v1.5.3

✨ New Features

• Extract Cancel: Cancel button now works during extraction (all formats)
  • .zgx/.zip: cancel mid-file (byte-level)
  • .rar: cancel between files (C library limitation)
  • Split: cancel during SHA256 verification
  • All formats: shows "Cancelled" (amber) + exits cleanly
• Split Compress: multi-volume .zgx archives
  • Right-click → LRGEX → Split Compress
  • Per-part SHA256 trailers for integrity
  • Missing parts detected upfront with clear message

🔧 Fixes

• Auto-update elevation: detects admin/UAC-disabled correctly (is_process_elevated)
• Update throttle: once per day (prevents 20s hangs on every launch)
• Declined update: 30-day expiry (re-asks after 30 days)
• GUI failure state: shows actual error message + Close button
• Exit code: non-zero on failure/cancel
• Progress bar stops animating on Failed
• Version badge moved to top-right (no overlap with buttons)
• Window fixed size (cannot resize)
• Friendly error messages for update failures
• /SILENT shows progress during update

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