Merge main's pin into the terminal-size presence branch (follow-up to #259)

[lawrencecchen]

cmux #15203 now pins bonsplit 83857fa, a merge of bonsplit 287e473 (the pin on cmux main) into feat/terminal-size-presence after #259 merged. Merging this with a merge commit makes 83857fa an ancestor of bonsplit main, as the submodule pointer rule requires.

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Summary by cubic

Merges main's cmux pin into the terminal-size-presence branch, keeping the pinned bonsplit commit an ancestor of bonsplit main as the submodule pointer rule requires. Also carries over the pinned main changes.

• Split buttons can now be hover-only outside minimal mode via splitButtonsOnHover.
• Tab text and shortcut-hint pills pick dark or light chrome by WCAG contrast instead of a simple luminance cutoff, so saturated mid-tone backgrounds get readable text.

^{Written for commit 83857fa. Summary will update on new commits.}

Summary by CodeRabbit

• New Features

  • Added an option to show split buttons on tab-bar hover in standard mode. Hover-only buttons overlay the tab bar without reserving space; always-visible buttons reserve a lane.
  • Shortcut hints now adapt their colors to the tab bar’s light or dark appearance.

• Bug Fixes

  • Improved active text color choices for custom tab-bar backgrounds to support more readable contrast across a wider range of colors.

• Documentation

  • Clarified how hover-only split buttons appear and compare with minimal mode.

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Reviewing files that changed from the base of the PR and between ee1500c and 83857fa.

📒 Files selected for processing (6)

• Sources/Bonsplit/Internal/Styling/TabBarColors.swift
• Sources/Bonsplit/Internal/Views/TabBarView.swift
• Sources/Bonsplit/Internal/Views/TabItemView.swift
• Sources/Bonsplit/Public/BonsplitConfiguration.swift
• Tests/BonsplitTests/BonsplitTests.swift
• Tests/BonsplitTests/TabBarTextSchemeTests.swift

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