feat(admin): enhance TagInput with validation limits and template optimization

[idris999-c]

feat(admin): enhance TagInput with validation limits and template optimization

📄 Summary

Enhance the TagInput component to provide a more robust and flexible tagging experience. This PR introduces strict validation enforcement (hard limits), prevents duplicate entries, and optimizes the internal template structure using Svelte 5 snippets. The component now offers better layout control and a more refined UI, aligning with the project's premium design standards.

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🧩 Affected Module

• Source Code
• Documentation
• CI / Infra

Component Updates

• TagInput: Implemented centralized validation logic, hard-coded min/max tag limits, and optimized the template with Svelte 5 snippets for better maintainability and performance. Removed boxed styling from the delete action for a cleaner aesthetic.
• Input: Added unstyled support to allow raw input rendering when used inside complex parent containers like TagInput. Exposed the onkeydown handler for better event management.
• Row: Introduced an inline flex property to support specialized layouts where the row should only occupy the width of its content.

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✅ Checklist

• My branch name follows format: feat/add-taginput-component
• My PR title follows Conventional Commits format
• My code is formatted with Prettier
• I ran static analysis and resolved warnings
• I ran tests successfully
• I ensured this PR has no unrelated changes
• This PR is ready for review

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🔗 Related Issue

Closes #221