Add some ESLint rules + minor changes (#3665)

Main point was to enable ESLint `dot-notation` and `no-unneeded-ternary`
rules for more code consistency.

I took the occasion to add two minor commits:
- Fix a problem found by running `test:spelling
- Minor dependency update

It wouldn't be a problem if the PR didn't arrive in the next release,
the changes are cosmetic.

package.json

@@ -76,10 +76,10 @@
 		"module-alias": "^2.2.3",
 		"moment": "^2.30.1",
 		"node-ical": "^0.20.1",
-		"pm2": "^5.4.2",
+		"pm2": "^5.4.3",
 		"socket.io": "^4.8.1",
 		"suncalc": "^1.9.0",
-		"systeminformation": "^5.23.23",
+		"systeminformation": "^5.23.24",
 		"undici": "^7.2.0"
 	},
 	"devDependencies": {