feat(new-channels): add backspace hotkey for delete + fix full width edit message input

[synoet]

• add hotkey for deleting a message
• fix width on collapsed message inline message editor

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: bbcfb6a3-9195-4053-8560-c556eeecfb2a

📥 Commits

Reviewing files that changed from the base of the PR and between 39c4c20 and e6b21be.

📒 Files selected for processing (5)

• js/app/packages/channel/Channel/InlineMessageEditor.tsx
• js/app/packages/channel/Channel/create-channel-hotkeys.ts
• js/app/packages/channel/Message/ChannelMessage.tsx
• js/app/packages/channel/Thread/create-thread-hotkeys.ts
• js/app/packages/core/hotkey/tokens.ts

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Walkthrough

This pull request extends message and thread reply management by adding delete hotkey functionality and improving component styling. The MessageEditorContent component now accepts an optional class prop for custom styling. Two hotkey condition predicates were renamed to reflect broader usage: canEditSelectedMessageFromHotkey → canEditOrDeleteSelectedMessageFromHotkey and canEditThreadReplyFromHotkey → canEditOrDeleteThreadReplyFromHotkey. New backspace hotkey registrations were added for both channel messages and thread replies, each invoking delete actions when conditions are met. Supporting hotkey tokens channel.deleteMessage and channel.threadDeleteReply were registered.

Poem

🐰 A rabbit hops with joy today,
Delete keys now light the way!
Messages vanish with a tap,
Classes flow through styling's gap,
Hotkeys sing in harmony—
Edit, delete, wild and free! 🌿

🚥 Pre-merge checks | ✅ 1 | ❌ 2

❌ Failed checks (1 warning, 1 inconclusive)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.
Description check	❓ Inconclusive	No pull request description was provided by the author; the description is completely empty.	Provide a description explaining the motivation, implementation details, and any breaking changes or considerations for reviewers.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the two main changes: adding backspace hotkey for delete functionality and fixing full-width edit message input styling.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch synoet/new-channels-backspace-hotkey

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[github-actions]

Preview: https://synoet-new-channels-backspace--rxebim.preview.macro.com/app (1dbcc4c)