Add SVG compression via npx svgo

Add vector extension support for .svg and route SVG files through npx svgo before raster compression.

Keep behavior fail-safe: missing npx/svgo or non-zero svgo exit returns None and preserves existing flow.

Extend tests for SVG discovery, SVG routing priority, and missing npx handling.

Co-Authored-By: Abacus.AI CLI <agent@abacus.ai>

pptx_image_compress.py

@@ -44,7 +44,9 @@ from typing import Callable, List, Optional
 
 __version__ = "1.1.7"
 
-ALLOWED_EXT = {".jpg", ".jpeg", ".png", ".webp", ".gif"}
+RASTER_EXT = {".jpg", ".jpeg", ".png", ".webp", ".gif"}
+VECTOR_EXT = {".svg"}
+ALLOWED_EXT = RASTER_EXT | VECTOR_EXT
 PROGRESS_BAR_LEN = 40
 TEMP_PREFIX = "pptx_compress_"
 DEFAULT_MIN_SAVINGS = "2%"
@@ -236,6 +238,45 @@ def compress_raster_image(
     )
 
 
+def compress_svg_with_svgo(
+    original: Path,
+    out_dir: Path,
+) -> Path | None:
+    if original.suffix.lower() not in VECTOR_EXT:
+        return None
+    npx_exe = which("npx")
+    if not npx_exe:
+        return None
+    out_dir.mkdir(parents=True, exist_ok=True)
+    out_file = out_dir / original.name
+    cmd = [
+        npx_exe,
+        "--yes",
+        "svgo",
+        str(original),
+        "-o",
+        str(out_file),
+    ]
+    try:
+        r = subprocess.run(cmd, capture_output=True, text=True)
+        if r.returncode != 0:
+            sys.stderr.write(f"[svgo] Fehler bei {original.name}:{r.stderr}")
+            return None
+        return out_file if out_file.exists() else None
+    except Exception as ex:
+        sys.stderr.write(f"[svgo] Ausnahme bei {original.name}: {ex}")
+        return None
+
+
+def compress_vector_image(
+    original: Path,
+    out_dir: Path,
+) -> Path | None:
+    if original.suffix.lower() == ".svg":
+        return compress_svg_with_svgo(original=original, out_dir=out_dir)
+    return None
+
+
 def compress_image_with_routing(
     compressor: Callable[..., Path | None],
     original: Path,
@@ -244,6 +285,9 @@ def compress_image_with_routing(
     quality: int,
     min_savings: str,
 ) -> Path | None:
+    vector_out = compress_vector_image(original=original, out_dir=out_dir)
+    if vector_out is not None:
+        return vector_out
     return compress_raster_image(
         compressor=compressor,
         original=original,