feat: Add polls/file sharing buttons and disableChat config option #16597
      
        
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Summary
Adds dedicated toolbar buttons for polls and file sharing, plus a comprehensive
disableChatconfiguration option.Changes
New Toolbar Buttons
PollsButtonandFileSharingButtonin overflow menudisableChat Configuration
disableChatconfig option (default:false, whitelisted for overrides)getDefaultFocusedTab()to handle dynamic tab fallbackTest Plan
disableChat: truehides chat button and blocks access