build: clean bin directory before building

- Make `make build` remove the bin/ directory first to ensure only current binaries are present
- Prevents old `clipbridge*` artifacts from appearing when users clone and build the project
- Improves launch hygiene and first-time contributor experience

Author: morganlinton

Makefile

@@ -6,6 +6,8 @@ GO = go
 GOFLAGS = -trimpath
 
 build:
+	@rm -rf bin/
+	@mkdir -p bin
 	$(GO) build $(GOFLAGS) -ldflags "$(LDFLAGS)" -o bin/pastelocal ./cmd/pastelocal
 	$(GO) build $(GOFLAGS) -ldflags "$(LDFLAGS)" -o bin/pastelocald ./cmd/pastelocald
 	$(GO) build $(GOFLAGS) -ldflags "$(LDFLAGS)" -o bin/pastelocal-remote ./cmd/pastelocal-remote