Play cross-rate captures at their own pitch and length

The voice now converts the file's rate to the host's at note-on instead of assuming they match. Stage times resolve at the host rate, the filter solves at it, and the bake follows. Same-rate renders are unchanged bit for bit.

src/shell/instrument/instrument_bake.cpp

@@ -114,7 +114,7 @@ BakeChainResult runBake(ReaSamplerProcessor& processor) {
     if (!sourceEntry) return fail("the loaded capture has no resolvable file");
     const SelectedSample* source = &sourceEntry->ref;
 
-    const int sampleRate = static_cast<int>(processor.sampleRate());
+    const int sampleRate = processor.hostRenderRate();
     if (sampleRate <= 0) return fail("the host has not reported a sample rate yet");
 
     const std::optional<Tempo> tempo = Tempo::fromBpm(bridge.projectTempoBpm());
@@ -128,7 +128,7 @@ BakeChainResult runBake(ReaSamplerProcessor& processor) {
 
     // The snapshot comes first: the default program's window is derived from the sound it
     // carries (a Gate release, a Trigger play span), not from a constant.
-    std::optional<SampleData> snapshot = processor.bakeSnapshot();
+    std::optional<SampleData> snapshot = processor.bakeSnapshot(sampleRate);
     if (!snapshot) return fail("the loaded capture could not be decoded for the render");
 
     // The note fires at the velocity the user has been auditioning at: three velocity curves