feat(psylab): rename probe, Tuning tab, log tools, and safe log sanitization (#1027)

* feat(psylab): rename probe UI, add Tuning tab and log copy/export

PsyLab (Ctrl+Shift+D): cover backfill threads move to Tuning; logs gain
selectable text, toolbar copy/export, and a selection-only context menu.

* fix(logging): redact secrets and mask remote hosts in runtime logs

Sanitize lines at append time (buffer, CLI tail, export) and in PsyLab:
Subsonic/auth query params, bearer tokens, password fields, URL userinfo;
remote hostnames partially starred, LAN/localhost left readable.

* fix(logging): UTF-8-safe log sanitization — unbreak playback on em dash

Byte-indexed URL scanning panicked on multi-byte chars (e.g. "—" in stream
logs), killing tokio workers and aborting playback. Iterate by char boundary;
add infallible wrapper on the append hot path.

* docs(changelog): PsyLab UI and safe log sanitization (PR #1027)

src/hooks/useSidebarPerfProbe.ts

@@ -45,7 +45,7 @@ function useNeedCoverTelemetry(perfProbeOpen: boolean, livePins: ReadonlySet<str
   );
 }
 
-/** Wires Ctrl+Shift+D probe modal and shared live metric polling. */
+/** Wires Ctrl+Shift+D PsyLab modal and shared live metric polling. */
 export function useSidebarPerfProbe(): Result {
   const [perfProbeOpen, setPerfProbeOpen] = useState(false);
   const livePins = usePerfLiveOverlayPins();