Extract constants to separate module

cove-tui/src/chat/tree/constants.rs

@@ -0,0 +1,23 @@
+use crossterm::style::{ContentStyle, Stylize};
+
+pub const TIME_FORMAT: &str = "%H:%M ";
+pub const TIME_WIDTH: usize = 6;
+
+pub fn style_time() -> ContentStyle {
+    ContentStyle::default().grey()
+}
+
+pub fn style_time_inverted() -> ContentStyle {
+    ContentStyle::default().black().on_white()
+}
+
+pub const INDENT: &str = "│ ";
+pub const INDENT_WIDTH: usize = 2;
+
+pub fn style_indent() -> ContentStyle {
+    ContentStyle::default().grey()
+}
+
+pub fn style_indent_inverted() -> ContentStyle {
+    ContentStyle::default().black().on_white()
+}