Add full container management with templates, terminal, and Claude Code integration

[tylergraydev]

Summary

• Template-first container creation wizard with 9 preconfigured devcontainer templates (Node.js, TypeScript, Rust/Tauri, Python, Go, .NET, Ubuntu, PostgreSQL, Redis) using official Microsoft base images and technology logos
• Full container lifecycle controls — start/stop/restart buttons on cards with live status badges, loading states, and toast notifications for unexpected stops
• Interactive xterm.js terminal (Console tab) with full bash/shell support, tab completion, command history, and auto-resize
• File browser (Files tab) for navigating container filesystems with directory navigation and file metadata
• Git repo cloning on first start via a "Repository URL" field in the container form
• Claude Code integration settings (Settings > Containers) — auto-mount ~/.claude/ for Max Plan OAuth or inject API key, with optional auto-install of Claude Code in containers
• Copy-to-clipboard docker exec commands for connecting via external terminals (Warp, etc.)
• UI audit fixes across all container components — design system normalization (.input/.btn/.card classes), accessibility (ARIA labels, keyboard nav, focus management), responsive layout, error feedback, and modal hardening (Escape/backdrop dismiss)

Key technical changes

Backend (Rust):

• Auto image pull before first container creation
• Containers stay alive with sleep infinity + TTY (fixes devcontainer immediate exit)
• Interactive shell sessions via Bollard exec API with Tauri event streaming
• repo_url column + migration for git clone on first start
• post_create_command execution after repo clone
• Claude Code settings stored in app_settings table
• Delete now properly removes Docker containers (fixes name conflict bug)

Frontend (Svelte 5):

• NewContainerWizard — two-step flow: pick template or custom, then configure
• ContainerTerminal — xterm.js with streaming I/O via Tauri events
• ContainerFiles — exec-based filesystem browser
• ContainerDetail — tabbed modal (Overview, Logs, Stats, Console, Files) with lifecycle controls
• Enhanced ContainerCard with status badges, action buttons, loading states
• Enhanced toast system with detail text and clickable actions
• SettingsContainersTab for Claude Code auth configuration

Test plan

• Create container from Node.js template with a GitHub repo URL
• Verify image pulls, container starts, repo clones into /workspace
• Test start/stop/restart from card buttons — verify status badges update
• Open Console tab — verify interactive bash with tab completion works
• Open Files tab — verify filesystem navigation works
• Test "View Logs" toast action when container stops unexpectedly
• Verify delete removes both DB entry and Docker container
• Configure Claude Code settings (Max Plan mode) and verify ~/.claude mount
• Copy docker exec command and verify it works in external terminal
• Test creating custom container (no template) with manual configuration