Fix accessibility: Add accessible names to refresh buttons in Connection Dialog

[Copilot]

This PR fixes an accessibility issue where refresh buttons in the Connection Dialog lacked accessible names, violating WCAG 4.1.2 (Name, Role, Value) guidelines.

Problem

Screen readers could not identify the refresh buttons in both the "Saved Connections" and "Recent Connections" sections of the Connection Dialog, leading to poor user experience for users with disabilities.

Solution

Added proper accessible names to the refresh buttons by:

1. Adding localized refresh string in src/reactviews/common/locConstants.ts:

   refresh: l10n.t("Refresh"),

2. Adding title attributes to both refresh buttons in src/reactviews/pages/ConnectionDialog/connectionsListContainer.tsx:

   <Button
       icon={<ArrowClockwise16Filled />}
       appearance="subtle"
       onClick={context.refreshConnectionsList}
       title={locConstants.connectionDialog.refresh}
   />

Impact

• ✅ Screen readers now properly announce "Refresh" when focusing on these buttons
• ✅ Meets WCAG 4.1.2 accessibility compliance requirements
• ✅ Maintains consistency with existing accessibility patterns in the codebase
• ✅ Minimal code changes with no functional impact

Testing

• All TypeScript compilation passes
• React views build successfully
• ESLint validation passes
• Localization system properly integrated

Fixes #18653.

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