Clarify Codex skill invocation hint in the composer

[ZeuxMD]

What Changed

Updated the web composer placeholder copy to explicitly mention that Codex users can type $ in the message box to mention skills.

The hint is only shown for Codex so Claude threads keep their existing copy.

I also extracted the placeholder strings into small helpers and added focused tests for the Codex and non-Codex variants.

Why

T3 Code already supports passing raw prompt text through to Codex, but the composer UI only advertised @ mentions and / commands.

That makes skill invocation easy to miss. This keeps the change small and local while clarifying the supported syntax in the place users actually type it.

UI Changes

Before (Codex new/disconnected thread):

• Ask for follow-up changes or attach images

After (Codex new/disconnected thread):

• Ask for follow-up changes, type $ to mention skills, or attach images

Before (Codex connected/default composer state):

• Ask anything, @tag files/folders, or use / to show available commands

After (Codex connected/default composer state):

• Ask anything, @tag files/folders, type $ to mention skills, or use / to show available commands

No motion or interaction behavior changed.

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

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Note

Low Risk
Low risk: UI copy-only change gated by provider (codex) plus small helper extraction; no message dispatching or state logic is modified.

Overview
Updates the chat composer placeholder text to explicitly advertise $ skill invocation for Codex (both default and disconnected phases), while keeping non-Codex providers’ placeholder copy unchanged.

Extracts the placeholder strings into buildDefaultComposerPlaceholder / buildDisconnectedComposerPlaceholder helpers in ChatView.logic, updates ChatView to use them, and adds focused unit tests to lock in the provider-specific copy.

^{Written by Cursor Bugbot for commit f98b001. This will update automatically on new commits. Configure here.}

Note

Show skill invocation hint in composer placeholder for Codex provider

Adds provider-aware placeholder text to the composer input in ChatView.tsx. Two new utility functions, buildDefaultComposerPlaceholder and buildDisconnectedComposerPlaceholder in ChatView.logic.ts, return a placeholder that includes "type '$' to mention skills" when the provider is codex, and the previous placeholder text for all other providers.

^{Macroscope summarized f98b001.}

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