Detect if device is in dark mode or not

[diadal]

What kind of change does this PR introduce?

• Bugfix
• [* ] Feature
• Documentation
• Code style update
• Refactor
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change?

• Yes
• [ *] No

The PR fulfills these requirements:

• [dev ] It's submitted to the dev branch (or v[X] branch)
• When resolving a specific issue, it's referenced in the PR's title (e.g. fix: #xxx[,#xxx], where "xxx" is the issue number)
• It's been tested on a Cordova (iOS, Android) app
• It's been tested on an Electron app
• Any necessary documentation has been added or updated in the docs or explained in the PR's description.

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature (to avoid wasting your time, it's best to start a new feature discussion first and wait for approval before working on it)

Other information:

this helps to know if the device is in dark mode or not

[yusufkandemir]

Adding @rstoenescu's comment from here:
https://github.com/quasarframework/quasar/pull/17670/changes#r1865970342

There is no matchMedia here, nor can it be. This code runs on the server. It should be defaulted to a value (probably false) and updated only on client takeover, otherwise there will be hydration errors.