feat: allow selecting images using cmd+a

[uinstinct]

Description

Allow selecting images using cmd/ctrl+a.

resolves CON-5056

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Checklist

• [] I've read the contributing guide
• [] The relevant docs, if any, have been updated or created
• [] The relevant tests, if any, have been updated or created

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before.mp4

after.mp4

Tests

[ What tests were added or updated to ensure the changes work as expected? ]

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Summary by cubic

Enable Cmd/Ctrl+A to select all content in the TipTap editor, including images, with a clear outline on selected images. Resolves CON-5056.

• New Features
  • Override Mod-a to select the full document (text and images).
  • Add selection decorations for image nodes and a .selected-image CSS outline for visual feedback.

^{Written for commit e31605a. Summary will update automatically on new commits.}

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[cubic-dev-ai]

No issues found across 2 files

[RomneyDa]

Looks good!