chore: bump version 0.9.9

[LucasXu0]

Feature Preview

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PR Checklist

• My code adheres to AppFlowy's Conventions
• I've listed at least one issue that this PR fixes in the description above.
• I've added a test(s) to validate changes in this PR, or this PR only contains semantic changes.
• All existing tests are passing.

Summary by Sourcery

Bump project version to 0.9.9 and update changelog with new release notes

Build:

• Bump APPFLOWY_VERSION in Makefile.toml to 0.9.9
• Update Flutter package version to 0.9.9 in pubspec.yaml

Documentation:

• Add release notes section for version 0.9.9 to CHANGELOG.md

[sourcery-ai]

Reviewer's Guide

This PR bumps the project to version 0.9.9 by updating version fields in build and package configs and appending detailed release notes for desktop and mobile features in the changelog.

Flow diagram for version bump process

flowchart TD
    A["Update version in Makefile.toml"] --> B["Update version in pubspec.yaml"]
    B --> C["Append release notes to CHANGELOG.md"]
    C --> D["Project is now at version 0.9.9"]

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File-Level Changes

Change	Details	Files
Add release notes for version 0.9.9	Insert version 0.9.9 heading with release date Add desktop and mobile new feature entries Remove stray whitespace and update formatting	CHANGELOG.md
Bump build config version to 0.9.9	Update APPFLOWY_VERSION in Makefile.toml	frontend/Makefile.toml
Bump Flutter package version to 0.9.9	Update version in pubspec.yaml	frontend/appflowy_flutter/pubspec.yaml

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[sourcery-ai]

Hey there - I've reviewed your changes and they look great!

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