chore: release v0.5.0

[github-actions]

🤖 New release

• cell-sheet-core: 0.4.0 -> 0.5.0 (⚠ API breaking changes)
• cell-sheet-tui: 0.4.0 -> 0.5.0

⚠ cell-sheet-core breaking changes

--- failure enum_variant_added: enum variant added on exhaustive enum ---

Description:
A publicly-visible enum without #[non_exhaustive] has a new variant.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#enum-variant-new
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.46.0/src/lints/enum_variant_added.ron

Failed in:
  variant HelpCategory:Mouse in /tmp/.tmpOmkO3q/cell/crates/cell-sheet-core/src/help/mod.rs:10

Changelog

cell-sheet-tui

0.5.0 - 2026-05-04

Added

• (tui) mouse support (#70) (#84)

Fixed

• escape quotes and backslashes in .cell format labels (#85)
• (cell-format) surface parse errors for corrupted size/col-width headers (#76) (#83)
• add missing help entries for 0.3.0 viewport, marks, jump-list, etc. (#69)

Other

• extract status manager (#101)
• extract command state (#98)
• automate releases with release-plz (#97)
• extract search state (#95)
• centralize file format policy (#90)
• centralize sheet mutation invariants (#89)
• extract app action dispatch (#88)
• bring README in sync with shipped features

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This PR was generated with release-plz.