feat: show plugin update time in marketplace details

[Soulter]

Summary

• show the marketplace plugin updated_at value in the plugin detail information table
• format the timestamp with the active dashboard locale and hide missing or invalid values
• add localized labels for Simplified Chinese, English, and Russian

Why

Marketplace entries already include an update timestamp, but the plugin detail page did not expose it. Displaying it helps users understand how recently a plugin was maintained before installing it.

Validation

• pnpm build
• pnpm typecheck
• uv run ruff format --check .
• uv run ruff check .

Summary by Sourcery

Display marketplace plugin update time in the plugin detail view using localized formatting.

New Features:

• Show the marketplace plugin last updated time in the plugin detail information table.

Enhancements:

• Format the plugin update timestamp according to the active dashboard locale and hide missing or invalid values.
• Add localized labels for the plugin update time in Simplified Chinese, English, and Russian.

[sourcery-ai]

Hey - I've left some high level feedback:

• The updatedAtDisplay computed value relies on new Date(value), which can behave inconsistently for non-ISO or timezone-less strings; consider normalizing the timestamp format or using a dedicated date parsing/formatting utility to ensure consistent results across browsers.
• If the project has a centralized date/time formatting helper, it might be preferable to reuse it instead of creating a new Intl.DateTimeFormat here so that date formats are consistent across the dashboard and easier to adjust in one place.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The `updatedAtDisplay` computed value relies on `new Date(value)`, which can behave inconsistently for non-ISO or timezone-less strings; consider normalizing the timestamp format or using a dedicated date parsing/formatting utility to ensure consistent results across browsers.
- If the project has a centralized date/time formatting helper, it might be preferable to reuse it instead of creating a new `Intl.DateTimeFormat` here so that date formats are consistent across the dashboard and easier to adjust in one place.

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