Fix rejected auto-updater promise handling

[bferanmi806-sketch]

Summary

Fixes rejected electron-updater operations being able to escape as unhandled Promise rejections and removes the shared mutable check-origin state that could misclassify overlapping update checks.

• handle synchronous throws and asynchronous rejections from checkForUpdates() and downloadUpdate()
• keep automatic/background check failures silent and return the updater to idle
• surface manual check and download failures through the existing error state
• preserve manual intent when background/manual checks share an in-flight updater Promise
• make each operation's Promise rejection authoritative instead of inferring ownership from the updater's generic error event
• add focused regression coverage for overlapping checks and downloads

Tests

• pnpm test:updater — 9 passed
• pnpm typecheck — passed
• pnpm test — 273 passed, 6 skipped; updater tests 9 passed
• pnpm check:electron — passed
• pnpm build — passed
• git diff --check — passed
• Windows packaging was previously verified successfully with pnpm package:win

Packaged Ubuntu unavailable-feed smoke was not run locally.

Fixes #78

Summary by CodeRabbit

• Bug Fixes

  • Improved update checking and downloading to prevent duplicate operations.
  • Manual update checks now take priority over background checks.
  • Update status and errors are reported more consistently, including synchronous and asynchronous failures.
  • Background update errors no longer interrupt users.

• Tests

  • Added coverage for concurrent checks, downloads, updater events, and failure handling.
  • Expanded the test command to include updater-specific tests.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 284008b8-ec37-4d62-96c5-fe00a42130c3

📥 Commits

Reviewing files that changed from the base of the PR and between 30090b8 and 0ed7661.

📒 Files selected for processing (2)

• electron/updater-coordinator.mjs
• electron/updater-coordinator.node-test.mjs

🚧 Files skipped from review as they are similar to previous changes (1)

• electron/updater-coordinator.mjs

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📝 Walkthrough

Walkthrough

The pull request adds an updater coordinator for checks and downloads. It handles concurrent operations, synchronous throws, rejected promises, and updater events. Electron IPC and scheduled checks use the coordinator. Node tests cover operation and state behavior.

Changes

Updater coordination

Layer / File(s)	Summary
Coordinator operation handling electron/updater-coordinator.mjs	The coordinator deduplicates checks and downloads, upgrades shared checks for manual callers, publishes updater states, handles failures, and clears settled operations.
IPC and scheduled-check integration electron/updater.mjs	IPC handlers and scheduled checks delegate to the coordinator. Development and unavailable-updater paths reset state.
Coordination tests and test command electron/updater-coordinator.node-test.mjs, package.json	Node tests cover failures, concurrency, updater events, download precedence, and deterministic errors. The main test command runs the updater tests.

Estimated code review effort: 3 (Moderate) | ~25 minutes

Merge Risk: ⚪ Minimal · up to 0ed76

The PR improves updater error handling and overlapping-check behavior, with the reported validation checks passing; no actionable merge-blocking risk remains beyond normal review.

Sequence Diagram(s)

sequenceDiagram
  participant IPC_or_Timer
  participant updaterCoordinator
  participant updater
  participant setState
  IPC_or_Timer->>updaterCoordinator: check(manual) or download()
  updaterCoordinator->>updater: invoke updater operation
  updater-->>updaterCoordinator: lifecycle event or Promise settlement
  updaterCoordinator->>setState: publish updater status

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🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the primary change: handling rejected auto-updater promises.
Description check	✅ Passed	The description explains the changes, rationale, and verification results, but it omits the template headings and checklist.
Linked Issues check	✅ Passed	The implementation addresses issue #78 by handling throws and rejections, preserving operation intent, updating error states, and adding regression tests.
Out of Scope Changes check	✅ Passed	The changes remain within scope by updating updater coordination, adding focused tests, and wiring the updater test command.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

Actionable comments posted: 1

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Inline comments:
In `@electron/updater-coordinator.mjs`:
- Around line 5-10: Update handleRejectedOperation in
electron/updater-coordinator.mjs (lines 5-10) to track when a background check
has been superseded by a download and suppress its idle transition in that case,
preserving download-owned state including completed manual download errors.
Extend electron/updater-coordinator.node-test.mjs (lines 118-144) to emit
download progress before rejecting the check and verify the download state
remains authoritative in both settlement orders.

🪄 Autofix

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 1d6a0519-3d0a-447c-a2d9-afa76800ff9d

📥 Commits

Reviewing files that changed from the base of the PR and between 388f9e9 and 30090b8.

📒 Files selected for processing (4)

• electron/updater-coordinator.mjs
• electron/updater-coordinator.node-test.mjs
• electron/updater.mjs
• package.json