refactor(coding-agent/src): migrated keyword decorators to shared helper

- Replaced composed keyword decorators in `CustomEditor.decorateText` with `highlightMagicKeywords`.
- Adjusted `UserMessageComponent` rendering to use `highlightMagicKeywords` with `keywordReset` for consistent foreground.

packages/coding-agent/src/modes/components/custom-editor.ts

@@ -1,8 +1,6 @@
 import { Editor, type KeyId, matchesKey, parseKittySequence } from "@oh-my-pi/pi-tui";
 import type { AppKeybinding } from "../../config/keybindings";
-import { highlightOrchestrate } from "../orchestrate";
-import { highlightUltrathink } from "../ultrathink";
-import { highlightWorkflow } from "../workflow";
+import { highlightMagicKeywords } from "../magic-keywords";
 
 type ConfigurableEditorAction = Extract<
 	AppKeybinding,
@@ -47,8 +45,9 @@ const DEFAULT_ACTION_KEYS: Record<ConfigurableEditorAction, KeyId[]> = {
  * Custom editor that handles configurable app-level shortcuts for coding-agent.
  */
 export class CustomEditor extends Editor {
-	/** Gradient-highlight the "ultrathink" / "orchestrate" / "workflow" keywords as the user types them. */
-	decorateText = (text: string): string => highlightWorkflow(highlightOrchestrate(highlightUltrathink(text)));
+	/** Gradient-highlight the "ultrathink" / "orchestrate" / "workflow" keywords as the user types
+	 *  them, skipping any occurrence inside code spans, fenced blocks, or XML sections. */
+	decorateText = (text: string): string => highlightMagicKeywords(text);
 	onEscape?: () => void;
 	shouldBypassAutocompleteOnEscape?: () => boolean;
 	onClear?: () => void;