feat(ui): update context menu

[TheodoreSpeaks]

Summary

Change context menu for copilot/mothership inputs.

• Attachments is now a separate paperclip icon to reduce nested dropdown menu. Now plus icon is exclusively for mothership resources
• @ ing a resource by typing doesn't steal focus but rather continues typing while opening down a minimal search menu fixed above the text input box. This way you can still use the @ symbol without referencing a resource and the text focus doesn't get stolen.

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation
• Other: ___________

Testing

• Tested locally, on copilot, mothership home and task views

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

Screenshots/Videos

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
docs	Skipped		Apr 30, 2026 8:46pm

[TheodoreSpeaks]

@BugBot review

[cursor]

PR Summary

Medium Risk
Moderate UI/UX behavior changes to chat input focus, keyboard handling, and dropdown menu interactions; risk is mainly regressions in mention insertion, navigation, and focus management rather than data/security issues.

Overview
Updates the chat input’s context/plus menu flow by splitting attachments into a dedicated paperclip button and making the + dropdown exclusively for inserting workspace resources.

Adds a new mention-driven resource picker mode: typing @ opens the same dropdown in a non-focus-stealing mode (no search input, filtered by the live mention query, anchored above the input), with new imperative controls (close, moveActive, selectActive) to support Arrow/Tab/Enter selection and correct replacement of the active @... range.

Extends the shared DropdownMenuContent wrapper to expose Radix’s onOpenAutoFocus typing so mention mode can prevent the default focus trap behavior, and includes a small styling tweak to ShortInput to keep selection text transparent.

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[greptile-apps]

Greptile Summary

This PR redesigns the context menu for copilot/mothership inputs: the paperclip attachment action moves to its own standalone Button + Tooltip, and the @ mention trigger no longer steals textarea focus — instead, a floating resource picker appears above the input while typing continues uninterrupted, with keyboard navigation via ArrowUp/ArrowDown/Tab.

• P1 — folder type items are not excluded from the mention-mode filteredItems list (the non-mention view explicitly filters them out), so folders appear as selectable mentions and can be inserted as @FolderName references that the backend parser likely won't resolve.
• P1 — Pressing Enter while the mention dropdown is open and an item is highlighted does not select the mention; it falls through to handleSubmit() and fires the form, which is surprising when a visible selection exists.

Confidence Score: 3/5

Two P1 logic bugs in the new mention flow should be fixed before merging.

Two P1 findings present: folder items leaking into the mention list, and Enter submitting the form while a highlighted mention item is visible. Both affect the primary new feature added in this PR.

plus-menu-dropdown.tsx (folder filter in mention mode) and user-input.tsx (Enter key handling in mention block)

Important Files Changed

Filename	Overview
apps/sim/app/workspace/[workspaceId]/home/components/user-input/components/plus-menu-dropdown.tsx	Reworked to support mention mode: adds isMention state, exposes close/moveActive/selectActive via imperative handle, hides the search input in mention mode, and prevents Radix focus-trap on open. Two issues: folder items aren't excluded from the mention-mode filtered list, and the type cast on DropdownMenuContent props spread is unnecessary.
apps/sim/app/workspace/[workspaceId]/home/components/user-input/user-input.tsx	Major refactor: removes the DOM-mirror caret-anchor helper, introduces mentionRangeRef/mentionQuery state, adds syncMentionState to track live mention ranges, and moves the paperclip into a standalone Button + Tooltip. The Enter key is not intercepted while the mention dropdown is open, causing form submission instead of mention selection.
apps/sim/app/workspace/[workspaceId]/home/components/user-input/components/constants.ts	Extends PlusMenuHandle interface with close, moveActive, and selectActive to support the new imperative control surface — clean additive change.
apps/sim/app/workspace/[workspaceId]/w/[workflowId]/components/panel/components/editor/components/sub-block/components/short-input/short-input.tsx	One-line CSS fix: adds selection:text-transparent to prevent visible text selection highlights in the transparent-text overlay input.
apps/sim/components/emcn/components/dropdown-menu/dropdown-menu.tsx	Surfaces the undocumented Radix onOpenAutoFocus prop via a local DropdownMenuContentProps extension; the type cast that strips it back when spreading is redundant and slightly misleading.

Sequence Diagram

sequenceDiagram
participant U as User (textarea)
participant UI as UserInput
participant PM as PlusMenuDropdown
U->>UI: type "@foo"
UI->>UI: handleInputChange -> syncMentionState
UI->>UI: mentionRangeRef = {start, end}
UI->>PM: open(anchor, {mention: true})
PM->>PM: isMention=true, onOpenAutoFocus prevented
Note over PM: Focus stays in textarea
U->>UI: ArrowDown / ArrowUp
UI->>PM: moveActive(+-1)
PM->>PM: setActiveIndex
U->>UI: Tab
UI->>PM: selectActive()
PM->>UI: onResourceSelect({type, id, title})
UI->>UI: replace mentionRange with @Title
UI->>UI: mentionRangeRef=null, setMentionQuery(null)
U->>UI: Enter (no mention guard)
UI->>UI: handleSubmit() -- dropdown still open!
U->>UI: Paperclip button click
UI->>UI: handleFileSelectStable()

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Cursor Bugbot has reviewed your changes and found 1 potential issue.

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