Upgrade Electron after Linux AppIndicator regression is fixed

[Hronom]

Context

Bronom is pinned to Electron 42.4.1 because Electron 43.3+ regresses Linux AppIndicator/StatusNotifierItem tray integration. On Ubuntu 24.04.4 LTS with GNOME Shell 46.0 on X11, Electron 43.4.0 replaces Bronom's real tray icon with a three-dot placeholder and the tray menu does not open. The same Bronom build works correctly with Electron 42.4.1.

Upstream: electron/electron#52674

Blocked by

• Appindicator receiving no response from Electron 43.3 applications electron/electron#52674 is fixed in a released Electron version.

Upgrade work

• Upgrade Electron from the exact 42.4.1 compatibility pin to a supported version containing the upstream fix.
• Confirm Bronom's real tray icon is visible on Ubuntu GNOME with AppIndicators enabled.
• Confirm left- and right-click both open the tray context menu.
• Confirm browser_request_user_attention visibly pulses the tray icon.
• Confirm focusing or interacting with Bronom clears the attention state, while MCP-triggered focus does not.
• Run unit, typecheck/build, and the full real-Electron Playwright integration suite.
• Remove or update the compatibility note in CHANGELOG.md.

Reproduction environment

• Bronom: v1.2.0
• Broken: Electron 43.4.0
• Working: Electron 42.4.1
• OS: Ubuntu 24.04.4 LTS
• Desktop: GNOME Shell 46.0, X11
• Architecture: x86_64