feat: show other-folder markers in distinct colors on timeline

Subprofile/subfolder exports now appear as colored markers (yellow,
green, blue, purple, orange) with their own numbering, separate from
the main folder's red markers. Each folder gets its own color and
independent sequence numbers.

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

core/db.py

@@ -396,6 +396,44 @@ class ProcessedDB:
             return []
         return self._get_markers_for(filename, profile, export_folder)
 
+    def get_other_folder_markers(self, filename: str, profile: str = "default",
+                                export_folder: str = ""
+                                ) -> dict[str, list[tuple[float, int, str, float]]]:
+        """Return {folder_name: [(start_time, num, path, span), ...]} for
+        markers NOT in export_folder, grouped by their base export folder."""
+        if not self._enabled or not export_folder:
+            return {}
+        rows = self._con.execute(
+            "SELECT start_time, output_path, clip_duration, clip_count, spread"
+            " FROM processed"
+            " WHERE filename = ? AND profile = ? AND scan_export = 0"
+            "   AND output_path NOT LIKE ?"
+            " ORDER BY start_time",
+            (filename, profile, export_folder.rstrip("/") + "/%"),
+        ).fetchall()
+        by_folder: dict[str, list] = {}
+        for t, p, dur, cnt, spr in rows:
+            parts = p.split("/")
+            for i, part in enumerate(parts):
+                if part.startswith("vid_"):
+                    folder = "/".join(parts[:i])
+                    break
+            else:
+                folder = os.path.dirname(os.path.dirname(p))
+            by_folder.setdefault(folder, []).append((t, p, dur, cnt, spr))
+        result: dict[str, list[tuple[float, int, str, float]]] = {}
+        for folder, folder_rows in by_folder.items():
+            seen: dict[float, tuple[float, int, str, float]] = {}
+            n = 0
+            for t, p, dur, cnt, spr in folder_rows:
+                if t not in seen:
+                    n += 1
+                    span = (dur or 8.0) + ((cnt or 1) - 1) * (spr or 3.0)
+                    seen[t] = (t, n, p, span)
+            name = os.path.basename(folder)
+            result[name] = list(seen.values())
+        return result
+
     def get_manual_export_groups(self, filename: str, profile: str = "default"
                                 ) -> list[dict]:
         """Return manual (non-scan) export groups for *filename*.