refactor: migrate PromptConfigManager save to updateSearchSpaceMutationAtom

[dekalouis]

Migrate PromptConfigManager save handler from a raw authenticatedFetch call to the shared updateSearchSpaceMutationAtom, making all three settings managers consistent.

Description

Replaces the raw authenticatedFetch PUT call in PromptConfigManager.handleSave with updateSearchSpaceMutationAtom. Removes the local saving state (replaced by isPending from the mutation), drops the manual fetchSearchSpace() refetch (the atom's onSuccess already invalidates the cache), and removes now-unused imports (authenticatedFetch, BACKEND_URL).

Motivation and Context

general-settings-manager and team-memory-manager both route their save through updateSearchSpaceMutationAtom, which provides Zod validation, typed error handling via baseApiService, and centralized cache invalidation. PromptConfigManager was bypassing all of that with a raw fetch, causing inconsistent error handling and cache behavior across the three managers.

FIX #1361

Screenshots

N/A — pure refactor, no visual change.

API Changes

• This PR includes API changes

Change Type

• Bug fix
• New feature
• Performance improvement
• Refactoring
• Documentation
• Dependency/Build system
• Breaking change
• Other (specify):

Testing Performed

• Tested locally
• Manual/QA verification

Open Settings → Prompt Config, edit the instructions and click Save — success toast appears and the textarea reflects the saved value. TypeScript reports zero errors on the changed file (npx tsc --noEmit --skipLibCheck).

Checklist

• Follows project coding standards and conventions
• Documentation updated as needed
• Dependencies updated as needed
• No lint/build errors or new warnings
• All relevant tests are passing

High-level PR Summary

This PR refactors the PromptConfigManager to use the shared updateSearchSpaceMutationAtom instead of raw authenticatedFetch calls for saving prompt configurations. This change aligns the component with the existing patterns used in general-settings-manager and team-memory-manager, providing consistent error handling, Zod validation, and automatic cache invalidation across all three settings managers. The local saving state is replaced with isPending from the mutation hook, and manual cache refetching is removed since the mutation atom handles cache invalidation automatically.

⏱️ Estimated Review Time: 5-15 minutes

💡 Review Order Suggestion

Order	File Path
1	surfsense_web/components/settings/prompt-config-manager.tsx

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