Fix fault dip display: retrieve from shapefile data instead of normal vector

[Copilot]

Fault dip values from shapefiles were always displayed as 90° in the Geological Features panel instead of showing the actual shapefile values.

Changes

• Modified FaultFeatureDetailsPanel.__init__() to retrieve dip and pitch from model_manager.faults[fault.name]['data'] (where shapefile values are stored) before falling back to normal vector calculation
• Added unit tests covering data retrieval paths and fallback behavior

Technical Details

Previous implementation:

dip = normal_vector_to_strike_and_dip(fault.fault_normal_vector)[0, 1]
pitch = 0  # hardcoded

New implementation retrieves from stored data:

# Try stored fault data first
dip = None
if model_manager is not None and fault.name in model_manager.faults:
    fault_data = model_manager.faults[fault.name].get('data')
    if fault_data is not None and 'dip' in fault_data.columns and not fault_data.empty:
        dip = fault_data['dip'].mean()

# Fallback to calculation if not available
if dip is None:
    dip = normal_vector_to_strike_and_dip(fault.fault_normal_vector)[0, 1]

The fault normal vector may not reflect the original shapefile dip value, causing the mismatch. This change preserves the original data from update_fault_points() where shapefile fields are mapped to fault data columns.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Fault dip not displayed properly</issue_title>
<issue_description>### What is the bug or the crash?

If a fault has a dip measurement in the shapefile, this value is not copied over to the Geological Features panel Fault Dip (they all display as 90). I think the correct value is used in the model calc, so the Fault Dip text item is probably not (yet?) used.

Steps to reproduce the issue

1. initialise model with fault layer
2. Click on a fault in Geological Feature area,
3. Scroll to Fault Dip text edit box

Versions

QGIS version	3.44.4-Solothurn
QGIS code revision	108203c541e
Libraries
Qt version	5.15.13
Python version	3.12.11
GDAL version	3.11.4 — Eganville
PROJ version	9.7.0
EPSG Registry database version	v12.022 (2025-08-30)
GEOS version	3.13.1-CAPI-1.19.2
SQLite version	3.50.4
PDAL version	2.9.0
PostgreSQL client version	17.3
SpatiaLite version	5.1.0
QWT version	6.3.0
QScintilla2 version	2.14.1
OS version	Windows 10 Version 2009
Active Python plugins
a00_qpip	1.4.2
geochem_plots	0.0.1
geol_qmaps	3.1.5
GeoSubSampler	0.1
loopstructural	v0.1.12
mapswipetool_plugin	1.4
plugin_reloader	0.18
processing_saga_nextgen	1.1.0
qgis-stereonet	0.3.01
sgtool	0.3.01
SRTM-Downloader	3.3.1
tomofast_x_q	0.2.13
db_manager	0.1.20
grassprovider	2.12.99
MetaSearch	0.3.6
processing	2.12.99

Supported QGIS version

• I'm running a supported QGIS version according to the official roadmap.

New profile

• I tried with a new QGIS profile

Additional context

No response</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Fault dip not displayed properly #79

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