Add task board, plan tracking, and markdown table rendering

[braverior]

Summary

• Task Board UI: Add a collapsible task board above chat messages that tracks TaskCreate/TaskUpdate tool calls in real-time, with a segmented progress bar, status icons, and spinning animation for in-progress tasks
• Plan Tracking: Capture ExitPlanMode tool call content and render the plan inline below the tool call in the chat view
• Markdown Table Rendering: Add support for rendering Markdown.Table with styled headers, borders, and rounded corners
• Project Name Subtitle: Show project name as a subtitle in the chat header and instance list row when it differs from the session title
• Hook Event Enhancements: Forward tool_result and tool_response from the Python hook script to Swift for task ID resolution (temp ID → real ID)

Changes

File	Description
SessionState.swift	Add TaskItem model, tasks/planContent/planFilePath properties, and task lifecycle methods
SessionStore.swift	Add processTaskTracking and processPlanTracking event handlers
claude-island-state.py	Parse tool_result/tool_response to extract resolved task IDs
HookSocketServer.swift	Add toolResult, resolvedTaskId, resolvedTaskSubject fields to HookEvent
ChatView.swift	Add Task Board UI, plan inline rendering, project name subtitle in header
MarkdownRenderer.swift	Add Markdown.Table rendering support
ClaudeInstancesView.swift	Show project name in instance list
PlanDetailView.swift	New view for plan detail display
PlanPreviewView.swift	New view for plan preview
PlanWindowController.swift	New window controller for plan windows

Test plan

• Verify Task Board appears when Claude uses TaskCreate and updates live with TaskUpdate
• Verify progress bar segments change color as tasks transition between pending → in_progress → completed
• Verify collapsing/expanding the task board works smoothly
• Verify ExitPlanMode renders plan content inline in the chat
• Verify markdown tables render correctly with headers and borders
• Verify project name subtitle shows in chat header and instance list
• Verify task list resets on new user prompt submission

[braverior]

[braverior]

Plan mode