fix(#287): clear focus mode polling on app quit

[Shreya-nipunge]

Description

Adds Focus Mode polling cleanup to the Electron before-quit handler.

Previously, stopFocusModePolling() was only called from window-all-closed, so Focus Mode polling could remain active during shutdown paths such as quitting from the tray or overlay context menu.

Related Issue

Fixes #287

Changes Made

• Added stopFocusModePolling() to the before-quit cleanup path.
• Preserved the existing window-all-closed Focus Mode cleanup.
• Kept the change scoped to main.js.

Testing

• git diff
• git diff --check
• npm.cmd test — passed (14/14 tests)
• npm.cmd pkg get scripts — confirmed no lint script is available

[vercel]

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