Bug bash fixes: Msgextension cardbutton clicked, onsetting added, activity preview fix, SSO status reconciliation

[MehakBindra]

This pull request introduces significant improvements and new features to the MessageExtensionBot sample, streamlines configuration for several other samples, and enhances code maintainability and clarity. The most notable changes include the addition of a working message extension settings flow (with UI and manifest updates), improved adaptive card actions, and the migration of sensitive configuration from environment variables to appsettings for better local development experience.

Message Extension Settings & Actions

• Added a static settings page (wwwroot/settings.html) for message extension configuration, with Teams SDK integration for saving/cancelling settings.
• Implemented the OnQuerySettingUrl and OnSetting handlers in Program.cs to support opening and saving extension settings, including proper manifest and domain configuration. [1] [2] [3] [4] [5]
• Updated manifest guidance and documentation to clarify canUpdateConfiguration placement and required validDomains for settings. (F2f34638L2R2, [1] [2]

Adaptive Card and Action Improvements

• Added a "View Details" button (OpenUrlAction) to adaptive cards in CreateSelectItemCard, and handled card button clicks in the bot with the new OnCardButtonClicked handler. [1] [2]
• Refactored adaptive card response creation to remove unused parameters and simplify usage. [1] [2]

Configuration and Environment Variable Migration

• Moved OpenAI and bot configuration from environment variables to appsettings/launch settings for ObservabilityBot, ExtAIBot, and McpServer samples, and updated documentation accordingly. [1] [2] [3] [4] [5] [6] [7] [8]

Codebase and Documentation Cleanup

• Updated and clarified README files for multiple samples to reflect new configuration patterns and manifest requirements, and removed redundant or outdated setup instructions. [1] [2] [3] [4] [5] [6]

Other Enhancements

• Improved helper method type safety for extracting preview card data. [1] [2]
• Enabled static file serving for the settings page in the bot web app.

These changes collectively make the samples more robust, easier to configure, and better aligned with Teams extensibility best practices.

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[Copilot]

Pull request overview

Bug-bash updates across core SDK and sample bots to align configuration with AzureOpenAI__* conventions, improve ObservabilityBot telemetry wiring, and fix OAuth/SSO connection status reporting.

Changes:

• Updated sample configuration/docs to use AzureOpenAI__{Endpoint,ApiKey,Deployment} (and ConnectionStrings__AppInsights) instead of legacy env var names.
• Enhanced Context.GetConnectionStatusAsync to reconcile GetTokenStatus results with per-connection GetTokenAsync to address silent SSO status mismatches.
• Simplified token status array construction in UserTokenClient.GetTokenStatusAsync using collection expressions.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
core/src/Microsoft.Teams.Core/UserTokenClient.cs	Simplifies GetTokenStatusAsync return construction using collection expressions.
core/src/Microsoft.Teams.Apps/Context.cs	Reconciles token status with per-connection token retrieval to improve SSO status accuracy.
core/samples/StreamingBot/README.md	Updates sample setup docs to the AzureOpenAI__* config format.
core/samples/StreamingBot/Properties/launchSettings.TEMPLATE.json	Removes legacy AZURE_OPENAI_* env vars from the template.
core/samples/StreamingBot/Program.cs	Reads Azure OpenAI settings from AzureOpenAI:* configuration keys.
core/samples/ObservabilityBot/README.md	Updates prerequisites/export-target docs and config key names.
core/samples/ObservabilityBot/Properties/launchSettings.TEMPLATE.json	Switches App Insights and Azure OpenAI settings to config-style keys.
core/samples/ObservabilityBot/Program.cs	Wires Azure Monitor exporter connection string via ConnectionStrings:AppInsights and updates Azure OpenAI config reads.
core/samples/ObservabilityBot/ObservabilityBotApp.cs	Uses injected IConfiguration to fetch deployment name (instead of env var).
core/samples/GraphBot/README.md	Removes local config section from the GraphBot sample docs.
core/samples/ExtAIBot/README.md	Updates Azure OpenAI configuration documentation formatting/keys.
core/samples/CustomHosting/README.md	Minor README formatting tweak.

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