Fix explorer network link, copy control clipping, auth-expiry route, invoice list refresh

[Freezyyy-arch]

Closes #918
Closes #917
Closes #916
Closes #915

Summary

c0f4db6: Derive transaction explorer link from configured network (#918)

• Added utils/explorerUrl.ts (getExplorerTxBaseUrl) mapping the network passphrase to the Stellar Expert public or testnet segment.
• PaymentReceipt.tsx and InvoiceTimeline.tsx now default to it instead of a hard-coded testnet URL; added tests/explorerUrl.test.ts.

adac780: Prevent mobile layout from clipping invoice identifier copy control (#917)

• CopyableText.tsx: value span gets a copyable-text__value class.
• App.css: small rules cap width and let long identifiers wrap so the copy icon stays visible; test added to CopyableText.test.tsx.

28ef77f: Document and test valid fallback route after authentication expires (#916)

• Behavior already correct: disconnect calls setTab("payment") and parseTabHash falls back to the default tab; only docs and tests changed.
• Added docs/drips-notes/916-invalid-route-after-auth-expiry.md and a regression test in useHashTab.test.ts.

afff2d0: Refresh invoice list after a successful payment (#915)

• New utils/invoiceEvents.ts with emitPaymentCompleted; PaymentReceipt.tsx emits it when a confirmed-payment receipt renders.
• InvoiceList.tsx listens for the event and refetches by bumping reloadKey; test added in tests/invoiceEvents.test.ts.

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