[9ef46be7] feat(prompter): implement Prompter page, nav entry, chat UI, and task creation wiring (#78) (#79)

- Add Task Assistant nav entry (Sparkles icon) to sidebar between Kanban and Projects
- Create lib/api/prompter.ts with createSession, sendMessage, getDraft API functions
- Create hooks/use-prompter.ts with 6-state machine (empty→chatting→draft_preview→review_modal→launching→success)
- Create ChatMessages with auto-scroll, user/assistant/error rendering, inline DraftProposalCard
- Create ChatComposer with Enter-to-send and Shift+Enter for newline
- Create DraftProposalCard with title, description, acceptance criteria, metadata badges, Keep Chatting/Review & Confirm actions
- Create ConfirmDialog (Radix Dialog, no form element) with MarkdownEditor, AcceptanceCriteriaEditor, metadata selects, warning banner, disabled Confirm & Launch until valid
- Create SuccessCard with task title, team, View Task link, Start Another button
- Create /prompter route page composing all components via usePrompter hook
- TypeScript and ESLint pass with zero errors

Co-authored-by: Frontend Developer 2 <fe-dev-2@agents.roboco.dev>

panel/src/components/layout/sidebar.tsx

@@ -21,6 +21,7 @@ import {
   GitBranch,
   Database,
   Cpu,
+  Sparkles,
 } from "lucide-react";
 import { Button } from "@/components/ui/button";
 import { ScrollArea } from "@/components/ui/scroll-area";
@@ -33,6 +34,7 @@ const navItems = [
   // Work Management
   { title: "Tasks", href: "/tasks", icon: ListTodo },
   { title: "Kanban", href: "/kanban", icon: Kanban },
+  { title: "Task Assistant", href: "/prompter", icon: Sparkles },
 
   // Development
   { title: "Projects", href: "/projects", icon: FolderGit2 },