feat(mcp): enhance MCP server registration with error handling and improve transport process management

refactor: update various tools for better error handling and path resolution
fix: improve markdown rendering and input display in TUI

apps/interfaces/tui/src/view/mod.rs

@@ -147,7 +147,13 @@ fn render_input_bar(frame: &mut Frame, area: Rect, state: &AppStateRest) {
     } else {
         let (before, after) = input_text.split_at(cursor_pos);
         spans.push(Span::raw(before.to_string()));
-        let cursor_char = if after.is_empty() { " " } else { &after[..1] };
+        let (cursor_char, after_char) = if after.is_empty() {
+            (" ".to_string(), "")
+        } else {
+            let c = after.chars().next().unwrap();
+            let char_len = c.len_utf8();
+            (c.to_string(), &after[char_len..])
+        };
         spans.push(Span::styled(
             cursor_char,
             Style::default()
@@ -155,8 +161,8 @@ fn render_input_bar(frame: &mut Frame, area: Rect, state: &AppStateRest) {
                 .fg(Theme::BG)
                 .add_modifier(Modifier::BOLD),
         ));
-        if after.len() > 1 {
-            spans.push(Span::raw(after[1..].to_string()));
+        if !after_char.is_empty() {
+            spans.push(Span::raw(after_char.to_string()));
         }
     }