perf: billing styles and interaction

[Sky-FE]

No description provided.

[Copilot]

Pull Request Overview

This PR updates the billing system UI to improve performance by replacing router navigation with a modal-based upgrade flow and standardizes color schemes for billing level tags.

• Replaces router-based navigation with modal store for upgrade interactions
• Updates color scheme for billing level tags from mixed colors to standardized gray/emerald/blue palette
• Removes unused router dependency and Chinese comment

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
useBillingLevelConfig.ts	Updates CSS classes for billing level tags to use consistent color scheme
UpgradeWrapper.tsx	Replaces router navigation with modal store for upgrade flow and removes unused imports

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