Font enhancements in dark mode

[nandinisri1912]

Summary [required]

This PR updates font colors in dark mode to improve readability and visual consistency across the UI. The changes are limited to styling only and do not affect application logic or functionality. The goal was to make text easier to read in dark mode by adjusting color usage in the relevant components/pages.

Related Issue [required]

Closes #1158

Type of Change [required]

• Bug fix — resolves a broken behaviour
• Feature — adds new functionality
• Data — adds new projects to data/projects.json
• Documentation — updates docs, README, or code comments only
• Style — CSS or visual changes only, no logic change
• Refactor — restructures code without changing behaviour
• Test — adds or updates tests

What Was Changed [required]

File	Change made
utils/recommender.py	Added clear_cache() function
tests/test_basic.py	Added test for cache invalidation

How to Test This PR [required]

• Checkout this branch: git checkout style/dark-mode-font-colors

• Install dependencies: pip install -r requirements.txt

• Run the app locally.

• Switch to/use dark mode.

• Visit the pages/components affected by this PR and verify the updated text colors are visible, readable, and consistent.

Run the test suite:

python tests/test_basic.py

Expected test output:

27 passed, 0 failed out of 27 tests

Test Results [required]

Screenshots (if UI change)

Before	After
screenshot	screenshot
Unable to procure screenshot

Self-Review Checklist [required]

• I have read CONTRIBUTING.md and followed all guidelines
• My branch name follows the convention: feat/, fix/, docs/, data/, style/, test/
• I have run python tests/test_basic.py and all 27 tests pass
• I have run flake8 . locally and there are no errors
• I have not introduced any print() or console.log() debug statements
• Every new function I wrote has a docstring
• I have not modified files outside the scope of the linked issue
• If I changed the UI, I tested it at 375px (mobile) and 1280px (desktop)
• If I added a project to the dataset, it has all required JSON fields

Notes for Reviewer

While working on this task, I also spent some time investigating a few related UI issues. Since I was not able to fully resolve those yet, I have kept this PR limited to the dark mode font/text color changes that are complete and tested so far.

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[komalharshita]

@nandinisri1912 kindly resolve the merge conflicts

[komalharshita]

Thanks for your contribution :)

[nandinisri1912]

Thank you for helping me contribute:))