feat: complete qpwgraph feature parity
Core Visual Routing:
- Dashed lines for inactive connections (unpinned shown dimmer)
- Color-coded streams (audio=green, midi=red, video=blue)
- Pin indicator (yellow dot) on pinned connections
Patchbay - Session Management:
- Save & Restore: named profiles stored on server (~/.config/pwweb/patchbay.json)
- Activated Mode: toggle to auto-restore connections when apps appear
- Exclusive Mode: enforce profile-only links, disconnect everything else
- Pin & Unpin: right-click wire -> Pin/Unpin, yellow dot on pinned wires
- Auto-Pin: automatically pin all new manual connections
- Auto-Disconnect: auto-sever pinned connections when patchbay deactivated
- Rule Management: dialog showing all profile rules with type badges
Graph Customization:
- Node Hiding: add regex patterns to hide nodes (e.g. Dummy|Freewheel)
- Node Merging: merge nodes sharing a common prefix into one block
- All rules persisted to server with the patchbay state
Dialogs: Hide Nodes, Merge Nodes, Profiles, Rules
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