Name captures after their source track: label and filename both, on every interactive mint site, and show the name on the panel card

tests/test_bank_model.cpp

@@ -489,6 +489,36 @@ static void testLegacyJsonDefaults() {
     }
 }
 
+// A bank written before captures were named after their source track carries the literal
+// "item"/"track" label. Nothing migrates or relabels it: the label must survive load and
+// re-serialize byte-identically, so an old bank reads exactly as it did.
+static void testPreNamingSchemeLabelsSurviveUntouched() {
+    const char* old =
+        "{\"version\":1,\"samples\":["
+        "{\"id\":\"cap-1700000000-1-item_1700000000-1.wav\","
+        "\"displayName\":\"item\",\"relativePath\":\"reasampler_bank/item_1700000000-1.wav\","
+        "\"contentHash\":\"h-old-a\"},"
+        "{\"id\":\"cap-1700000000-2-track_1700000000-2.wav\","
+        "\"displayName\":\"track\",\"relativePath\":\"reasampler_bank/track_1700000000-2.wav\","
+        "\"contentHash\":\"h-old-b\"}]}";
+    auto r = BankModel::deserialize(old);
+    CHECK(r.has_value());
+    if (!r) return;
+
+    const Sample* a = r->query("cap-1700000000-1-item_1700000000-1.wav");
+    const Sample* b = r->query("cap-1700000000-2-track_1700000000-2.wav");
+    CHECK(a && a->displayName == "item");
+    CHECK(b && b->displayName == "track");
+
+    auto again = BankModel::deserialize(r->serialize());
+    CHECK(again.has_value());
+    CHECK(again && *again == *r);
+    if (again) {
+        const Sample* a2 = again->query("cap-1700000000-1-item_1700000000-1.wav");
+        CHECK(a2 && a2->displayName == "item");
+    }
+}
+
 // S2 test case 4: boundary values for the seam fields are representable and
 // round-trip. rootNote 0 and 127 (the MIDI edges); loopStart == loopEnd (a valid
 // zero-length marker); a loop whose end sits at the file's last frame. Also asserts
@@ -588,6 +618,7 @@ int main() {
     testIntegerOverflow();
     testEnumRangeValidation();
     testLegacyJsonDefaults();
+    testPreNamingSchemeLabelsSurviveUntouched();
     testSeamFieldBoundaries();
     testSeamFieldsAdditiveInvariant();