fix: drain crossterm characters in zellij in kitty contexts to prevent DA1 responses from entering prompt

.omo/run-continuation/ses_026efaf26ffe448NpJ40MEYYDx.json

@@ -0,0 +1,10 @@
+{
+  "sessionID": "ses_026efaf26ffe448NpJ40MEYYDx",
+  "updatedAt": "2026-08-18T01:47:32.627Z",
+  "sources": {
+    "background-task": {
+      "state": "idle",
+      "updatedAt": "2026-08-18T01:47:32.627Z"
+    }
+  }
+}

src/config/app_config.rs

@@ -1,6 +1,6 @@
 use crate::client::{ClientConfig, Model, ModelType, list_models};
 use crate::render::{MarkdownRender, RenderOptions};
-use crate::utils::{IS_STDOUT_TERMINAL, NO_COLOR, decode_bin, get_env_name};
+use crate::utils::{IS_STDOUT_TERMINAL, NO_COLOR, decode_bin, drain_stale_tty_input, get_env_name};
 
 use super::paths;
 use anyhow::{Context, Result, anyhow, bail};
@@ -616,14 +616,18 @@ impl AppConfig {
         if self.highlight && self.theme.is_none() {
             if let Some(v) = super::read_env_value::<String>(&get_env_name("theme")) {
                 self.theme = v;
-            } else if *IS_STDOUT_TERMINAL
-                && let Ok(color_scheme) = color_scheme(QueryOptions::default())
-            {
-                let theme = match color_scheme {
-                    ColorScheme::Dark => "dark",
-                    ColorScheme::Light => "light",
-                };
-                self.theme = Some(theme.into());
+            } else if *IS_STDOUT_TERMINAL {
+                if let Ok(color_scheme) = color_scheme(QueryOptions::default()) {
+                    let theme = match color_scheme {
+                        ColorScheme::Dark => "dark",
+                        ColorScheme::Light => "light",
+                    };
+                    self.theme = Some(theme.into());
+                }
+                // The OSC/DA1 reply can arrive after colorsaurus stops reading
+                // (observed under zellij-in-kitty). Drain any late reply bytes so
+                // they are neither echoed nor read as line-editor input.
+                drain_stale_tty_input();
             }
         }
         if let Some(v) = super::read_env_value::<String>(&get_env_name("left_prompt")) {

src/repl/mod.rs

@@ -19,8 +19,8 @@ use crate::config::{AssetCategory, paths};
 use crate::function::supervisor::{GuardrailAction, check_pending_agents_guardrail};
 use crate::render::render_error;
 use crate::utils::{
-    AbortSignal, SHELL, abortable_run_with_spinner, create_abort_signal, dimmed_text, run_command,
-    set_text, temp_file,
+    AbortSignal, SHELL, abortable_run_with_spinner, create_abort_signal, dimmed_text,
+    drain_stale_tty_input, run_command, set_text, temp_file,
 };
 
 use crate::sandbox::SANDBOX_ENV_FLAG;
@@ -411,6 +411,10 @@ Type ".help" for additional help.
             }
         }
 
+        // Discard any stray terminal-query reply bytes (e.g. late colorsaurus
+        // OSC 11 / DA1 responses) so they don't get injected into the prompt.
+        drain_stale_tty_input();
+
         loop {
             if self.abort_signal.aborted_ctrld() {
                 break;