Update core modules and add GUI panels

crates/xserial-gui/src/panels/sidebar.rs

@@ -0,0 +1,51 @@
+use crate::app::ConnectionStatus;
+use egui::{Color32, RichText, Ui};
+
+pub fn render(
+    ui: &mut Ui,
+    sessions: &[(u64, ConnectionStatus)], // (id, 连接状态)
+    active: &mut usize,                   // 当前选中的会话索引
+    on_new: &mut bool,                    // 点击了"新建"
+    on_delete: &mut Option<usize>,        // 点击了"删除"
+) {
+    ui.heading("Sessions");
+
+    // 新建按钮 — 绿色文字
+    if ui
+        .button(RichText::new("+ New Session").color(Color32::GREEN))
+        .clicked()
+    {
+        *on_new = true;
+    }
+
+    ui.separator();
+
+    // 会话列表
+    for (i, (id, status)) in sessions.iter().enumerate() {
+        let (color, icon) = match status {
+            ConnectionStatus::Connected => (Color32::GREEN, "●"),
+            ConnectionStatus::Disconnected => (Color32::GRAY, "○"),
+            ConnectionStatus::Connecting => (Color32::YELLOW, "◌"),
+            ConnectionStatus::Error(_) => (Color32::RED, "⨉"),
+        };
+
+        // selectable_label: 点击高亮，clicked() 判断是否被点击
+        let label = format!("{} Session {}", icon, id);
+        if ui
+            .selectable_label(*active == i, RichText::new(label).color(color))
+            .clicked()
+        {
+            *active = i;
+        }
+    }
+
+    ui.separator();
+
+    // 删除按钮 — 红色文字
+    if ui
+        .button(RichText::new("Delete").color(Color32::RED))
+        .clicked()
+    {
+        *on_delete = Some(*active);
+    }
+}