Spell

[PraveenDevamane]

This PR implements the feature described in issue #1165: a real-time spell checker in the AppFlowy Editor. It includes dictionary loading, word scanning & suggestion generation, visual underlines for misspelled words, hover suggestion menus, and word replacement functionality — all integrated in a performant, non-intrusive way.

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Pull request overview

This PR implements a comprehensive spell checking feature for the AppFlowy Editor, adding real-time dictionary-based spell checking with visual underlines, hover-based suggestion menus, and autocorrect functionality for desktop platforms.

Key Changes

• Dictionary-based spell checker with a 10,000-word dictionary and smart exclusion rules for technical terms, proper nouns, and code identifiers
• Visual spell check indicators with red wavy underlines for misspelled words integrated into the rich text rendering
• Interactive suggestion system with hover-based popup menus for word corrections and automatic word replacement

Reviewed changes

Copilot reviewed 10 out of 11 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
lib/src/service/spell_check/spell_checker.dart	Core spell checker implementation with dictionary loading, word validation, Levenshtein-based suggestions, and grammatical variation detection
lib/src/editor/block_component/rich_text/appflowy_rich_text.dart	Integration of spell checking into rich text rendering with word tokenization, async checking, and visual underlines
lib/src/editor/block_component/rich_text/spell_check_overlay.dart	Hover-based overlay widget for displaying spell check suggestions and handling word replacements
lib/src/editor/block_component/rich_text/spell_hover.dart	Reusable hover widget for managing suggestion popups with mouse region handling
lib/src/editor/editor_component/service/ime/delta_input_on_replace_impl.dart	Desktop autocorrect integration that automatically applies top suggestions during text input
test/spell_checker_test.dart	Comprehensive test suite covering dictionary lookup, exclusion rules, suggestions, and grammatical variations
pubspec.yaml	Asset configuration to include the dictionary file
assets/dictionary/words.txt	10,000-word English dictionary for spell checking
example/macos/Runner.xcodeproj/project.pbxproj	macOS deployment target update from 10.14 to 10.15
example/macos/Podfile	Podfile platform version update to match deployment target
devtools_options.yaml	New DevTools configuration file

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