fix: fixed the colors misalignment for search

[sphurthy]

Description

Related PRS (if any):

None

Main changes explained:

• Search Filters: section labels (Branches, Themes, Categories, etc.) use a lighter color; dropdown/select text uses a darker color.
• Dark mode: same hierarchy kept (lighter labels, darker select text).
• Date filter: Tomorrow / This Weekend radio buttons fixed so they’re visible and not cut off; “Online only” checkbox unchanged.

How to test:

1. check into current branch
2. do npm install and ... to run this PR locally
3. Clear site data/cache
4. Open /communityportal → All Events.
5. Check that filter labels look lighter than the text in the dropdowns (light and dark mode).
6. Check that “Tomorrow” and “This Weekend” radios are visible and aligned, and that “Online only” still looks correct.

Screenshots or videos of changes:

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud