Webapp v11.4.0

This release adds an experimental Context Lens for hosted Tlonbot users to inspect agent tool calls and model responses, along with reaction notifications, the channel host on Channel Info, and a video download button. Fixes address reaction tooltips missing nicknames, failed role assignments, and more.

• Adds an experimental "Context Lens" feature for hosted users using Tlonbot. Enable this feature in "Experimental Settings," then tap the new button below your bot's replies to inspect the details of its agent tool calls, model response, and other critical details for debugging.
• Adds support for sending notifications for when others react to your posts.
• Adds the channel host on the Channel Info screen.
• Adds a download button to the video player lightbox to download.
• Fixes an issue where reaction tooltips were too skinny and lacked contact nicknames.
• Fixes an issue where assigning a role in a group would fail.
• Fixes an issue where third-party clients would insert illegal emoji reaction shortcodes.
• Fixes an issue where 'Mark as Read' would fail.
• Fixes an issue where clicking on an Activity item would fail to navigate to an originating thread.
• Fixes an issue where invite links would show the bare user ID and fallback group title.