#14878: Add FMU well-picks data model (RigWellPathFormations, RimWellFormationsFile/Collection)

Parse depth-based FMU well-pick formations.csv files in RifWellPathFormationReader
and expose them as a project-level RimWellFormationsCollection of RimWellFormationsFile
objects. RigWellPathFormations becomes a value type with top/base MD and TVD depths
per formation, independent from the existing K-layer-index .lyr formation names.

ApplicationLibCode/ProjectDataModel/Formations/RimWellFormationsFile.h

@@ -0,0 +1,69 @@
+/////////////////////////////////////////////////////////////////////////////////
+//
+//  Copyright (C) 2026-     Equinor ASA
+//
+//  ResInsight is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  ResInsight is distributed in the hope that it will be useful, but WITHOUT ANY
+//  WARRANTY; without even the implied warranty of MERCHANTABILITY or
+//  FITNESS FOR A PARTICULAR PURPOSE.
+//
+//  See the GNU General Public License at <http://www.gnu.org/licenses/gpl.html>
+//  for more details.
+//
+/////////////////////////////////////////////////////////////////////////////////
+
+#pragma once
+
+#include "RifWellPathFormationReader.h"
+
+#include "cafPdmField.h"
+#include "cafPdmObject.h"
+
+#include <expected>
+#include <optional>
+
+//==================================================================================================
+/// A single well formations/well picks file (e.g. an FMU formations.csv or a well pick export),
+/// owned by RimWellFormationsCollection. Both RimEnsembleFileSet and RimWellPath can point to an
+/// entry, so the file is only parsed once.
+//==================================================================================================
+class RimWellFormationsFile : public caf::PdmObject
+{
+    CAF_PDM_HEADER_INIT;
+
+public:
+    RimWellFormationsFile();
+
+    void    setFilePath( const QString& filePath );
+    QString filePath() const;
+    QString shortName() const;
+
+    std::expected<void, QString> reload();
+
+    QStringList                          wellNames() const;
+    QStringList                          zoneNames( const QString& wellName ) const;
+    std::optional<RigWellPathFormations> formationsForWell( const QString& wellName ) const;
+
+    static QString normalizedWellName( const QString& wellName );
+
+protected:
+    void fieldChangedByUi( const caf::PdmFieldHandle* changedField, const QVariant& oldValue, const QVariant& newValue ) override;
+    void defineUiOrdering( QString uiConfigName, caf::PdmUiOrdering& uiOrdering ) override;
+    void defineEditorAttribute( const caf::PdmFieldHandle* field, QString uiConfigName, caf::PdmUiEditorAttribute* attribute ) override;
+    void defineUiTreeOrdering( caf::PdmUiTreeOrdering& uiTreeOrdering, QString uiConfigName = "" ) override;
+    void initAfterRead() override;
+
+private:
+    void updateUiTreeName();
+    void updateContentTable();
+
+private:
+    caf::PdmField<caf::FilePath> m_filePath;
+    caf::PdmField<QString>       m_contentTable;
+
+    RifWellPathFormationReader::WellFormations m_wellFormations;
+};