Fix Windows update sha512 checksum mismatch by disabling differential downloads

[Copilot]

Description of Changes

Windows users encounter sha512 checksum mismatches when updating, indicating the updater attempts differential downloads despite disableDifferentialDownload = true. The electron-updater library has multiple update code paths that must be explicitly disabled on Windows.

Changes:

• Set autoUpdater.disableWebInstaller = true for Windows in addition to existing disableDifferentialDownload
• Add platform-aware logging to track update configuration at runtime
• Preserve macOS/Linux default behavior (differential updates remain enabled)

Configuration:

if (process.platform === 'win32') {
  autoUpdater.disableDifferentialDownload = true;  // Existing
  autoUpdater.disableWebInstaller = true;          // Added
}

This forces full installer downloads (~113MB) on Windows while macOS and Linux continue using efficient differential updates. Build config already has "differentialPackage": false in NSIS settings; runtime now matches.

Linked Issues / Tickets

Fixes Windows 11 update failure with sha512 checksum mismatch error.

Testing Procedure

• Verified configuration logic for all platforms (Windows, macOS, Linux)
• Build successful with no errors
• Confirmed single file change, minimal diff

Checklist:

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have updated CHANGELOG.md with my changes
• I have run npm run doc and npm run lint one final time before requesting a review
• I have fixed all linter errors to ensure these changes are compliant with ts-standard
• I have run npm version patch so that my changes will trigger a new version to be released when they are merged

Original prompt

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This section details on the original issue you should resolve

<issue_title>BSV Desktop update fails on Windows 11</issue_title>
<issue_description>My BSV Desktop v0.8.13 reported there was an update, v0.8.14.

I tried to install it but the update failed. I have tried a few times.

Each time I see the message: "update error: sha512 checksum mismatch, expected ORQ...., got z6k...

I use an up-to-date Windows 11.

<agent_instructions>Ensure that the Download Update URL used by the update modal is platform specific. On MacOS updates are working properly, so don't change anything there, but if we're on Windows, we have an error when attempting to download. Since the error message mentions a chunk, it seems like we have not properly implemented the proper stable windows approach which is to download the whole release, rather than attempting to download the diff, since this is known to be an electron windows issue.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes BSV Desktop update fails on Windows 11 #12

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