[hashkrish]

🎯 What: The central UI routing logic in the massive Update function (over 700 lines) within internal/ui/model.go was refactored into a separate file (internal/ui/update.go) with smaller helper methods like handleKeyMsg, handlePaletteRoute, handleSwitchToLogs, and handleMouseMsg.
💡 Why: A massive, monolithic central routing logic switch is risky and complex. Breaking it apart reduces complexity, significantly improves readability, and makes it much easier to maintain, test, and safely extend moving forward.
✅ Verification: I executed the project test suite (go test ./...) and built the codebase (go build ./...) completely without errors. The original control flow, including pointer mutation semantics and unhandled event fallthrough behaviors, is exactly preserved.
✨ Result: The model.go file is significantly cleaner, the code health of the routing component is vastly improved, and there are no functional regressions.

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PR created automatically by Jules for task 8813202536868388156 started by @hashkrish

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