fix: allow downgrade from nightly to stable by not overriding autoUpdater.allowDowngrade

[shoaib050326]

Summary

• Removes the explicit allowDowngrade = false override for the stable
  update channel that prevented electron-updater from finding older
  stable releases as valid downgrades from nightly builds.
• Simplifies the redundant allowDowngrade save/restore toggle around
  the channel-switch update check, since applyAutoUpdaterChannel
  now correctly preserves the channel setter's default true.
• Adds a missing test: stable versions are accepted on the stable
  channel.

Root cause

applyAutoUpdaterChannel set autoUpdater.channel = channel (which
electron-updater auto-follows with allowDowngrade = true), then
immediately overrode it to channel === "nightly". For the "latest"
channel this forced allowDowngrade = false, blocking any stable
downgrade after a nightly install.

Risk

Low. The channel setter's allowDowngrade = true default is the
documented electron-updater behavior and is appropriate for both
channels. No other allowDowngrade assignments exist in the codebase.

Rollback

Revert this commit. No data migration needed.

Closes #2340

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Note

Medium Risk
Changes Electron auto-update channel switching behavior, which can affect which releases are considered valid and how clients update/rollback. Risk is limited in scope but could impact update eligibility if electron-updater defaults differ across platforms.

Overview
Desktop auto-updater channel switching now preserves electron-updater’s allowDowngrade behavior instead of forcing it based on channel, enabling nightly installs to roll back to stable releases.

This removes the temporary allowDowngrade toggle around the channel-change update check and updates logging to report the effective autoUpdater.allowDowngrade. Adds a test to ensure stable versions are accepted on the latest channel.

^{Reviewed by Cursor Bugbot for commit 7f300a8. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Fix downgrade from nightly to stable by preserving autoUpdater.allowDowngrade

Previously, applyAutoUpdaterChannel in main.ts overrode autoUpdater.allowDowngrade based on the selected channel, and the SET_CLIENT_SETTINGS_CHANNEL handler temporarily forced it to true during channel-change update checks. This prevented stable versions from being installed when downgrading from nightly.

• applyAutoUpdaterChannel no longer sets allowDowngrade; it only sets channel and allowPrerelease
• The SET_CLIENT_SETTINGS_CHANNEL handler calls checkForUpdates('channel-change') directly without modifying allowDowngrade
• A new test in updateChannels.test.ts verifies stable versions are accepted on the stable channel

^{Macroscope summarized 7f300a8.}

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Approvability

Verdict: Needs human review

This PR modifies the desktop app's auto-update downgrade behavior by removing explicit control of allowDowngrade. Changes to update mechanisms affect how users receive version updates and warrant human review to ensure intended behavior.

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