Fix #7274: Add unique CSS class suffix to all selectors in sheet drawings

Previously, when multiple CSS selectors were comma-separated in a rule,
only the last selector received the unique drawing ID suffix. This caused
style conflicts when multiple drawings were placed on the same sheet.

Now all selectors in comma-separated lists receive the unique suffix,
ensuring proper style isolation between drawings.

Example:
Before: .cut.Status-DEMOLISH, .cut.Option-D.d2156 { ... }
After:  .cut.Status-DEMOLISH.d2156, .cut.Option-D.d2156 { ... }

src/bonsai/bonsai/bim/module/drawing/sheeter.py

@@ -341,17 +341,29 @@ class SheetBuilder:
         assert style_data is not None
         text = ""
         brackets_level = 0
+        selector_buffer = ""  # Buffer to accumulate selectors across lines
+
         for l in style_data:
             if l == "{":
                 if brackets_level == 0:
-                    cur_line = text.splitlines()[-1]
-                    text = text[: -len(cur_line)]
+                    # Get all accumulated selector text (may span multiple lines)
+                    # Find where the last rule ended (after last }) or start of text
+                    last_close = text.rfind("}")
+                    if last_close == -1:
+                        selector_text = text
+                        text = ""
+                    else:
+                        selector_text = text[last_close + 1 :]
+                        text = text[: last_close + 1]
+
+                    # Process all selectors (split by comma)
                     css_selectors = []
-                    # making sure cases like "text, tspan" will be
-                    # converted to "text.prefix, tspan.prefix"
-                    for css_selector in cur_line.split(","):
-                        css_selector = f"{css_selector.strip()}.{prefix}"
-                        css_selectors.append(css_selector)
+                    for css_selector in selector_text.split(","):
+                        css_selector = css_selector.strip()
+                        if css_selector:  # Only process non-empty selectors
+                            css_selector = f"{css_selector}.{prefix}"
+                            css_selectors.append(css_selector)
+
                     text += ", ".join(css_selectors) + " "
                 brackets_level += 1
             elif l == "}":