fix: dark mode (Stopwatch, Category Builder)

[BelKed]

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• Fixes https://github.com/ActivityWatch/aw-webui/issues/519
• Closes https://github.com/ActivityWatch/aw-webui/pull/542

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:rocket: This description was created by Ellipsis for commit 220d65a74057ebe019e1bc51d468e940da6201e5

Summary:

This PR enhances dark mode support by fixing UI inconsistencies in the Stopwatch and Category Builder components.

Key points:

• Added .stopwatch-entry class in StopwatchEntry.vue for dark mode hover effect.
• Added .category-builder-word class in CategoryBuilder.vue for hover effect and table border color adjustments.
• Updated dark.css to include styles for new classes and adjusted existing styles for better dark mode support.

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Generated with :heart: by ellipsis.dev

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 25.60%. Comparing base (9896601) to head (80384ac). Report is 42 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #570 +/- ## ========================================== + Coverage 25.54% 25.60% +0.06% ========================================== Files 27 27 Lines 1617 1613 -4 Branches 273 286 +13 ========================================== Hits 413 413 + Misses 1178 1174 -4 Partials 26 26 ```

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