fix(vscode-webui): refine i18next ESLint rules to reduce false positives

[ZHallen122]

Summary

This PR refines the i18next ESLint configuration for the vscode-webui package to significantly reduce false positives while maintaining effective internationalization coverage:

• Changed mode from jsx-text-only to jsx-only to enable targeted attribute checking
• Added jsx-attributes whitelist to only check user-facing attributes (title, alt, placeholder, label)
• Excluded all function call arguments from validation to reduce noise from technical/developer strings
• Added single letter exclusion pattern for initials
• Added brand name exclusion for "Pochi"

These changes focus the linting on actual user-facing text that needs translation, while ignoring technical attributes like className, variant, size, and developer-oriented function arguments.

Test plan

• All existing tests pass
• ESLint configuration follows the i18next/no-literal-string plugin's documented options
• Changes reduce false positives without compromising i18n coverage of user-facing text

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