fix: mf-6835 keep external wallet connected after done and show provider icon

[swkatmask]

Summary

Fixes the MF-6835 regression from #12433/#12435 (built-in Mask wallet removal): connecting an external wallet from the popup appeared to work but never stuck, and every external wallet showed Mask's own logo.

• ConnectWallet handleDone: no longer calls EVMWeb3.disconnect({ providerType }) — "Done" keeps the connection and just closes the popup window. Pre-removal, Done intentionally fell back to the built-in Mask wallet; with that gone, the disconnect tore down the connection the user just made. Persistence already works because non-background contexts proxy KV writes to the background, which broadcasts to all open contexts.
• WalletAvatar: for non-Firefly wallets, render the current EVM provider's icon (from getRegisteredWeb3Providers descriptor) instead of always falling back to Icons.MaskBlue. MaskBlue remains the fallback when no descriptor matches.
• WalletHeaderUI: the header only renders when an account exists, so show the green dot + Connected instead of the hardcoded grey "Not Connected" (leftover from the useConnected removal); drop the dead status transform on the network arrow.

Test Plan

• tsc --noEmit -p packages/mask clean
• pnpm lint clean
• Manual verification in Chrome-for-Testing with MetaMask: connect via popup → ConnectWallet page shows MetaMask icon/name/address → Done → popup Wallet tab shows connected (green dot + Connected) → reopen popup still connected

Closes MF-6835

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Project	Deployment	Actions	Updated
book	Ready	Preview	Sep 10, 2026 4:55pm UTC