fix: rsync real-time output + refresh button

- Use read() + poll() instead of fgets() to handle rsync \r progress
- rsync uses \r for in-place progress updates, fgets() blocked on \n
- Added poll() with 200ms timeout for non-blocking read
- Added refresh button (view-refresh icon) in snapshot sidebar header
- Fixed duplicate build_menu/build_toolbar calls

src/main_window.cpp

@@ -142,8 +142,6 @@ void MainWindow::build_ui() {
 	gtk_container_add(GTK_CONTAINER(window_), vbox);
 
 	build_menu();
-	gtk_box_pack_start(GTK_BOX(vbox), toolbar_, FALSE, FALSE, 0);
-
 	build_toolbar();
 	gtk_box_pack_start(GTK_BOX(vbox), toolbar_, FALSE, FALSE, 0);
 
@@ -157,11 +155,21 @@ void MainWindow::build_ui() {
 
 	GtkWidget* left_header = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 6);
 	gtk_widget_set_margin_start(left_header, 8);
+	gtk_widget_set_margin_end(left_header, 4);
 	gtk_widget_set_margin_top(left_header, 6);
+	gtk_widget_set_margin_bottom(left_header, 6);
 	GtkWidget* left_title = gtk_label_new(NULL);
 	gtk_label_set_markup(GTK_LABEL(left_title), "<b>Snapshots</b>");
 	gtk_widget_set_halign(left_title, GTK_ALIGN_START);
 	gtk_box_pack_start(GTK_BOX(left_header), left_title, TRUE, TRUE, 0);
+
+	GtkWidget* refresh_btn = gtk_button_new_from_icon_name("view-refresh", GTK_ICON_SIZE_MENU);
+	gtk_widget_set_tooltip_text(refresh_btn, "Refresh snapshot list");
+	g_signal_connect(refresh_btn, "clicked", G_CALLBACK(+[](GtkWidget*, gpointer d) {
+		static_cast<MainWindow*>(d)->refresh_snapshot_list();
+	}), this);
+	gtk_box_pack_end(GTK_BOX(left_header), refresh_btn, FALSE, FALSE, 0);
+
 	gtk_box_pack_start(GTK_BOX(left_box), left_header, FALSE, FALSE, 0);
 	gtk_box_pack_start(GTK_BOX(left_box), gtk_separator_new(GTK_ORIENTATION_HORIZONTAL), FALSE, FALSE, 0);
 

src/rsync_manager.cpp

@@ -5,6 +5,7 @@
 #include <regex>
 #include <unistd.h>
 #include <sys/wait.h>
+#include <poll.h>
 
 RsyncManager::RsyncManager(Config& config) : config_(config) {}
 
@@ -62,22 +63,52 @@ bool RsyncManager::create_snapshot(const std::string& snapshot_name,
 	}
 
 	RsyncProgress prog;
-	char buf[4096];
-	while (fgets(buf, sizeof(buf), pipe)) {
+	int fd = fileno(pipe);
+	char raw[4096];
+	std::string accumulator;
+
+	/* Read raw bytes, split on \r and \n for real-time rsync progress */
+	while (true) {
 		if (cancel_requested_) break;
-		std::string line(buf);
 
-		/* Remove trailing newline */
-		if (!line.empty() && line.back() == '\n') line.pop_back();
-		if (!line.empty() && line.back() == '\r') line.pop_back();
-
-		{
-			std::lock_guard<std::mutex> lock(log_mutex_);
-			log_buffer_.push_back(line);
+		struct pollfd pfd = {fd, POLLIN, 0};
+		int pret = poll(&pfd, 1, 200);
+		if (pret < 0) break;
+		if (pret == 0) continue;
+		if (!(pfd.revents & POLLIN)) {
+			if (pfd.revents & (POLLHUP | POLLERR)) break;
+			continue;
 		}
 
-		parse_progress_line(line, prog);
-		prog.log_line = line;
+		ssize_t n = read(fd, raw, sizeof(raw) - 1);
+		if (n <= 0) break;
+		raw[n] = '\0';
+
+		accumulator += raw;
+
+		/* Split on \r and \n */
+		size_t pos;
+		while ((pos = accumulator.find_first_of("\r\n")) != std::string::npos) {
+			std::string line = accumulator.substr(0, pos);
+			accumulator.erase(0, pos + 1);
+
+			if (line.empty()) continue;
+
+			{
+				std::lock_guard<std::mutex> lock(log_mutex_);
+				log_buffer_.push_back(line);
+			}
+
+			parse_progress_line(line, prog);
+			prog.log_line = line;
+			if (on_progress) on_progress(prog);
+		}
+	}
+
+	/* Flush remaining */
+	if (!accumulator.empty()) {
+		parse_progress_line(accumulator, prog);
+		prog.log_line = accumulator;
 		if (on_progress) on_progress(prog);
 	}