fix: reset ANSI styling before printing prompt (#992)

* fix: reset ANSI styling before printing prompt

Reset any ANSI styling that may have been left by external commands
before printing the prompt. This ensures the prompt is not affected
by previous output styling that was not properly reset.

Fixes nushell/nushell#16384

Signed-off-by: majiayu000 <[email protected]>

* refactor: remove redundant ResetColor since SGR 0 resets all

---------

Signed-off-by: majiayu000 <[email protected]>

Author: majiayu000

src/painting/painter.rs

@@ -208,6 +208,11 @@ impl Painter {
         use_ansi_coloring: bool,
         cursor_config: &Option<CursorConfig>,
     ) -> Result<()> {
+        // Reset any ANSI styling that may have been left by external commands
+        // This ensures the prompt is not affected by previous output styling
+        // Note: Attribute::Reset (SGR 0) resets all attributes including colors
+        self.stdout.queue(SetAttribute(Attribute::Reset))?;
+
         self.stdout.queue(cursor::Hide)?;
 
         let screen_width = self.screen_width();