Fix Wireshark Sparkle updates selecting Intel builds on Apple Silicon

[moreaki]

Summary

This fixes Wireshark/Stratoshark Sparkle updates resolving the wrong architecture-specific feed on Apple Silicon, which could lead to an ARM install being updated to the Intel build.

Closes #454.

Root cause

Latest currently reads SUFeedURL directly from the target app bundle and treats it as authoritative.

For Wireshark and Stratoshark, the bundled macOS plist ships a static SUFeedURL that points to the x86-64 appcast path. Their own updater code then rewrites that URL at runtime based on the actual build architecture (x86-64 vs arm64).

That means external Sparkle consumers like Latest can end up using the Intel feed for an Apple Silicon install even though the installed bundle itself is ARM.

There was also a secondary precision issue in our Sparkle path: we resolved bundles by bundle identifier during check/install instead of preferring the exact on-disk bundle URL selected by the user.

Changes

• detect Wireshark/Stratoshark architecture-specific feed URLs and rewrite the feed path to match the installed bundle's executable architecture
• prefer Bundle(url:) over Bundle(identifier:) when creating Sparkle updaters for both checking and installing
• add regression coverage for the Wireshark ARM feed rewrite path

Verification

• xcodebuild build -project 'Latest.xcodeproj' -scheme 'Latest' -destination 'platform=macOS' CODE_SIGNING_ALLOWED=NO CODE_SIGNING_REQUIRED=NO CODE_SIGN_IDENTITY=''

I also added a focused XCTest for the feed rewrite logic. I could not execute the test target successfully in this local environment because Latest Tests failed to resolve the private framework module dependencies CommerceKit and StoreFoundation, but the app build itself succeeds.

Upstream

I opened an upstream Wireshark issue about the bundled Sparkle metadata always shipping an x86-64 SUFeedURL:

• https://gitlab.com/wireshark/wireshark/-/work_items/21096

[rgoldberg]

I haven't read through all the code, but wouldn't it make sense to use the architecture of the actual app for all apps, not just for Wireshark/Stratoshark, in case other apps behave the same way?