search ui: follow up search result items improvements (!38900) · Merge requests · Administrator / sourcegraph

Created by: limitedmage

Follow up to #38785

Removes hacky overflow: hidden properties on the search results page, instead relying on grid's minmax to prevent horizontal scrolling. This is necessary so sticky positioning works.
Made the header of search results sticky so it stays at the top of the screen while scrolling
Made the collapse button of the search results sticky so it stays at the bottom of the screen while scrolling
Fixed the flash of content when expanding/collapsing search results when the core workflow improvements are enabled
- Also fixed the text color of placeholder line numbers to match the color of loaded line numbers
Fixed the repo result text color so it matches the other result types when the core workflow improvements are enabled

Test plan

Test manually with feature flag on and off. No changes should occur in visual tests.