update widgets, add copy paste buffer

src/platform/platform_win32.cpp

@@ -206,3 +206,51 @@ PlatformInputEvents platform_get_input_events(PlatformWindow *window) {
     window->input_events = {};
     return result;
 }
+
+void platform_clipboard_set(const char *text) {
+    if (!text) return;
+    int len = (int)strlen(text);
+    if (len == 0) return;
+
+    // Convert UTF-8 to wide string for Windows clipboard
+    int wlen = MultiByteToWideChar(CP_UTF8, 0, text, len, nullptr, 0);
+    if (wlen == 0) return;
+
+    HGLOBAL hmem = GlobalAlloc(GMEM_MOVEABLE, (wlen + 1) * sizeof(wchar_t));
+    if (!hmem) return;
+
+    wchar_t *wbuf = (wchar_t *)GlobalLock(hmem);
+    MultiByteToWideChar(CP_UTF8, 0, text, len, wbuf, wlen);
+    wbuf[wlen] = L'\0';
+    GlobalUnlock(hmem);
+
+    HWND hwnd = g_current_window ? g_current_window->hwnd : nullptr;
+    if (OpenClipboard(hwnd)) {
+        EmptyClipboard();
+        SetClipboardData(CF_UNICODETEXT, hmem);
+        CloseClipboard();
+    } else {
+        GlobalFree(hmem);
+    }
+}
+
+const char *platform_clipboard_get() {
+    static char buf[4096];
+    buf[0] = '\0';
+
+    HWND hwnd = g_current_window ? g_current_window->hwnd : nullptr;
+    if (!OpenClipboard(hwnd)) return nullptr;
+
+    HGLOBAL hmem = GetClipboardData(CF_UNICODETEXT);
+    if (hmem) {
+        wchar_t *wbuf = (wchar_t *)GlobalLock(hmem);
+        if (wbuf) {
+            int len = WideCharToMultiByte(CP_UTF8, 0, wbuf, -1, buf, sizeof(buf) - 1, nullptr, nullptr);
+            buf[len > 0 ? len - 1 : 0] = '\0'; // WideCharToMultiByte includes null in count
+            GlobalUnlock(hmem);
+        }
+    }
+
+    CloseClipboard();
+    return buf[0] ? buf : nullptr;
+}