fix: continue cask upgrades after formula failures

[itzptk]

Summary

• Split upgradeAll into independent formula and cask phases so cask upgrades still run after a formula-phase failure unless the job is aborted.
• Collect per-phase success/failure output and emit one final failed job event that names the failed phase while preserving output from both phases.
• Added regression coverage for formula failure followed by a successful cask upgrade.

Verification

• RED before fix: npm run test:node -- electron/services/homebrew-service.test.ts -t "runs cask upgrades and reports both phases when formula upgrades fail" failed because only ['upgrade', '--formula'] was called.
• npm run test:node -- electron/services/homebrew-service.test.ts -t "runs cask upgrades and reports both phases when formula upgrades fail" → 1 passed.
• npm run test:node -- electron/services/homebrew-service.test.ts → 68 passed.
• npm run test:node → 15 files passed, 117 tests passed.
• npm run test:all → Angular 114 files / 252 tests passed, Node 15 files / 117 tests passed. Existing dark-mode media-query stderr warnings were emitted but the command exited 0.
• npm run build → Angular production build and Electron tsup build succeeded.

Closes #31