Minor text cleanup in comments, configs, and tests

frontend/src/__tests__/AccuracyTracker.test.ts

@@ -94,7 +94,7 @@ describe("AccuracyTracker", () => {
     bus.emit("note:on", note);
     bus.emit("input:note:on", { midi: 60, velocity: 80 }); // correct hit
     const countBefore = updates.length;
-    bus.emit("note:off", note); // already hit — should not emit again
+    bus.emit("note:off", note); // already hit - should not emit again
 
     // No new accuracy:update should have been emitted for the note:off
     expect(updates.length).toBe(countBefore);
@@ -247,7 +247,7 @@ describe("AccuracyTracker", () => {
     bus.emit("transport:seek", { seconds: 5 }); // clears pending
 
     const countBefore = updates.length;
-    bus.emit("note:off", note); // pending was cleared — should be a no-op
+    bus.emit("note:off", note); // pending was cleared - should be a no-op
 
     // No new accuracy:update should have fired
     expect(updates.length).toBe(countBefore);

frontend/src/__tests__/MidiClock.test.ts

@@ -116,7 +116,7 @@ describe("MidiClock", () => {
       mockTransport.seconds = 2;
       expect(clock.currentSeconds).toBe(5);
 
-      // Change multiplier — currentSeconds must remain 5
+      // Change multiplier - currentSeconds must remain 5
       clock.tempoMultiplier = 0.5;
       expect(clock.currentSeconds).toBeCloseTo(5);
     });

frontend/src/__tests__/colorUtils.test.ts

@@ -36,7 +36,7 @@ describe("lighten", () => {
   });
 
   it("handles zero channel values", () => {
-    // Red only — green and blue stay 0
+    // Red only - green and blue stay 0
     // Math.round(255 * 0.5) = Math.round(127.5) = 128 = 0x80
     expect(lighten(0xff0000, 0.5)).toBe(0x800000);
   });