fix(aiicons): emit marker-less base64 data URI so --embed icons render (#82)

The ';base64,' marker (added in #36) breaks draw.io's style parser, which
splits style values on ';' — the image= value gets truncated at
'data:image/svg+xml' and the icon renders as a blank box. Switch both embed
paths (lobe-icons and simple-icons fallback) to the marker-less form
'data:image/svg+xml,<base64>', draw.io's own convention for embedded images.

Verified via drawio CLI 30.2.6: marker-less renders, ';base64,' is blank.

Fixes #80

Author: Agents365-ai

skills/drawio-skill/SKILL.md

@@ -1,6 +1,6 @@
 ---
 name: drawio-skill
-version: 1.28.1
+version: 1.28.2
 description: Use when the user requests diagrams, flowcharts, architecture diagrams, ER diagrams, UML / sequence / class diagrams, network topology, cloud architecture from Terraform or Kubernetes manifests, ML/DL model figures (Transformer/CNN/LSTM), mind maps, or any visualization. Also use proactively when explaining systems with 3+ components, complex data flows, or relationships that benefit from visual representation. Best suited when the diagram needs custom styling, rich shape vocabulary, swimlanes, or exportable images (PNG/SVG/PDF/JPG). Generates .drawio XML and exports locally via the native draw.io desktop CLI.
 license: MIT
 homepage: https://github.com/Agents365-ai/drawio-skill

skills/drawio-skill/scripts/aiicons.py

@@ -164,7 +164,9 @@ def main():
                     continue
                 # Rewrite the 1em intrinsic size so draw.io scales the inlined SVG.
                 svg = svg.replace(b'width="1em"', b'width="24"').replace(b'height="1em"', b'height="24"')
-                image = "data:image/svg+xml;base64," + base64.b64encode(svg).decode()
+                # Marker-less base64: draw.io splits style values on ';', so a
+                # ';base64,' marker would truncate the image= value (issue #80).
+                image = "data:image/svg+xml," + base64.b64encode(svg).decode()
             else:
                 image = url
             results.append({"brand": base, "file": file, "w": args.size, "h": args.size,
@@ -179,7 +181,8 @@ def main():
             if args.embed:
                 try:
                     svg = urllib.request.urlopen(url, timeout=15).read()
-                    image = "data:image/svg+xml;base64," + base64.b64encode(svg).decode()
+                    # Marker-less base64 (see issue #80 note above).
+                    image = "data:image/svg+xml," + base64.b64encode(svg).decode()
                 except Exception as exc:                   # noqa: BLE001 - keep the CDN URL
                     sys.stderr.write(f"warning: could not fetch {url} ({exc}); using CDN URL\n")
             results.append({"brand": brand, "file": f"simpleicons:{slug}",