VS Code-Style Resizable Sidebar #457

Replace percentage-based panels with a custom ResizableSidebar component
Use pixel-based widths (250px default, 200-500px range) for consistent sizing
Implement drag-to-resize with mouse events like VS Code
Add wider invisible drag handle (12px) for easier resize targeting while keeping thin visible indicator

Multiple Terminal Tabs #452

Fixed a regression that prevented creating new terminal tabs. The "New Terminal" button now creates new tabs again instead of just activating existing ones. Multiple tabs can be created per workspace for parallel workflows.

Port Visibility #462

Ports panel

Auto-detects listening ports from terminal output and verifies activity before showing
New Ports panel in the sidebar showing ports grouped by workspace with quick actions (open in browser, jump to pane)
Real-time updates via subscriptions so the list stays current as ports appear/disappear
Cleans up port entries when terminal panes close to avoid stale items

Multi-line URL Links #467

Extract multi-line spanning logic into a shared MultiLineLinkProvider base class
Create UrlLinkProvider that supports URLs spanning wrapped terminal lines
Replace WebLinksAddon with the new custom provider for consistent multi-line handling