Fix/offline mutation success and dynamic focus

[dorismaduegbunam]

1. Prevent offline mode from presenting stale mutation success (#1449)

Stream mutations (start, pause, stop, settle, withdraw, cancel) previously presented a "success" whenever the request promise resolved, even if the browser was offline or the server never applied the transition. A stale or dropped request could surface as a successful mutation.

• Gates every stream mutation on browser connectivity using a new useNetworkStatus hook (navigator.onLine + online/offline events). While offline the mutation is never dispatched and an "Offline - action not applied" error is shown instead.
• Adds a fail-closed confirmation guard: success is only presented when the response confirms the persisted server state (data.status). A resolved-but-unconfirmed body is treated as failure ("Action not confirmed").
• Applies the guard to both the stream row action button and the detail page actions, including the destructive withdraw/cancel flow.
• Adds focused tests for the hook, the guard, and offline / confirmed-success / unconfirmed-response / retry-after-reconnect scenarios.
• Also restores syntax corruption in the payment timeline, timestamp, and activity timeline components (build-blocking defects from an earlier merge) that prevented the suites from even loading.

Closes #1449

2. Add visible focus treatment for dynamic controls (#1424)

The CommandPalette combobox suppressed its native outline and relied on inline JS focus styling, and its aria-activedescendant listbox active option was distinguishable only by background tint — no visible focus ring for keyboard and assistive-technology users.

• Moves the palette input onto the shared @layer focus rules: a :focus-visible accent ring plus theme-safe suppression for mouse/touch focus.
• Adds a visible active-option ring (inset theme-background framing around the accent pill).
• Adds Home/End navigation and aria-autocomplete="list" for a complete combobox autocomplete pattern.
• Extends the focus-layer regression tests and adds behavior tests.

Closes #1424

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