[AlexAndBear]

Description

This enhancement reorganizes text alignment controls in the text editor so toolbar and command-group structure are clearer and more consistent.

Changes made:

• Introduced a text-align menu action with child actions for left/center/right/justify (submenu pattern, similar to color controls)
• Added a new Text layout toolbar group and placed text-align before line-height inside that group
• Kept Lists as its own toolbar group before Text layout
• Kept a dedicated Text align command group for slash commands
• Extended strategy and editor-action tests for submenu behavior, ordering, and command execution

Related Issue

• Fixes N/A

How Has This Been Tested?

• test environment: local development environment (macOS), pnpm + Vitest
• test case 1: verify text-align is rendered as submenu action with expected child actions
• test case 2: verify toolbar group order (Lists before Text layout) and Text layout action order (text-align before line-height)
• test case 3: verify text-align command group and command execution paths
• pnpm test:unit --run packages/web-pkg/tests/unit/editor/composables/useEditorActions.spec.ts packages/web-pkg/tests/unit/editor/strategies/html.spec.ts packages/web-pkg/tests/unit/editor/strategies/tiptapJson.spec.ts

Types of changes

• Bugfix
• Enhancement (a change that doesn't break existing code or deployments)
• Breaking change (a modification that affects current functionality)
• Technical debt (addressing code that needs refactoring or improvements)
• Tests (adding or improving tests)
• Documentation (updates or additions to documentation)
• Maintenance (like dependency updates or tooling adjustments)