refactor/enhance: Unified Tool Collapse Implementation

[luke3butler]

Summary

Standardizes collapsible behavior across tools with a reusable ToolCollapse component and adds collapse functionality to 4 additional tools.

Changes

• New ToolCollapse component for consistent collapse behavior and DRY implementation
• Migrated existing collapsible tools (ReadTool, SearchTool, WebTool, FallbackTool) to use ToolCollapse
• Added collapse to BashTool, EditTool, WriteTool, and PlanTool with expanded defaults
• Maintained sensible defaults: collapsed for originally collapsible tools, expanded for newly collapsible ones
• TodoTool and TaskTool remain unchanged