feat: Settings submenu (Settings.../About...), git column, projects tab

- main.cpp: registrar info About via fn_ui::about_window_set_info
- views.cpp: nueva columna "Git" en la tabla Apps (remote/local/-)
- data.h/cpp + data_http.cpp: AppRow gana repo_url + dir_path
- views.cpp: actions bar (Reindex / + Add / Reload / inbox) y modal Add
- views.cpp: tab Projects con tree + detalle anidado
- data_http.cpp: load_projects_http, load_project_detail_http, http_post_*
- http_client.cpp: SO_RCVTIMEO en Windows como DWORD ms (timeout 5 ms bug)
- CMakeLists: limpieza de srcs duplicados con fn_framework
- app.md: notas operativas y estado actual

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

http_client.cpp

@@ -8,15 +8,19 @@
 #ifdef _WIN32
 #include <winsock2.h>
 #include <ws2tcpip.h>
+#include <mutex>
 #pragma comment(lib, "ws2_32.lib")
 
+// std::call_once para evitar race condition si hay peticiones simultaneas
+// desde multiples threads (main + runners).
+static std::once_flag g_wsa_once;
+static bool g_wsa_ok = false;
 static bool wsa_init() {
-    static bool done = false;
-    if (!done) {
+    std::call_once(g_wsa_once, []() {
         WSADATA wsa;
-        done = (WSAStartup(MAKEWORD(2, 2), &wsa) == 0);
-    }
-    return done;
+        g_wsa_ok = (WSAStartup(MAKEWORD(2, 2), &wsa) == 0);
+    });
+    return g_wsa_ok;
 }
 typedef SOCKET sock_t;
 #define SOCK_INVALID INVALID_SOCKET
@@ -64,12 +68,19 @@ HttpResponse HttpClient::request(const std::string& method, const std::string& p
         return resp;
     }
 
-    // Set timeout
+    // Timeout — Windows y POSIX usan formatos distintos para SO_{RCV,SND}TIMEO.
+    // Windows: DWORD milisegundos. POSIX: struct timeval.
+#ifdef _WIN32
+    DWORD timeout_ms = static_cast<DWORD>(timeout_sec_ * 1000);
+    setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, (const char*)&timeout_ms, sizeof(timeout_ms));
+    setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, (const char*)&timeout_ms, sizeof(timeout_ms));
+#else
     struct timeval tv;
     tv.tv_sec = timeout_sec_;
     tv.tv_usec = 0;
     setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, (const char*)&tv, sizeof(tv));
     setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, (const char*)&tv, sizeof(tv));
+#endif
 
     // Connect
     struct sockaddr_in addr;
@@ -79,7 +90,14 @@ HttpResponse HttpClient::request(const std::string& method, const std::string& p
     addr.sin_addr.s_addr = inet_addr(host_.c_str());
 
     if (connect(sock, (struct sockaddr*)&addr, sizeof(addr)) != 0) {
+        int err = SOCK_ERR;
         SOCK_CLOSE(sock);
+        // Reportamos el errno/WSAError en el body para que el toast sea util.
+        char buf[128];
+        std::snprintf(buf, sizeof(buf),
+            "connect() failed to %s:%d (err=%d)",
+            host_.c_str(), port_, err);
+        resp.body = buf;
         return resp;
     }