feat: add scenarios list page with metrics and quick actions

- Introduced a new template for listing scenarios associated with a project.
- Added metrics for total, active, draft, and archived scenarios.
- Implemented quick actions for creating new scenarios and reviewing project overview.
- Enhanced navigation with breadcrumbs for better user experience.

refactor: update Opex and Profitability templates for consistency

- Changed titles and button labels for clarity in Opex and Profitability templates.
- Updated form IDs and action URLs for better alignment with new naming conventions.
- Improved navigation links to include scenario and project overviews.

test: add integration tests for Opex calculations

- Created new tests for Opex calculation HTML and JSON flows.
- Validated successful calculations and ensured correct data persistence.
- Implemented tests for currency mismatch and unsupported frequency scenarios.

test: enhance project and scenario route tests

- Added tests to verify scenario list rendering and calculator shortcuts.
- Ensured scenario detail pages link back to the portfolio correctly.
- Validated project detail pages show associated scenarios accurately.

models/project.py

@@ -6,7 +6,7 @@ from typing import TYPE_CHECKING, List
 from .enums import MiningOperationType, sql_enum
 from .profitability_snapshot import ProjectProfitability
 from .capex_snapshot import ProjectCapexSnapshot
-from .processing_opex_snapshot import ProjectProcessingOpexSnapshot
+from .opex_snapshot import ProjectOpexSnapshot
 
 from sqlalchemy import DateTime, ForeignKey, Integer, String, Text
 from sqlalchemy.orm import Mapped, mapped_column, relationship
@@ -68,11 +68,11 @@ class Project(Base):
         order_by=lambda: ProjectCapexSnapshot.calculated_at.desc(),
         passive_deletes=True,
     )
-    processing_opex_snapshots: Mapped[List["ProjectProcessingOpexSnapshot"]] = relationship(
-        "ProjectProcessingOpexSnapshot",
+    opex_snapshots: Mapped[List["ProjectOpexSnapshot"]] = relationship(
+        "ProjectOpexSnapshot",
         back_populates="project",
         cascade="all, delete-orphan",
-        order_by=lambda: ProjectProcessingOpexSnapshot.calculated_at.desc(),
+        order_by=lambda: ProjectOpexSnapshot.calculated_at.desc(),
         passive_deletes=True,
     )
 
@@ -93,12 +93,12 @@ class Project(Base):
         return self.capex_snapshots[0]
 
     @property
-    def latest_processing_opex(self) -> "ProjectProcessingOpexSnapshot | None":
-        """Return the most recent processing opex snapshot, if any."""
+    def latest_opex(self) -> "ProjectOpexSnapshot | None":
+        """Return the most recent opex snapshot, if any."""
 
-        if not self.processing_opex_snapshots:
+        if not self.opex_snapshots:
             return None
-        return self.processing_opex_snapshots[0]
+        return self.opex_snapshots[0]
 
     def __repr__(self) -> str:  # pragma: no cover - helpful for debugging
         return f"Project(id={self.id!r}, name={self.name!r})"