Fix blame page code area not visible at mobile/narrow viewport breakpoints
## Summary At mobile breakpoints, the code area on both the blame page and inline blame view is not visible, preventing horizontal scrolling. This issue exists in production and was identified during the review of !226142. ## Context From [this review comment](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/226142#note_3139678456) by @mle: > **question (non-blocking)** is this known that at mobile breakpoints, you can't see the code area to allow for horizontal scrolling? > > This is something we should fix but since it is also happening in production we can handle this as a follow up. | Blame page | Inline Blame | | ------ | ------ | | ![Blame page at mobile breakpoint](https://gitlab.com/-/project/278964/uploads/089709c884782a3f4a6ae8e06bb2e5e8/CleanShot_2026-03-07_at_11.45.08.png) | ![Inline blame at mobile breakpoint](https://gitlab.com/-/project/278964/uploads/c5713ac9d9584556ad8ea6062af2b417/CleanShot_2026-03-07_at_11.44.55.png) | ## Expected behavior The code area should remain visible and horizontally scrollable at narrow/mobile viewport widths on both the blame page and inline blame view. ## Actual behavior The code area is completely hidden at mobile breakpoints, making it impossible to view or scroll through the code content. ## Steps to reproduce 1. Navigate to any repository file blame view (e.g., `gitlab-org/gitlab-shell/-/blame/main/.golangci.yml`) 2. Resize the browser window to a mobile breakpoint width (< 576px) 3. Observe that the code area is not visible This also reproduces with inline blame: 1. Enable the `inline_blame` feature flag 2. Navigate to any repository file and click "Blame" 3. Resize to a mobile breakpoint 4. Observe the same issue
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