Update CHANGELOG.md with today's batch (audio metering + LAN + UI polish)

CHANGELOG.md

@@ -125,6 +125,55 @@ adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
   and starts a fresh subdirectory). Surfaced via `MainViewModel.RollRecordingCommand`,
   REST `POST /recording/roll`, and OSC `/teamsiso/recording/roll`. Useful
   for chaptering between show segments.
+- **Engine audio peak metering** — `IsoHealthStats.PeakAudioLevel` now
+  reports real values (was always 0.0). New `INdiInterop.CaptureAudioPeak`
+  method polls audio frames; production `NdiInteropPInvoke` parses
+  `NDIlib_audio_frame_v3_t` and computes max-absolute peak across all
+  channels. `NdiReceiver` runs a sibling audio capture loop on the same
+  lifetime so the existing video path is unaffected. UI VU bars in the
+  participants DataGrid now animate against real source audio. Failures
+  in the audio loop are caught + logged but never re-thrown — a
+  misbehaving audio path must never tear down the live video pipeline.
+  14 new unit tests in `AudioPeakComputerTests` covering FLTP / FLT / PCM
+  s16 across edge cases (clipping, `short.MinValue` overflow, defensive
+  `totalSamples`-vs-buffer mismatch handling).
+
+#### LAN-reachable control surface
+- `ControlSurfaceServer.Start(port, bindToLan)` and `OscBridge.Start(port,
+  bindToLan)` switch between `127.0.0.1` and all-interfaces (`http://+:port/`,
+  `IPAddress.Any`) based on the new `ControlSurfaceLanReachable` UI preference.
+  Settings VM persists the toggle, restarts both surfaces on flip, and
+  surfaces a `ControlSurfaceUrl` (computed from the host's first physical-NIC
+  routable IPv4 — Tailscale / VPN / APIPA addresses are skipped) plus a Copy
+  button. Use case: headless host PC running Teams + TeamsISO; thin client
+  on the same LAN drives `/ui` or hits the REST endpoints. Closed-network
+  deployment, no auth — documented as a trusted-LAN-only mode in
+  `docs/CONTROL-SURFACE.md`. First-time use requires a one-shot
+  `netsh http add urlacl url=http://+:9755/ user=Everyone` (so the listener
+  can bind without admin); the diagnostic warning fires the exact command
+  string in the log if the bind fails.
+
+#### UI polish — visible affordances on the dark canvas
+- Hover state on every themed button (Ghost / Caption / RailIcon / IsoToggle)
+  was barely distinguishable from the resting state. Bumped `Wd.SurfaceHover`
+  + `Wd.SurfaceActive` colours for sufficient contrast, added dedicated
+  `Wd.Button.HoverBg` / `Wd.Button.PressBg` brushes with a slight chroma tint,
+  and added cyan accent borders so mouse-hover and tab-focus give an
+  unmistakable affordance regardless of which surface the button sits on.
+  IsoToggle keeps its status-coded background (LIVE cyan / ERROR coral /
+  NO SIGNAL amber) on hover; the affordance is a 2px cyan border pop.
+- `IsKeyboardFocused` triggers added on every themed button so tab-cycling
+  through the UI gives visual feedback (was nothing — `FocusVisualStyle`
+  was `x:Null` with no replacement).
+- ScrollBar restyled: slim transparent track + tinted thumb (Edge / VS Code
+  pattern) in place of the chunky Win9x default with line-up / line-down
+  arrow buttons. Track-clicks above/below the thumb still page-scroll.
+- ToolTip restyled: SurfaceElevated card with rounded 6px corner + 320px
+  text wrap, replacing the cream Win98 popup. Affects every tooltip across
+  MainWindow.
+- ContextMenu / MenuItem restyled: dark card with rounded corners + cyan-
+  tinted hover. Affects the right-click menu on participant rows
+  (Toggle ISO / Restart this ISO / Open preview / Record / Copy NDI source name).
 
 #### Control surface
 - REST API on `127.0.0.1:9755` with endpoints for participant ISO toggle (by
@@ -164,5 +213,13 @@ adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
   (`width*height*4 > Pixels.Length`).
 - `HasThumbnail` correctly fires `PropertyChanged` when `Thumbnail`
   transitions from null.
+- WinForms / WPF `Application` and `MessageBox` namespace collision
+  (introduced when `<UseWindowsForms>true</UseWindowsForms>` was added for
+  the system tray) resolved via project-wide `GlobalUsings.cs`.
+- `GetLanIPv4()` now skips Tailscale / VPN tunnel adapters and APIPA
+  (`169.254.x`) so the displayed control-surface URL points at the
+  routable LAN IP (verified on a host with both Ethernet 10.x and a
+  Tailscale 169.254 link-local — picker now correctly returns the
+  Ethernet address).
 
 [Unreleased]: https://forge.wilddragon.net/zgaetano/teamsiso/compare/v0.1.0...HEAD