store.active !== "system") return
       queued = true
       if (!canProbe || probing || disposed) return
 
@@ -347,6 +350,7 @@ const themeContext = createSimpleContext({
       set(theme: string) {
         if (!hasTheme(theme)) return false
         setStore("active", theme)
+        if (theme === "system") refreshPalette()
         void configState
           .update((draft) => {
             draft.theme = { ...draft.theme, name: theme }

packages/tui/src/theme/index.ts

@@ -15,17 +15,16 @@ const listeners = new Set<(themes: Record<string, ThemeDocumentSource>) => void>
 const parsed = new WeakMap<object, ThemeDocument>()
 const decodeThemeDocument = Schema.decodeUnknownSync(ThemeDocument, { reportInput: true })
 
-function listThemes() {
+function listThemes(): Record<string, ThemeDocumentSource> {
   // Priority: defaults < plugin installs < custom files < generated system.
   const themes: Record<string, ThemeDocumentSource> = {
     ...DEFAULT_THEMES,
     ...pluginThemes,
     ...customThemes,
   }
-  if (!systemTheme) return themes
   return {
     ...themes,
-    system: systemTheme,
+    system: systemTheme ?? themes.system ?? themes.opencode,
   }
 }