feat(desktop): add pitch-preserving TTS playback speed

.cargo/config.toml

@@ -9,3 +9,10 @@ debug = "line-tables-only"
 # cmake_minimum_required < 3.5; audiopus_sys's vendored opus declares 3.1.
 # Same workaround CI uses. A value already set in the environment wins.
 CMAKE_POLICY_VERSION_MINIMUM = "3.5"
+
+# MSVC otherwise reports the legacy C++98 value for `__cplusplus`, even when
+# cc-rs selects C++14. sstretch uses that macro to gate its C++11
+# `std::make_unique` polyfill, which collides with the MSVC standard library.
+# Match sherpa-onnx's static MSVC runtime so both native audio libraries can
+# link into the same Tauri binary without LNK2038 RuntimeLibrary mismatches.
+CXXFLAGS_x86_64_pc_windows_msvc = "/Zc:__cplusplus /MT"

Cargo.toml

@@ -26,6 +26,7 @@ members = [
     "crates/buzz-pair-relay",
     "crates/buzz-relay-mesh",
     "crates/buzz-dev-mcp",
+    "crates/buzz-voice",
     "examples/countdown-bot",
 ]
 exclude = ["desktop/src-tauri"]

Justfile

@@ -276,6 +276,7 @@ test-unit:
     #!/usr/bin/env bash
     if command -v cargo-nextest &>/dev/null; then
         cargo nextest run -p buzz-core -p buzz-auth --lib
+        cargo nextest run -p buzz-voice --lib
         # buzz-db migrator/lint tests: pure SQL-parsing unit tests (no infra).
         # They guard the embedded-migrator invariant (exactly the consolidated
         # 0001; cutover/backfill stays an operator script, not startup state)

crates/buzz-voice/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "buzz-voice"
+version.workspace = true
+edition.workspace = true
+rust-version.workspace = true
+license.workspace = true
+repository.workspace = true
+description = "Reusable local voice primitives for Buzz"
+
+[dependencies]
+serde_json = { workspace = true }
+sherpa-onnx = "1.12"

crates/buzz-voice/src/lib.rs

@@ -0,0 +1,3 @@
+//! Reusable local voice primitives for Buzz.
+
+pub mod pocket;