Target server settings by environment

[colonelpanic8]

What Changed

• Add one shared environment selector across General, Providers, Keybindings, Source Control, and Diagnostics settings.
• Route server-backed settings to the selected environment while keeping client-only preferences in local client storage.
• Use the active saved environment for global keybindings, provider updates, and server presentation when no primary environment exists.
• Resolve new-thread defaults, worktree behavior, editors, and keybindings from the project or thread environment.
• Incorporate per-environment provider configuration and environment-scoped diagnostics behavior.
• Disable server-backed controls while the selected environment is disconnected.

Why

Client-only desktop mode deliberately has no PrimaryConnectionTarget, but several settings surfaces still read and wrote exclusively through primary-server atoms and hooks. Those controls therefore displayed defaults and silently failed to persist.

Settings now resolve an explicit selection first, then the managed primary environment, the active saved environment, and finally the first available environment. This preserves existing managed-client behavior while making client-only and multi-environment operation explicit.

UI Changes

• General Settings now starts with a Server Settings environment row showing connection state and the selected environment.
• Providers, Keybindings, Source Control, and Diagnostics use the same shared selection.
• Client-local settings remain available when an environment is disconnected; server-backed controls are disabled until it reconnects.
• Provider accounts and authorization state are shown only for the selected environment.

This PR is stacked on desktop-client-only-discovery, the branch behind #4444. It also carries the environment-scoped provider and diagnostics work needed by the complete settings flow.

Checklist

• vp test run apps/web/src/components/settings/SettingsPanels.logic.test.ts apps/web/src/components/settings/DiagnosticsSettings.logic.test.ts apps/web/src/hooks/useSettings.test.ts — 31 tests passed
• Targeted vp lint --report-unused-disable-directives for all changed files
• vp run --filter @t3tools/web build
• Integrated authenticated browser verification across General, Providers, Keybindings, Source Control, and Diagnostics
• Confirmed assistant output, provider update checks, and the add-project base path persist through reload
• vp run --filter @t3tools/web typecheck remains blocked by pre-existing unrelated errors in BranchToolbarBranchSelector, ModelPickerContent, PreviewAutomationHosts, and the atom command/query helpers

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Note

High Risk
Touches desktop startup/shutdown, custom protocol static serving, and relaunch; web surfaces now depend on per-environment connection state instead of always-available primary server atoms.

Overview
Introduces a managed vs client-only desktop backend mode (--backend-mode, persisted backendMode, IPC + Connections UI). In client-only, startup skips the backend pool, registers the custom protocol as static (packaged renderer) or dev proxy, opens the window via handleRendererReady, and omits local bootstraps; shutdown skips pool teardown. Managed mode keeps proxying to the backend but drops the separate backendOrigin on protocol registration.

Electron protocol gains source: "proxy" | "static" with path-normalized static serving (SPA fallback, HEAD, traversal guards). Relaunch schedules the replacement process earlier, surfaces DesktopLifecycleRelaunchError, and setBackendMode rolls back settings if relaunch fails.

On the web side, server-backed settings (General, Providers, Keybindings, Source Control, Diagnostics) use a shared environment selector and useSettingsEnvironment / per-environment settings hooks instead of primary-only reads. Diagnostics is scoped to the selected environment with connection notices, disabled refresh when offline, and per-environment pending process signals. Chat, sidebar, and command palette stop using primaryServer* atoms for keybindings, providers, and config—useDefaultServerConfig and thread/project environment config drive defaults; remote thread labeling uses EnvironmentPresenceScope / ownsLocalEnvironment rather than comparing only to the primary id.

^{Reviewed by Cursor Bugbot for commit 13a79c6. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Scope settings panels and server config reads to target environment with desktop client-only mode support

• Settings panels (General, Providers, Source Control, Keybindings, Diagnostics) now include an environment selector and scope server-side reads and writes to the chosen environment; controls are disabled when the selected environment is not connected.
• Adds a client-only desktop backend mode that skips local backend startup, serves the renderer from either a dev proxy or packaged static assets, and hides local backend management UI.
• New useDefaultServerConfig and useDefaultEnvironmentId hooks replace direct reads from primaryServer* atoms across sidebar, command palette, and chat components.
• buildSidebarProjectSnapshots and remote-thread indicators now use isRemoteEnvironmentId with an EnvironmentPresenceScope instead of direct primary environment ID comparisons.
• DesktopLifecycle.relaunch now propagates typed DesktopLifecycleRelaunchError failures to callers; setBackendMode rolls back settings when a triggered relaunch fails.
• Risk: Components that previously read from global primary-server atoms now depend on per-environment config availability; surfaces will show defaults or be disabled when no environment is connected.

^{Macroscope summarized 13a79c6.}

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[macroscopeapp]

Approvability

Verdict: Needs human review

This PR introduces a new "client-only" desktop mode that fundamentally changes how the app can operate - allowing it to run without managing a local backend. The changes span startup behavior, settings scoping, IPC contracts, and environment handling. Given this is a significant new feature affecting core app behavior, human review is warranted.

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