fix(ui): make punctuation hotkeys layout-independent

[DustyShoe]

Summary

Fix punctuation-based hotkeys in invokeai/frontend/web so they use layout-independent physical key identifiers instead of layout-dependent characters. This keeps canvas tool width shortcuts and related punctuation bindings working when a non-English keyboard layout is active. The change centralizes hotkey normalization and display formatting, canonicalizes legacy persisted bindings, and adds focused test coverage.

Also stabilize a flaky timeout assertion in invokeai/frontend/web/src/features/ui/layouts/navigation-api.test.ts so the required frontend build passes reliably under full-suite load.

Related Issues / Discussions

N/A

QA Instructions

1. Open the canvas with a non-English keyboard layout active.
2. Select the brush or eraser tool.
3. Press the physical [ and ] keys and confirm the tool width changes.
4. Open the hotkeys modal and confirm the bindings still display as [ and ].

Merge Plan

None.

Checklist

• The PR has a short but descriptive title, suitable for a changelog
• Tests added / updated (if applicable)
• ❗Changes to a redux slice have a corresponding migration
• Documentation added / updated (if applicable)
• Updated What's New copy (if doing a release after this PR)