Allow +/- to initiate chips on mobile

[paperboyo]

Co-authored by Claude Opus 4.6, description written by a human, 48.

What does this change?

Chips are impossible to add using mobile keyboard. This was verified to work. I checked if it negatively affects desktop, but couldn't find any issues. 🤖 was adamant it’s OK, but they often are.

🤖 says:

Fix: chip trigger (+/-) on mobile virtual keyboards

Mobile virtual keyboards (Android, iOS) often don't fire keydown events with correct event.key values for punctuation — they arrive as key: "Unidentified" or go through composition/input events instead. This means the existing handleKeyDown check for +/- never fires on mobile, making chip creation impossible on touch devices.

Fix

Add handleTextInput plugin prop — ProseMirror's input-method-agnostic hook that fires whenever text is inserted regardless of input mechanism. It calls the same maybeAddChipAtPolarityChar function, so all existing guards (no mid-word triggers, - adjacency check) still apply.

Why it's safe for desktop

On desktop, handleKeyDown catches +/- first and returns true → ProseMirror calls preventDefault() → the text is never inserted → handleTextInput never fires. The new code path is unreachable on desktop keyboards.

How has this change been tested?

All 197 tests pass, 0 failures. Tested on Chrome for Android latest beta.

How can we measure success?

If someone would want to use chips on mobile they will feel instant success.

[github-actions]

Deploy build 508 of deploy::cql-sandbox to CODE

All deployment options

• Deploy build 508 of deploy::cql-sandbox to CODE
• Deploy parts of build 508 to CODE by previewing it first
• What's on CODE right now?

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From guardian/actions-riff-raff.

[github-actions]

Deploy build 508 of cql::cql-lambda to CODE

All deployment options

• Deploy build 508 of cql::cql-lambda to CODE
• Deploy parts of build 508 to CODE by previewing it first
• What's on CODE right now?

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From guardian/actions-riff-raff.

[Copilot]

Pull request overview

Enables chip creation via +/- characters from mobile virtual keyboards, which often don't fire keydown events with reliable event.key values for punctuation. Adds a handleTextInput ProseMirror plugin hook that calls the same chip-creation logic as the existing handleKeyDown path. On desktop, handleKeyDown already preempts the input by returning true, so the new path is only exercised on mobile.

Changes:

• Add handleTextInput to the CQL ProseMirror plugin to detect +/- insertions from input methods that bypass keydown.

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