Theia AI G&A - AI-powered Theia IDE alpha - Release epic

[JonasHelming]

Mandatory topics

• Chat Input is unusable #14924
• Move AI configuration view into ide package #14921
• [Theia AI] Coder switched to attempt tool calls in text like this "Tool Call:" #14905 (Fix tool calling string in messages #14906)
• Remove AIEditorManager #14873 (Remove AIEditorManager #14912)
• [Theia AI] Support DeepSeek reasoner (and future models with special "system" prompt requirements #14867 (Refine system message settings #14877)
• Add Context Support to Chat Requests #14839 (feat(ai): Enable Context Variables for Chat Requests #14787, [Theia AI] Integrate context feature with Coder #14895)
• All Theia AI strings should be translatable #14825 (localize Theia AI strings #14857, Allow to change the ChatViewWidget title in products #14687)
• [Theia AI] Coder and ChangeSet Epic #14768 ([Theia AI] Diff editor does not update to new changes #14900, Improve AI diff UX #14910, Use DiffEditor DiffNavigator to navigate diffs #14889, Update editors when ChangeElement added or replaced #14901, [Theia AI] Run ScanOSS on changeset #14915)
• Feature - Chat Agent Pinning #14716
• Messaging and labeling alpha vs. experimental vs. G&A in code BLOCKED BY localize Theia AI strings #14857
• Rename Workspace agent to architect BLOCKED BY localize Theia AI strings #14857

Very nice to have

• [Theia AI] Persistence for chats
• Listener memory leak in AI system #14902 (Implement asynch iterator for Open AI stream #14920 )
• Enable change navigation in diff editors #14888
• Error: There are no document for untitled:/Untitled-1aichatviewlanguage #14842
• Resolve file context variable for Universal and Workspace
• [Theia AI] Edit user messages
• [Theia AI] Support multi root workspaces in workspace functions, changeset functions and context
• [Theia AI] Repeat last user requests
• Re-Investigate how function calls should remain in the message history
• [Theia AI] Allow multiple replacements in Coder function #14933 (Allow multiple replacements in Coder function #14934)
• Code output from o3-mini language model is not formatted #14846
• Chat view conflicts with vim extension in Theia IDE
• Make Orchestrator more usable | It could mention pinning and shorten requests for classification
• Make universal default prompt plain
• Allow to create new thread and follow-up thread in Coder chat
• [Theia AI] Support prompt fragments #14899

Nice to have

• AI scroll-lock suggestions #14362
• [Theia AI] Tool Calling with OpenAI API Bug/Improvement: Ensure each function has a clear schema #14663
• Allow Coder to search workspace
• Support Gemini API