deb: drive build_binary_package through the BuildView port

The binary build joins the source build on the reporting ports:
build_binary_package takes a DebBuildOptions struct (replacing eleven
positional arguments), reports target, phases, progress and the
outcome through the environment-agnostic BuildView, and the Phase enum
with its default classifiers moves from the terminal widget into the
deb module (announced through the enter_phase helper). DebUi loses its
inherent event methods and only implements the port; tee logging and
the SIGINT behavior are unchanged.

No behavior change for the CLI; headless consumers pass report::Quiet.

src/build/mod.rs

@@ -24,7 +24,7 @@ use crate::debian::{
     ChecksumEntry, ControlInfo, FileChecksums, FilesEntry, FilesList, parse_paragraphs,
 };
 use crate::logfmt::{DpkgSourceClassifier, GenericClassifier};
-use crate::report::{BuildView, Prompter};
+use crate::report::{BuildTarget, BuildView, Prompter};
 
 /// Whether the upload distributes the upstream orig tarballs (`--orig`),
 /// mirroring the `dpkg-genchanges` source styles.
@@ -294,7 +294,12 @@ pub fn run_source_build(
 
     let ctrl = ControlInfo::parse(&control_path)?;
 
-    view.target(&entry.source, &entry.version.full(), &entry.distribution);
+    view.target(BuildTarget {
+        package: &entry.source,
+        version: &entry.version.full(),
+        target: &entry.distribution,
+        source_only: true,
+    });
 
     let source_display = entry.source.clone();