docs: Add v0.3.2 release notes

docs/release-notes/v0.3.2.md

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+# v0.3.2 — Measuring large assemblies no longer lags when you orbit
+
+## 🐛 Bug fixes
+
+**Smooth orbit while measuring large models**
+* Fixed: with a large assembly loaded, switching to any measurement tool
+  (Distance, Edge, Face, Circle, Angle, Face-distance) and then rotating the
+  view used to lag badly — it hitched every time the view came to rest. Plain
+  browsing stayed smooth; only measuring was affected.
+* Measuring now rotates just as smoothly as browsing, at any model size.
+* Picking accuracy is unchanged — circles/holes, faces, edges, angles and
+  face-distance all read exactly as before, including inner hole walls.
+* Section-mode measurement is unaffected.
+
+## 📦 Downloads
+
+Two builds are produced:
+
+| Build | Needs .NET 8 Desktop Runtime? | Notes |
+|-------|-------------------------------|-------|
+| **Standard** (`STPViewer_v0.3.2`) | ✅ Yes | Smaller; for machines that already have the runtime |
+| **Portable** (`STPViewer_v0.3.2_portable`) | ❌ No | Runtime bundled — unzip and run, no install / admin needed |
+
+Run `STPViewer v0.3.2.exe`.
+
+**Full changelog:** [v0.3.1...v0.3.2](https://github.com/ETWen/STPViewer/compare/v0.3.1...v0.3.2)