Implement text wrapping in incident view

[clcollins]

Summary

• Long lines in the incident view now wrap to fit within the viewport width instead of extending off the right edge of the screen
• The glamour markdown renderer adds its own internal padding/margins, so the width is adjusted to account for this to ensure proper wrapping

Changes

• Modified renderIncidentMarkdown to accept a width parameter (pkg/tui/views.go:497)
• Pass viewport width from renderIncident to glamour renderer (pkg/tui/commands.go:218)
• Calculate adjusted width by subtracting 4 characters to account for glamour's internal padding (pkg/tui/views.go:500)
• Added minimum width safeguard of 40 characters to prevent issues with very narrow viewports (pkg/tui/views.go:501-503)
• Configure glamour with WithWordWrap(adjustedWidth) instead of WithWordWrap(0) (pkg/tui/views.go:507)

Test plan

• Run the application and view incidents with long lines
• Verify text wraps appropriately within the viewport
• Verify no horizontal scrolling is required
• Test with various terminal widths

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