TypeLayer: center via transform origin + text-size boundingBox

Keep justification untouched (user: don't force center - it made the edit
box huge / run off canvas). Instead center the text by putting the
transform origin at the boundingRect center and the boundingBox as the
actual text box (-w/2..w/2, -h/2..h/2): small edit box, centered text,
no justification spreading, last glyph fits.

ppl2psd.py

@@ -504,7 +504,7 @@ def font_ps_name(font_path: str) -> str:
         return os.path.basename(font_path)
 
 
-def build_type_layer_tysh(ly: dict, font_ps: str) -> bytes:
+def build_type_layer_tysh(ly: dict, font_ps: str, text_w: Optional[float] = None) -> bytes:
     """Build a TySh (TypeTool object setting) block for an editable text layer
     by mutating the reference template's engine data."""
     tmpl = Path(__file__).parent / "tools_tysh_template.bin"
@@ -525,13 +525,6 @@ def build_type_layer_tysh(ly: dict, font_ps: str) -> bytes:
     text_len = len(text)
     eng["StyleRun"]["RunLengthArray"] = List([Integer(text_len)])
     eng["ParagraphRun"]["RunLengthArray"] = List([Integer(text_len)])
-    # Template paragraph is justify (Justification=5), which spreads short
-    # text across the whole box. The ppl text is centered -> center align.
-    try:
-        props = eng["ParagraphRun"]["RunArray"][0]["ParagraphSheet"]["Properties"]
-        props["Justification"] = Integer(1)  # center
-    except Exception:
-        pass
 
     prof = font_profile(_font_path_for(ly))
     size_px = float(ly.get("textSize", "12") or 12) * prof["k"]
@@ -554,18 +547,27 @@ def build_type_layer_tysh(ly: dict, font_ps: str) -> bytes:
     # DocumentResources mirrors ResourceDict; keep both font tables in sync
     # or PS flags the text layer as needing conversion.
     ed["DocumentResources"]["FontSet"][0]["Name"] = String(font_ps)
+    # StyleSheetSet preset: set color too (PS may read the preset style)
+    try:
+        res["StyleSheetSet"][0]["StyleSheetData"]["FillColor"] = fc
+    except Exception:
+        pass
 
     l, t, rr, bb2 = bounding_rect(ly)
-    tysh.transform = [1.0, 0.0, 0.0, 1.0, float(l), float(t)]
+    # transform origin = center of the ppl rect; boundingBox = the actual
+    # text box centered on it. This keeps the text centered and the edit box
+    # small (template bbox / justification would spread text across a huge
+    # frame or run off canvas).
+    cx, cy = (l + rr) / 2, (t + bb2) / 2
+    tysh.transform = [1.0, 0.0, 0.0, 1.0, float(cx), float(cy)]
     tysh.left, tysh.top, tysh.right, tysh.bottom = int(l), int(t), int(rr), int(bb2)
-    # boundingBox is relative to the transform origin; PS shows the text at
-    # transform(boundingBox). Set it to (0,0)-(w,h) so the text lands on the
-    # ppl boundingRect (verified: l.psd display pos = transform x boundingBox).
+    tw = text_w if text_w else (rr - l)
+    th = size_px * 1.2
     bbd = td[b"boundingBox"]
-    bbd[b"Left"].value = 0.0
-    bbd[b"Top "].value = 0.0
-    bbd[b"Rght"].value = float(rr - l)
-    bbd[b"Btom"].value = float(bb2 - t)
+    bbd[b"Left"].value = -tw / 2
+    bbd[b"Top "].value = -th / 2
+    bbd[b"Rght"].value = tw / 2
+    bbd[b"Btom"].value = th / 2
     return tysh.tobytes()
 
 
@@ -836,7 +838,8 @@ def convert(ppl_path: str, out_path: str, preview_path: Optional[str] = None,
             if type_layer and ly["_type"] == "text" and _TYSHA:
                 try:
                     fp = _font_path_for(ly)
-                    tysh = build_type_layer_tysh(ly, font_ps_name(fp))
+                    tysh = build_type_layer_tysh(ly, font_ps_name(fp),
+                                                 text_w=img.width)
                 except Exception as exc:
                     print(f"  warning: text layer {name} -> TySh failed: {exc}",
                           file=sys.stderr)