keep /goal command highlighted while typing its argument

[kevinjosethomas]

• selecting /goal and pressing space dropped the highlight, leaving it unclear whether the command was still selected, and pressing enter on bare /goal submitted a status message instead of letting you type a goal.
• added a takesArgument flag for commands that take a free-form argument and color the command token inline in the input so it stays highlighted while you type.
• enter on such a command now accepts it and keeps editing, matching how space behaves, rather than submitting immediately.

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Note

Low Risk
UI-only input and autocomplete behavior for specific slash commands; no auth, data, or execution-path changes beyond when Enter submits.

Overview
Improves editing argument-taking slash commands (/goal, /effort, and the thinking alias) so the command stays visually selected and autocomplete does not submit too early.

Adds a takesArgument flag on built-in slash commands plus builtinSlashCommandTakesArgument(), wired through autocomplete items. Choosing such a command from the list no longer submits on Enter—focus stays in the input so you can type the argument (same idea as after space).

The interactive editor passes that metadata into CustomEditor, which overrides styleDisplayText to paint the /command token with the theme accent color while the cursor is past the token. EditorTheme gains optional commandColor (set in the coding-agent theme).

^{Reviewed by Cursor Bugbot for commit 8fa9ed9. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Keep /goal and /effort commands highlighted while typing their arguments

• Adds a takesArgument flag to the /goal and /effort slash commands so the editor and autocomplete can treat them differently from commands that submit immediately.
• When a takesArgument command is selected from autocomplete, the editor no longer auto-submits; it keeps focus so the user can type the argument.
• The command token stays highlighted (using the theme's accent color) while the cursor is positioned after it, implemented via a new styleDisplayText override in custom-editor.ts.
• Behavioral Change: selecting /goal or /effort from autocomplete no longer submits the input — the user must press Enter after typing the argument.

^{Macroscope summarized 8fa9ed9.}

[linear]

ENG-4159 `/goal` command loses selection highlight after space or enter

When /goal is selected in the command input, pressing space removes the highlighting, which makes it unclear whether the command is still selected.

Pressing enter on just /goal currently shows a small silent warning. Expected behavior is to behave like space: insert a space, keep the command highlighting, and allow entering a goal.

Review in Linear