🪟 fix: Tab Isolation for Agent Favorites + MCP Selections (#11786)

* 🔧 refactor: Implement tab-isolated storage for favorites and MCP selections

- Replaced `createStorageAtom` with `createTabIsolatedAtom` in favorites store to prevent cross-tab synchronization of favorites.
- Introduced `createTabIsolatedStorage` and `createTabIsolatedAtom` in `jotai-utils` to facilitate tab-specific state management.
- Updated MCP values atom family to utilize tab-isolated storage, ensuring independent MCP server selections across tabs.

* 🔧 fix: Update MCP selection logic to ensure active MCPs are only set when configured servers are available

- Modified the condition in `useMCPSelect` to check for both available MCPs and configured servers before setting MCP values. This change prevents potential issues when no servers are configured, enhancing the reliability of MCP selections.

client/src/hooks/MCP/useMCPSelect.ts

@@ -28,7 +28,7 @@ export function useMCPSelect({
     const mcps = ephemeralAgent?.mcp ?? [];
     if (mcps.length === 1 && mcps[0] === Constants.mcp_clear) {
       setMCPValuesRaw([]);
-    } else if (mcps.length > 0) {
+    } else if (mcps.length > 0 && configuredServers.size > 0) {
       // Strip out servers that are not available in the startup config
       const activeMcps = mcps.filter((mcp) => configuredServers.has(mcp));
       setMCPValuesRaw(activeMcps);