feat: implement file watching functionality in the filesystem module

- Added methods for file watching, including `watch`, `unwatch`, `unwatchAll`, `getWatchCount`, `pollWatch`, `getLastWatchPath`, and `getLastWatchRealPath`.
- Enhanced the `Filesystem` class to support monitoring file changes, allowing for real-time updates.
- Updated the `physfs` implementation to handle file watch targets and events.
- Improved documentation and added unit tests to validate the new file watching features.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/modules/ui/Component.cpp

@@ -0,0 +1,33 @@
+#include "ui/Component.h"
+
+#include "ui/UISystem.h"
+
+namespace eve::ui {
+
+void Component::attach(UIHost *host) {
+    host_ = host;
+    dirty_ = true;
+}
+
+void Component::mountAs(const std::string &hostName) {
+    UIHost *h = UISystem::findHost(hostName);
+    if (!h) h = UIHost::createHost(hostName);
+    attach(h);
+    rebuild(true);
+}
+
+void Component::rebuild(bool forceFull) {
+    if (!host_) return;
+    WidgetDesc tree = build();
+    if (forceFull) host_->setTree(std::move(tree));
+    else host_->setTreeReconcile(std::move(tree));
+    dirty_ = false;
+}
+
+bool Component::updateIfDirty() {
+    if (!dirty_ || !host_) return false;
+    rebuild(false);
+    return true;
+}
+
+}  // namespace eve::ui