initial commit 3??

src/components/ThemeProvider.tsx

@@ -0,0 +1,48 @@
+import { createSignal, createContext, useContext, createEffect, type ParentComponent } from "solid-js";
+
+type Theme = "dark" | "light" | "system";
+
+interface ThemeProviderState {
+    theme: () => Theme;
+    setTheme: (theme: Theme) => void;
+}
+
+const ThemeProviderContext = createContext<ThemeProviderState>();
+
+export const ThemeProvider: ParentComponent = (props) => {
+    const [theme, setTheme] = createSignal<Theme>("system");
+
+    // Load from local storage on mount
+    const storedTheme = localStorage.getItem("tasgrid-theme") as Theme | null;
+    if (storedTheme) {
+        setTheme(storedTheme);
+    }
+
+    createEffect(() => {
+        const root = window.document.documentElement;
+        root.classList.remove("light", "dark");
+
+        const currentTheme = theme();
+
+        if (currentTheme === "system") {
+            const systemTheme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "dark" : "light";
+            root.classList.add(systemTheme);
+        } else {
+            root.classList.add(currentTheme);
+        }
+
+        localStorage.setItem("tasgrid-theme", currentTheme);
+    });
+
+    return (
+        <ThemeProviderContext.Provider value={{ theme, setTheme }}>
+            {props.children}
+        </ThemeProviderContext.Provider>
+    );
+};
+
+export const useTheme = () => {
+    const context = useContext(ThemeProviderContext);
+    if (!context) throw new Error("useTheme must be used within a ThemeProvider");
+    return context;
+};