Add live event calendar

[Emissaryx]

What

• adds an /events page for active and upcoming live events, city sieges, and Zandri expeditions
• shows start/end times in both the visitor's local timezone and Server Time (CET/CEST via Europe/Zurich)
• adds active/upcoming states and automatically updating start/end countdowns
• links the calendar from the main killboard tabs and provides a responsive card layout

Why

The production API already exposes event scheduling data, but players currently have no killboard view that turns it into a convenient calendar.

API note

The query intentionally omits event IDs. At present, requesting id on a LiveEvent produces an HC0053 resolver cast error that can null the events response. The stable fields used here are __typename, name, startTime, and endTime.

Validation

• npm test
• Prettier check for all changed source files
• focused type-aware lint of src/pages/Events.tsx

Existing dependency audit, Sass deprecation, bundle-size, and unrelated lint warnings remain unchanged.

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