[FEAT] Add TaskConversionReaction for live checkbox creation

[rutvik-at-pieces]

Summary

Adds a new TaskConversionReaction that converts a ParagraphNode into a TaskNode when the user types [] or [x] at the start of a paragraph — matching the existing pattern used for unordered (- ) and ordered (1. ) list item conversions.

Changes

• New TaskConversionReaction class in default_document_editor_reactions.dart
  • Extends ParagraphPrefixConversionReaction (same base as UnorderedListItemConversionReaction)
  • Detects [] (incomplete task) and [x] (complete task) prefixes
  • Replaces the ParagraphNode with a TaskNode, preserving remaining text content
  • Sets isComplete based on whether x is present in the prefix
  • Configurable via allowConversionOfNonEmptyParagraphs flag (defaults to true)

Motivation

Previously, there was no way to create a TaskNode by typing in the editor — users could only get checkboxes from deserialized markdown. This brings task creation UX in line with how list items already work (type a prefix, get a converted node).

Related PRs

• pieces-app/pieces_platform_client_sdk#574 — Registers this reaction in the Pieces editor pipeline + handles nested task indentation in serialization, deserialization, and PDF export

[Copilot]

Pull request overview

Adds a new paragraph prefix conversion reaction intended to convert a ParagraphNode into a TaskNode when the user types a task checkbox prefix at the start of a paragraph.

Changes:

• Introduces TaskConversionReaction to detect a task prefix and replace a ParagraphNode with a TaskNode.
• Adds configurability via allowConversionOfNonEmptyParagraphs to control whether conversion triggers for non-empty paragraphs.

Comments suppressed due to low confidence (3)

super_editor/lib/src/default_editor/default_document_editor_reactions.dart:177

• The task prefix regex only matches [] or [x], but the rest of the codebase serializes tasks using GitHub-style - [ ] / - [x] (see lib/src/infrastructure/serialization/markdown/document_to_markdown_serializer.dart:351-378). Consider also matching [ ] (and allowing uppercase X) so users can type the common task syntax.

  static final _taskInEmptyParagraphPattern = RegExp(r'^\s*\[x?\]\s+$');
  static final _taskInNonEmptyParagraphPattern = RegExp(r'^\s*\[x?\]\s+');

super_editor/lib/src/default_editor/default_document_editor_reactions.dart:197

• match.contains('x') is case-sensitive, so [X] won't be treated as complete (especially if the regex is made case-insensitive). Prefer an explicit, case-insensitive check for the [x] token.

    final isComplete = match.contains('x');

super_editor/lib/src/default_editor/default_document_editor_reactions.dart:194

• This new conversion behavior should have widget test coverage alongside the other paragraph conversions in test/super_editor/text_entry/paragraph_conversions_test.dart (e.g., for [] / [x] / [ ] in empty and non-empty paragraphs, and for allowConversionOfNonEmptyParagraphs: false).

  void onPrefixMatched(
    EditContext editContext,
    RequestDispatcher requestDispatcher,
    List<EditEvent> changeList,
    ParagraphNode paragraph,

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