Clean up VerticalTabsSummaryMode feature flag

[warp-for-oss]

Automated cleanup of the VerticalTabsSummaryMode feature flag.

This PR was generated by the feature flag cleanup workflow.

[warp-for-oss]

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[warp-for-oss]

Overview

This PR removes the VerticalTabsSummaryMode feature flag and makes vertical tabs Summary mode unconditional by deleting the Cargo feature, removing the runtime flag bridge and enum variant, and simplifying the affected vertical-tabs UI branches.

Concerns

• No blocking correctness, security, comment-guideline, test-guideline, or spec-drift concerns found in the attached diff.
• Comment audit: the diff does not add or change comments; it only removes the doc comment attached to the removed feature-flag variant.
• Test audit: the diff does not add or change tests. Given this is a cleanup of a default-enabled feature flag with no new independent code path, I did not find a missing-test issue.

Verdict

Found: 0 critical, 0 important, 0 suggestions

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