fix(web): support spaces in composer file mentions

[GuilhermeVieiraDev]

What Changed

Fixed composer file mentions for files and folders whose paths contain whitespace.

The composer now serializes paths with spaces as quoted mention tokens, while leaving simple paths unchanged:

• @src/index.ts
• @"My File.md"

Quoted tokens are parsed back into a single mention chip, and the chip still shows the clean filename without quotes.

Fixes #2571.

Why

The previous mention parser treated a mention as @ followed by non-whitespace characters. That worked for paths like @AGENTS.md, but broke for paths containing spaces.

Selecting MY FILE.md inserted @MY FILE.md , and on re-parse only @MY became a mention while FILE.md stayed as plain text. This was visible in the composer and could also send an incomplete file reference to the agent.

Quoting only paths that need it keeps the common representation backwards-compatible and readable, while giving whitespace-containing paths a clear token boundary.

UI Changes

Before:

After:

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

Medium Risk
Moderate risk because it changes mention token parsing/serialization and cursor mapping logic, which can affect editor selection behavior and the on-wire prompt text for mentions with special characters.

Overview
Adds support for quoted file mention tokens so paths with whitespace (and quotes/backslashes) can be inserted and re-parsed as a single @ mention (e.g. @"My File.md").

Introduces serializeComposerMentionPath and updates mention rendering/insertion (ComposerPromptEditor text content and ChatComposer path completion) plus cursor expand/collapse calculations to use the serialized token length. Updates mention parsing regex to accept quoted tokens with escapes and extends tests to cover quoted mention splitting, unescaping, boundary detection, and cursor mapping.

^{Reviewed by Cursor Bugbot for commit aac0024. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Fix composer file mentions to support paths with spaces

• Adds serializeComposerMentionPath in composer-editor-mentions.ts to quote and escape paths containing whitespace or special characters, producing @"..." tokens.
• Updates the mention regex to recognize both quoted (@"...") and unquoted mention tokens, with proper unescaping of quoted content.
• Updates ChatComposer.tsx and ComposerMentionNode.getTextContent to serialize paths before insertion/rendering.
• Fixes cursor expansion and collapse in composer-logic.ts to account for the extra characters introduced by quoting.
• Behavioral Change: mentions with spaces now serialize as @"path with spaces" instead of @path with spaces, which changes the raw text stored in the composer.

^{Macroscope summarized aac0024.}

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[macroscopeapp]

Approvability

Verdict: Approved

Self-contained bug fix adding quoted path support for file mentions containing spaces. Changes are limited to parsing/serialization logic with comprehensive test coverage and no broader runtime impact.

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[reactreview]

Note

No issues found