docs(FN-2063): refresh dashboard guide screenshots

- Replace outdated dashboard screenshots across the guide and demo asset
- Add new view screenshots for chat, documents, list, mailbox, memory, nodes, roadmaps, and skills
- Update docs/dashboard-guide.md to reference the new visuals for current UI flows

docs/dashboard-guide.md

@@ -29,6 +29,20 @@ Features:
 - Duplicate task actions
 - Quick scanning of metadata without card expansion
 
+![List view](./screenshots/list-view.png)
+
+## Chat View
+
+Chat view provides project-scoped conversations with agents.
+
+![Chat view](./screenshots/chat-view.png)
+
+## Mailbox View
+
+Mailbox view shows inbox/outbox communication threads and unread state.
+
+![Mailbox view](./screenshots/mailbox-view.png)
+
 ## Interactive Terminal
 
 Fusion embeds a terminal using xterm.js.
@@ -64,6 +78,8 @@ Features:
 - Open files in an editor with syntax highlighting
 - Navigate artifacts generated during task execution
 
+![Documents view](./screenshots/documents-view.png)
+
 ## Activity Log
 
 The activity log tracks task/system events over time.
@@ -174,6 +190,8 @@ Manage mission hierarchy and progression state.
 
 Roadmaps provide a dedicated planning surface for organizing product development with hierarchical milestones and features.
 
+![Roadmaps view](./screenshots/roadmaps-view.png)
+
 ### Creating Roadmaps
 
 1. Click the **+** button in the Roadmaps sidebar to create a new roadmap
@@ -322,6 +340,12 @@ Roadmaps can be exported as structured data for use in mission and task planning
 - Copy individual feature handoffs as task planning prompts
 - Preserve roadmap context when creating tasks in the task board
 
+## Memory View
+
+Memory view provides a multi-file editor for project and daily memory files.
+
+![Memory view](./screenshots/memory-view.png)
+
 ## Task Detail Modal
 
 Inspect logs, step progress, workflow outcomes, and model overrides.
@@ -332,6 +356,8 @@ Inspect logs, step progress, workflow outcomes, and model overrides.
 
 The Node Dashboard provides a mesh view of connected Fusion nodes. Each node can be a local instance or a remote headless node (`fn serve`).
 
+![Nodes view](./screenshots/nodes-view.png)
+
 ### Local/Remote Node Switching
 
 When remote nodes are available, the dashboard header displays a node status indicator:
@@ -375,6 +401,8 @@ The selected node persists across browser sessions via localStorage. If the sele
 
 The Skills API provides endpoints for managing execution skills. Skills are toggled via project-scoped settings in `.fusion/settings.json`.
 
+![Skills view](./screenshots/skills-view.png)
+
 ### GET /api/skills/discovered
 
 List all discovered skills with their enabled state.