Fix: Share button not found on non-English browser locales

[blue-int]

Summary

• Fix "Share button not found" error on non-English browser locales
• Add locale-independent CSS selector as primary fallback
• Remove Chrome Web Store update_url for Edge compatibility

Problem

openShareDialog() relies on button[aria-label="Share"], but chess.com localizes aria-label based on browser locale (e.g. "공유" in Korean). All selectors miss.

Changes

1. Locale-independent selector (getpgn.js)

Added [data-cy="sidebar-share-icon"] as the first selector. data-cy is not localized:

var shareButton =
    document.querySelector('[data-cy="sidebar-share-icon"]') || // Locale-independent
    document.querySelector('[data-cy="analysis-secondary-controls-menu-open-share"]') ||
    document.querySelector('button[aria-label="Share"]') || // English
    document.querySelector('button[aria-label="공유"]') || // Korean
    // ... remaining fallbacks

2. Remove update_url (manifest.json)

Removed "update_url": "https://clients2.google.com/service/update2/crx" per Microsoft's porting guide.

Test plan

• Tested on Edge (Korean locale) — confirmed working
• Verified [data-cy="sidebar-share-icon"] exists on chess.com game pages