fix: resolve multiple reported game and web bugs

[asxrow66]

Summary

• Fix FAQ support link to point at the docs FAQ instead of the removed website route.
• Keep Epic third-party login links in the embedded auth web view instead of dropping target=_blank navigations.
• Stop the Store WebView from reloading back to the store home URL on SwiftUI updates/window focus changes.
• Surface Legendary “No saved credentials” failures as the existing Epic not-signed-in error.
• Make download progress parsing tolerate integer percentages and non-time ETA values.
• Fix local and Epic move operations to move into the selected folder, track them as move operations, and queue local moves.
• Launch local Windows games from their executable directory so nearby config/INI files resolve correctly.

Fixed issues

Fixes #266
Fixes #259
Fixes #218
Fixes #253
Fixes #217
Fixes #235
Fixes #237

Test plan

• xcodebuild -project Mythic.xcodeproj -scheme Mythic -configuration Debug -destination 'platform=macOS,arch=arm64' CODE_SIGNING_ALLOWED=NO build\n\nNote: Installed the missing Xcode Metal toolchain with xcodebuild -downloadComponent MetalToolchain after the first build attempt failed before compiling app code.

[asxrow66]

Closing this PR so I can replace it with a fresh branch/PR after fixing CI.