Add subscript & superscript characters for Quick Accent #41922

[Salehnaz]

Summary of the Pull Request

This PR adds subscript and superscript characters to the "Special Characters" set in Quick Accent. This addresses the request in issue #41922, allowing users to easily type common mathematical notations (e.g., x², H₂O) using the Quick Accent menu.

PR Checklist

• Closes: Subscript & Superscript characters for Quick Accent #41922
• Communication: I've discussed this with core contributors already. If the work hasn't been agreed, this work might be rejected
• Tests: Added/updated and all pass
• Localization: All end-user-facing strings can be localized
• Dev docs: Added/updated
• New binaries: Added on the required places
  • JSON for signing for new binaries
  • WXS for installer for new binaries and localization folder
  • YML for CI pipeline for new test projects
  • YML for signed pipeline
• Documentation updated: If checked, please file a pull request on our docs repo and link it here: #xxx

Detailed Description of the Pull Request / Additional comments

The following Unicode subscript and superscript variants were added to GetDefaultLetterKeySPECIAL in Languages.cs:

• 0: ₀, ⁰, ⁾, ₎
• 9: ₉, ⁹, ⁽, ₍
• A: ᵃ, ₐ
• E: ᵉ, ₑ
• N: ₙ
• X: ˣ, ₓ
• Y: ʸ
• Z: ᶻ
• +: ₌, ⁼ (equals signs)
• -: ₋, ⁻ (minus signs)
• *****: ˣ, ₓ (multiplication sign variants)

Validation Steps Performed

Verified that the Unicode codepoints correspond to the correct subscript and superscript glyphs. This change only modifies the static data list used by Quick Accent and does not alter any logic.

[Salehnaz]

@microsoft-github-policy-service agree

[vanzue]

/azp run

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