feat: make automatic update checks optional

[lzhgus]

Summary

Adds an "Automatically Check for Updates" toggle in Settings → General → Updates, so users can disable Sparkle's scheduled daily update checks (SUEnableAutomaticChecks was previously hardcoded to true in Info.plist with no way to opt out).

• New toggle binds to SPUUpdater.automaticallyChecksForUpdates (Sparkle persists it to UserDefaults; Info.plist default stays true, so behavior is unchanged for existing users)
• "Automatically Install Updates" is greyed out when automatic checks are off, since background downloads only trigger after scheduled checks
• Manual "Check for Updates" button remains fully functional when automatic checks are disabled
• Updated the manual-check row sublabel ("Automatically checks daily" → "Manually check for a new version") to avoid implying checks are always on

Closes #219

Test plan

• xcodebuild -scheme Capso -configuration Debug build succeeds
• Toggle off → relaunch → verify no scheduled check fires and manual check still works
• Toggle state persists across launches

---

Note

Low Risk
Localized preferences and Sparkle binding changes; default behavior remains automatic checks via Info.plist.

Overview
Users can now turn off daily background update checks from Settings → General → Updates via a new "Automatically Check for Updates" toggle, wired through UpdateManager to Sparkle’s SPUUpdater.automaticallyChecksForUpdates (with KVO so UI stays in sync when Sparkle changes the value).

"Automatically Install Updates" is disabled when automatic checks are off, since background installs depend on scheduled checks. The manual Check for Updates row copy is updated to describe on-demand checks instead of implying daily automatic checks.

^{Reviewed by Cursor Bugbot for commit bf8f796. Bugbot is set up for automated code reviews on this repo. Configure here.}

[cursor]

Cursor Bugbot has reviewed your changes using default effort and found 1 potential issue.

^{❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.}

^{Reviewed by Cursor Bugbot for commit bf8f796. Configure here.}

[cursor]

Install toggle stays enabled

Medium Severity

GeneralSettingsView keeps updateManager as a plain optional instead of observing UpdateManager, so changes to automaticallyChecksForUpdates do not reliably invalidate the settings body. The new .disabled(!updateManager.automaticallyChecksForUpdates) on “Automatically Install Updates” can stay stale, leaving that toggle interactive after automatic checks are turned off.

Additional Locations (1)

• App/Sources/Preferences/Tabs/GeneralSettingsView.swift#L9-L10

 

^{Reviewed by Cursor Bugbot for commit bf8f796. Configure here.}