benchmark: add 'Best for' column, rename GPU→CUDA (v2.0.4)

- BenchRow gains `best_for` field: "Short clips" / "Short / medium" /
  "Long / batch" / "Streaming" — derived from engine type and model name
- Device now shows "CUDA" instead of "GPU" for clarity
- Benchmark table gains a "Best for" column between Device and Time(s)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

linux/blitztext/__init__.py

@@ -6,4 +6,4 @@ counterpart to the macOS Blitztext menu bar app: it runs natively on the host
 (not in a container) so it can type into any application via xdotool.
 """
 
-__version__ = "2.0.3"
+__version__ = "2.0.4"

linux/blitztext/benchmark.py

@@ -19,7 +19,8 @@ from .routing import normalize
 class BenchRow:
     engine: str
     model: str
-    device: str       # "CPU" | "GPU" | "remote"
+    device: str       # "CPU" | "CUDA" | "remote"
+    best_for: str     # "Short clips" | "Short / medium" | "Long / batch" | "Streaming"
     ok: bool
     seconds: float
     wer: float
@@ -60,10 +61,29 @@ def wer(reference: str, hypothesis: str, *, case_sensitive: bool = False) -> flo
 
 def _engine_device(engine, transcriber) -> str:
     if engine.is_local:
-        return "GPU" if getattr(transcriber, "device", "cpu") == "cuda" else "CPU"
+        return "CUDA" if getattr(transcriber, "device", "cpu") == "cuda" else "CPU"
     return "remote"
 
 
+def _engine_best_for(engine) -> str:
+    if engine.type == "riva_realtime":
+        return "Streaming"
+    model = (engine.model or "").lower()
+    name = engine.name.lower()
+    if any(x in name for x in ("stream", "realtime", "real-time", "live")):
+        return "Streaming"
+    if engine.is_local:
+        if any(x in model for x in ("tiny", "base")):
+            return "Short clips"
+        if any(x in model for x in ("large",)):
+            return "Long / batch"
+        return "Short / medium"
+    # Remote endpoint
+    if any(x in name for x in ("large", "batch")):
+        return "Long / batch"
+    return "Short / medium"
+
+
 def run(engines, wav_path: Path, reference: str, *, language: str = "",
         case_sensitive: bool = True, get_local_transcriber=None, progress=None) -> list[BenchRow]:
     """Benchmark each engine; calls progress(row) as each finishes.
@@ -79,6 +99,7 @@ def run(engines, wav_path: Path, reference: str, *, language: str = "",
             engine=e.name,
             model=e.model or ("local" if e.is_local else "(default)"),
             device=_engine_device(e, tr),
+            best_for=_engine_best_for(e),
             ok=res.ok,
             seconds=res.seconds,
             wer=w,

linux/blitztext/gtksettings.py

@@ -1857,12 +1857,13 @@ notebook.bt-nb tab:checked label {
         run.set_halign(Gtk.Align.START)
         page.pack_start(run, False, False, 6)
 
-        self.bench_store = Gtk.ListStore(str, str, str, str, str, str)
+        self.bench_store = Gtk.ListStore(str, str, str, str, str, str, str)
         tree = Gtk.TreeView(model=self.bench_store)
         for title, i, expand in [("Engine", 0, False), ("Model", 1, False), ("Device", 2, False),
-                                 ("Time (s)", 3, False), ("Accuracy", 4, False), ("Output", 5, True)]:
+                                 ("Best for", 3, False), ("Time (s)", 4, False),
+                                 ("Accuracy", 5, False), ("Output", 6, True)]:
             r = Gtk.CellRendererText()
-            if i == 5:
+            if i == 6:
                 r.set_property("ellipsize", Pango.EllipsizeMode.END)
             col = Gtk.TreeViewColumn(title, r, text=i); col.set_resizable(True)
             col.set_expand(expand)
@@ -1951,7 +1952,8 @@ notebook.bt-nb tab:checked label {
     def _bench_add_row(self, row) -> bool:
         acc = f"{row.accuracy:.1f}%" if row.ok else "—"
         out = row.text if row.ok else f"⚠ {row.error}"
-        self.bench_store.append([row.engine, row.model, row.device, f"{row.seconds:.2f}", acc, out])
+        self.bench_store.append([row.engine, row.model, row.device, row.best_for,
+                                 f"{row.seconds:.2f}", acc, out])
         return False
 
     def _bench_done(self, rows) -> bool: