macOS port: build, rendering, daemon, and mining fixes

Build & setup:
- Fix setup.sh and build.sh for macOS (bundle daemon, xmrig, sapling params, asmap.dat into .app)
- Fix CMakeLists.txt libsodium linking for macOS
- Fix incbin.h to use __DATA,__const section on macOS
- Remove vendored libsodium-1.0.18 source tree (use fetch script instead)
- Remove prebuilt-binaries/xmrig (replaced by xmrig-hac)
- Add .DS_Store to .gitignore

Rendering & UI:
- Use GLSL #version 150 and OpenGL 3.2 Core Profile on macOS
- Force dpiScale=1.0 on macOS to fix Retina double-scaling
- Set default window/UI opacity to 100% on Mac/Linux
- Add scroll fade shader guard for macOS GL compatibility
- Add ImGui error recovery around render loop and mining tab

Daemon & bootstrap:
- Fix getDragonXDataDir() to return ~/Library/Application Support/Hush/DRAGONX/ on macOS
- Fix isPortInUse() with connect() fallback (no /proc/net/tcp on macOS)
- Increase daemon watchdog timeout from 3s to 15s
- Add daemon status indicator (colored dot + label) in wizard bootstrap phases

Mining tab:
- Fix EmbeddedDaemon::getMemoryUsageMB() crash on macOS (was using Linux /proc)
- Fix XmrigManager::getMemoryUsageMB() to use ps on macOS instead of /proc
- Restructure RenderMiningTab with wrapper pattern for exception safety
- Fix default pool URL to include port (pool.dragonx.is:3433)

src/daemon/xmrig_manager.cpp

@@ -512,6 +512,21 @@ bool XmrigManager::isRunning() const {
 
 double XmrigManager::getMemoryUsageMB() const {
     if (process_pid_ <= 0) return 0.0;
+#ifdef __APPLE__
+    // macOS: use ps to read RSS for xmrig process
+    char cmd[128];
+    snprintf(cmd, sizeof(cmd), "ps -o rss= -p %d 2>/dev/null", process_pid_);
+    FILE* fp = popen(cmd, "r");
+    if (!fp) return 0.0;
+    char line[64];
+    double mb = 0.0;
+    if (fgets(line, sizeof(line), fp)) {
+        long rss_kb = atol(line);
+        if (rss_kb > 0) mb = static_cast<double>(rss_kb) / 1024.0;
+    }
+    pclose(fp);
+    return mb;
+#else
     char path[64];
     snprintf(path, sizeof(path), "/proc/%d/statm", process_pid_);
     FILE* fp = fopen(path, "r");
@@ -523,6 +538,7 @@ double XmrigManager::getMemoryUsageMB() const {
     fclose(fp);
     long pageSize = sysconf(_SC_PAGESIZE);
     return static_cast<double>(pages * pageSize) / (1024.0 * 1024.0);
+#endif
 }
 
 void XmrigManager::drainOutput() {