fix: #16618

[NanHH]

#16618 (comment)

What kind of change does this PR introduce?

• Bugfix
• Feature
• Documentation
• Code style update
• Refactor
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change?

• Yes
• No

The PR fulfills these requirements:

• It's submitted to the dev branch (or v[X] branch)
• When resolving a specific issue, it's referenced in the PR's title (e.g. fix: #xxx[,#xxx], where "xxx" is the issue number)
• It's been tested on a Cordova (iOS, Android) app
• It's been tested on an Electron app
• Any necessary documentation has been added or updated in the docs or explained in the PR's description.

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature (to avoid wasting your time, it's best to start a new feature discussion first and wait for approval before working on it)

Other information:

[Copilot]

Pull request overview

Adjusts Quasar’s IME/composition handling for masked inputs so that Chromium-based browsers correctly treat numeric keypad input under Chinese IME as an active composition session, preventing premature mask updates that can duplicate the last digit (issue #16618).

Changes:

• Update useKeyComposition to mark qComposing for non-Firefox browsers when compositionupdate carries plain-text (e.data) content (digits/latin), not only CJK characters.
• This causes QInput / QSelect to defer masked input processing until compositionend/change, avoiding mid-composition mask side effects.

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