Add basic print action to text editor toolbar

[AlexAndBear]

Description

This PR adds a print action to the text editor toolbar and provides a basic print pipeline that renders editor HTML into a print iframe.

The print logic is extracted into a dedicated helper and uses a separate print stylesheet.

Disclaimer: this is intentionally a very basic implementation, but we need to provide a print/PDF export option so users can print or export their content as PDF.

Related Issue

• Fixes N/A

How Has This Been Tested?

• test environment: local development environment (macOS)
• test case 1: 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/markdown.spec.ts packages/web-pkg/tests/unit/editor/strategies/tiptapJson.spec.ts packages/web-pkg/tests/unit/editor/strategies/plainText.spec.ts
• test case 2: manually verified print action opens print flow and includes table/task-list/code print styling

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)