Pull request overview

This PR updates the chat provider/model selection UX to a two-column popup while also introducing a new Copilot provider end-to-end (contracts, web settings/picker, and server runtime integration).

Changes:

• Replaces the stacked provider/model menu with a two-column popup (providers left, models right) and updates browser tests for the new interaction.
• Adds Copilot as a first-class provider across contracts, shared model utilities, web settings/custom models, and server health/adapter registry.
• Adds a single-write setProviderAndModel pathway to avoid intermediate draft states when switching provider+model.

Reviewed changes

Copilot reviewed 29 out of 30 changed files in this pull request and generated 2 comments.

import { RuntimeReceiptBusLive } from "./orchestration/Layers/RuntimeReceiptBus";
import { ProviderUnsupportedError } from "./provider/Errors";
import { makeClaudeAdapterLive } from "./provider/Layers/ClaudeAdapter";
import { makeCopilotAdapterLive } from "./provider/Layers/CopilotAdapter";
import { makeCodexAdapterLive } from "./provider/Layers/CodexAdapter";
import { makeOpenClawAdapterLive } from "./provider/Layers/OpenClawAdapter";
import { ProviderAdapterRegistryLive } from "./provider/Layers/ProviderAdapterRegistry";
import { makeProviderServiceLive } from "./provider/Layers/ProviderService";
import { ProviderSessionDirectoryLive } from "./provider/Layers/ProviderSessionDirectory";

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