fix: force repaint on system resume to prevent white screen on macOS wake

[itsbkm]

Summary

• macOS sleep/wake can leave Chromium's GPU compositor stuck without repainting, leaving the window fully white until the user force-quits the app. The renderer process stays alive the whole time, so the existing render-process-gone crash handler never fires.
• Listens for Electron's powerMonitor resume event and nudges the window size by a pixel to force the native compositor to redraw. No webContents.reload() and no loss of in-progress renderer state.

Test plan

• npm run build — compiles cleanly
• npm run lint — 0 errors (pre-existing warnings only, unrelated to this change)
• Manual: put a MacBook running FloCafe to sleep and wake it, confirm the window repaints instead of staying white

🤖 Generated with Claude Code

[greptile-apps]

Greptile Summary

The PR adds a system-resume recovery hook intended to repaint a white Electron window without reloading renderer state.

• Registers one powerMonitor resume listener during application initialization.
• After resume, briefly changes the visible window width and restores it to prompt compositor redraw.

Confidence Score: 5/5

The PR appears safe to merge because no blocking failure remains in the established scoring set.

No blocking failure remains.

Important Files Changed

Filename	Overview
main/index.ts	Adds the one-time power-monitor listener and guarded resize-based repaint recovery; no follow-up-eligible issue was identified.

_{Reviews (2): Last reviewed commit: "fix: force repaint on system resume to p..." | Re-trigger Greptile}