feat: Refine provider settings and picker availability states

[huxcrux]

What Changed

Refined the provider settings and picker experience.

• Reworked the Providers section in Settings into a cleaner expandable list.
• Added an app-level enabled/disabled toggle for each supported provider.
• Surfaced not found and unauthed states more clearly in provider settings.
• Improved the expanded provider panel so status, errors, and controls are easier to scan.
• Prevented disabled, missing, or unauthed providers from being selected in provider pickers.
• Updated related tests and browser fixtures to cover the new provider settings behavior.

Why

The provider settings were getting long and repetitive, and that will become more noticeable as more providers are added.

Grouping each provider into its own expandable section makes the settings easier to scan now and gives us a better place to add provider-specific options later. It also makes provider availability more explicit and predictable: if a provider is disabled, not found, or unauthed, it should not appear selectable elsewhere in the app.

UI Changes

Added aa few extra pictures to show the different states when a provider is not found, unauthed or working fine.

Provider picker:

Before	After

Settings:

Before	After

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Note

Add per-provider enable/disable toggles, status badges, and refresh capability to settings

• Adds an enabledProviders field to AppSettings (defaulting both codex and claudeAgent to true) with helpers isProviderEnabled, getEnabledProviderOptions, and patchProviderEnabled in appSettings.ts
• Adds a new Providers section to the settings page (_chat.settings.tsx) with expandable per-provider panels showing status badges, enable/disable toggles, provider-specific overrides, and custom model management; replaces the previous global Codex and custom model UIs
• Adds a 'Refresh all' button that calls a new server.refreshProviderStatuses WebSocket RPC, backed by a refreshStatuses effect in ProviderHealth.ts that recomputes and caches statuses
• Updates ChatView.tsx and ProviderModelPicker.tsx to block sending, plan implementation, and model selection when the selected provider is disabled, unavailable, or unauthenticated; shows a warning banner with a link to settings
• Behavioral Change: the composer textarea, submit buttons, and refine/implement actions are now disabled when the active provider is not usable; the provider/model picker remains interactive to allow switching

^{Macroscope summarized 8cd00ec.}

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