Compose(typeahead): Remove text color change on hover.

[nimishmedatwal]

Removes hover effect on compose typeahead which causes it to change text color in dark mode.

Fixes: #29842.

Screenshots and screen captures:

Before	After

Light Mode	Dark Mode

Self-review checklist

• Self-reviewed the changes for clarity and maintainability
  (variable names, code reuse, readability, etc.).

Communicate decisions, questions, and potential concerns.

• Explains differences from previous plans (e.g., issue description).
• Highlights technical choices and bugs encountered.
• Calls out remaining decisions and concerns.
• Automated tests verify logic where appropriate.

Individual commits are ready for review (see commit discipline).

• Each commit is a coherent idea.
• Commit message(s) explain reasoning and motivation for changes.

Completed manual review and testing of the following:

• Visual appearance of the changes.
• Responsiveness and internationalization.
• Strings and tooltips.
• End-to-end functionality of buttons, interactions and flows.
• Corner cases, error conditions, and easily imagined bugs.

[zulipbot]

Hello @zulip/design members, this pull request was labeled with the "design" label, so you may want to check it out!

[timabbott]

What CSS generates the hover effect that you're overriding here? And does this bug affect the light theme?

[nimishmedatwal]

@timabbott

What CSS generates the hover effect that you're overriding here?

This part of code in dark_theme.css generates the hover effect (line 29).

%dark-theme {
    & a:hover {
        color: hsl(200deg 79% 66%);

        & code {
            color: hsl(200deg 79% 66%);
        }
    }

And does this bug affect the light theme?

No, it does not affect the light theme.

[alya]

@timabbott Your question above has been addressed.

[timabbott]

OK. Merged, thanks @nimishmedatwal, though @karlstolley FYI -- that base a tag CSS is probably a thing we should try to move to a CSS variable to reduce its precedence; didn't want to block this on it because it could be thorny, and doesn't seem urgent, but figured the data point would be of interest.