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)

CHANGELOG.md

@@ -107,6 +107,16 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 
 
+### PsyLab — Performance Probe rename, Tuning tab, and log tools
+
+**By [@cucadmuh](https://github.com/cucadmuh), PR [#1027](https://github.com/Psychotoxical/psysonic/pull/1027)**
+
+* **Ctrl+Shift+D** opens **PsyLab** (formerly Performance Probe). Cover backfill thread tuning moved to a new **Tuning** tab.
+* **Logs** tab: selectable text, toolbar copy/export, and a context-menu **Copy** for the current selection.
+* Runtime log lines are sanitized before they enter the buffer — Subsonic/auth tokens and remote hostnames are redacted or partially masked; LAN and localhost addresses stay readable.
+
+
+
 ## Fixed
 
 ### Servers — complete border on the active server card