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* feat: add persona picker and @ mention support in chat Replace the provider-first model with a persona-first interaction pattern. Users now pick a Persona (with its own system prompt, default provider, and model) from a dropdown in both the home screen and chat input. Typing @ in the chat textarea opens an autocomplete to mention any persona inline, switching context for that message. Provider selection is still available as a secondary override. New components: - PersonaPicker: dropdown grouped by built-in / custom personas - MentionAutocomplete: floating autocomplete triggered by @ in textarea - ChatInputToolbar: extracted bottom bar to keep ChatInput under 500 lines - useMentionDetection: hook for detecting @ mention state in text input Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * feat: wire persona system prompts through to ACP backend and fix mention UX - Pass persona system_prompt from frontend through Tauri to AcpService - Prepend persona instructions to user prompt in <persona-instructions> tags - Add keyboard navigation (arrow keys, Enter/Tab) to @ mention autocomplete - Fix PersonaPicker description extraction (was using index [1] instead of [0]) - Simplify ChatView handleSend by letting useChat handle system prompt injection Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * feat: enhance persona picker with @ mentions on home screen, switch notifications, and per-message persona tracking Adds @ mention autocomplete to the HomeScreen input so users can invoke personas before starting a chat. Shows system notifications when switching personas mid-chat, and tracks which persona generated each assistant message in the timeline. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * fix: persist persona selection across tab switches and app restarts Store the selected persona per session in ui_state.json alongside the existing tab state. When switching tabs or reopening the app, the previously selected persona is restored for each chat session. Changes: - Backend: add persona_per_session HashMap to UiState with serde(default) for backward compatibility - chatSessionStore: add personaId to ChatSession, save/restore persona mapping in persistTabState/loadTabState - ChatView: save persona changes to session store - AppShell: pass session's stored personaId to ChatView, store personaId when creating new sessions Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * fix: resolve 4 bugs found in persona picker audit 1. Error state stuck: acpSendMessage errors now reset chatState to "idle" so the user can continue sending messages after failures. 2. Stop button cancels backend: stopGeneration now calls acp_cancel_session to terminate the Rust ACP session, preventing orphaned streaming events after the UI resets. 3. @ mention persona race condition: when switching personas via @ mention, the message send is deferred to the next render cycle so useChat picks up the new persona's system prompt instead of the stale one. 4. Deleted persona fallback: if a persisted personaId references a deleted persona, ChatView now falls back to builtin-goose (or the first available persona) and updates the session store. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * fix: load personas eagerly at app startup Personas were only loaded when visiting the Personas page (via the usePersonas hook in AgentsView). This meant the persona picker in HomeScreen and ChatInput showed empty until the user navigated to the Personas page at least once. Now AppShell loads personas from the backend in its startup effect, alongside sessions and tab state. This ensures personas are available immediately in all views. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * style: fix cargo fmt in acp service Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * fix: update tests for persona picker changes and silence clippy - Update ChatInput tests for new toolbar structure and persona props - Update HomeScreen tests to mock persona store instead of ACP providers - Add #[allow(clippy::too_many_arguments)] on send_prompt Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>