fix: show hover actions on touch devices

[matt2e]

Summary:

• Make comment, reference, image, message, and timeline hover actions available on touch/coarse-pointer devices.
• Preserve keyboard accessibility by revealing hidden actions on focus.

Tests:

• Push hooks ran crates-fmt, crates-lint, crates-test, staged-ci, and differ-ci.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Include secondary coarse pointers

This media query only matches when the primary pointer is coarse or the primary input cannot hover. On hybrid devices such as touchscreen laptops/Surfaces with a mouse or trackpad as the primary input, users can still tap the UI but (pointer: coarse) and (hover: none) are false, so these controls remain opacity: 0 and the touch problem persists here and in the repeated media blocks. Use any-pointer: coarse/any-hover: none if the goal is to support any touch-capable input.

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