Summary

• Adds ~22 new configuration fields to the desktop app settings, organized into 4 tabs: General, GPU & Performance, Generation Defaults, and Network & Security
• Refactors the monolithic Settings.tsx into modular tab components using Headless UI TabGroup
• New settings include: debug logging, keep-alive duration, flash attention, KV cache type, parallel requests, GPU overhead, schedule spread, Vulkan toggle, temperature/top_k/top_p/min_p/repeat_penalty/seed/num_predict defaults, host/port, HTTP/HTTPS proxy, no-proxy, CORS origins, and allowed remotes
• Backend: extends Settings struct, adds SQLite migration v15→v16, maps new fields to environment variables, extends server restart triggers
• New UI components: Select dropdown (Headless UI Listbox) and NumberInput with +/- controls

Related PRs

This is Part 1 of 3 in the Ollama Desktop UI improvement series:

1. This PR — Extended Settings: Tabbed settings UI with ~22 new configuration fields (General, GPU, Generation, Network)
2. PR app: add monitoring dashboard #14528 — Monitoring Dashboard: GPU/memory monitoring, loaded models, system tray extensions
3. PR app: add model manager with batch ops, copy, and per-model settings #14531 — Model Manager: Full model CRUD, batch ops, copy/alias, per-model settings

Each PR is independent and can be merged separately. Together they transform the desktop app from a chat-only interface into a comprehensive Ollama management tool with full settings control, real-time monitoring, and model lifecycle management.

Changes

Design decisions

• Generation defaults use nullable types (*float64/*int in Go, number | null in TS) — null means "use model/system default", distinguishing from zero values
• GPU & Performance tab hides Vulkan toggle on macOS (not applicable)
• CorsOrigins respects Browser setting — won't override wildcard origins when Browser is enabled
• All new settings with zero/empty defaults maintain backward compatibility
• Generation defaults do NOT trigger server restart (applied per-request)

Test plan

• Open Settings, verify all 4 tabs render correctly
• Toggle each boolean setting, verify persistence
• Change GPU/network settings, verify server restarts
• Change generation defaults, verify they do NOT trigger restart
• Reset to defaults, verify all fields clear properly
• Build passes: cd app/ui/app && npm run build
• TypeScript check passes: npx tsc --noEmit