color-text-maxcontrast needs to use darker value in new left navigation

[jancborchardt]

Since the new left navigation is slightly transparent, we need to use a slightly darker --color-text-maxcontrast value when it’s used in there.

To be clear: Only for the usage in there, we should not increase the value of the variable overall, as then it will reduce the contrast/difference to --color-main-text.

Of course there are different backgrounds, but let’s start out by making sure it works for the default background.

With current #767676 (maxcontrast) for subline	With better #646464

---

Also, .line-two__subtitle uses the outdated variable var(--color-text-lighter) – we only use --color-main-text and --color-text-maxcontrast, as per the design guidelines: https://docs.nextcloud.com/server/latest/developer_manual/design/foundations.html#text-color

[jancborchardt]

@juliushaertl @CarlSchwan we should ideally fix this for the release as it relates to the accessibility of a very prominent element. What do you think of the proposal?

[jancborchardt]

cc @AndyScherzinger

[AndyScherzinger]

Sounds good to me 👍
Also the change is very subtle - thus not impacting screenshots

[Pytal]

This uses server-side calculated color variables so splitting up calculations with new client-side logic wouldn't be an option, seems that adding a new variable would be the way to go then @skjnldsv?

Would mean replacing --color-text-lighter in NcListItem with the new variable