feat(gmd-plugin): add Check and Update workflow, batch Clip Project Layers tool, and submenu redesign

[velascojasper0]

Summary

Redesigns the Gemma menu structure, introduces the Check and Update boundary management dialog with a 3-step chronological audit/repair/UPSERT workflow, and adds 3 standalone Processing algorithms (Scan Geometry Errors, Repair Polygon Geometries, and Clip Project Layers by Extent) under the GMD Toolkits group.

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Key Changes

1. Check and Update Boundary Dialog (check_and_update_dialog.py)

• Georeferencing: Direct launcher for QGIS's built-in Georeferencer tool via QAction lookup.
• Geometry Check & Repair (Chronological Workflow):
  • Step 1 (Scan): Scans polygon layer defects and populates an interactive QTableWidget table (FID, Layer, Error Type, Description, Auto-fixable status). Double-clicking any row zooms the QGIS map canvas directly to that error location point.
  • Step 2 (Repair): Reconstructs invalid polygon geometries using the multi-pass GMD repair engine. Multi-selecting table rows selectively repairs only highlighted features.
  • Step 3 (UPSERT): Merges clean repaired geometries back into the original dataset to produce a complete updated polygon layer (Updated_<layer_name>).
• Updating Metadata: Structured placeholder interface for upcoming PSGC metadata tools.

2. GMD Toolkits Processing Algorithms

Registered under the GMD Toolkits (gmdtoolkits) Processing group:

• clip_project_layers.py (clipprojectlayers): Batch clips multiple vector layers against a target administrative boundary polygon (e.g. EA or Barangay mask) with optional buffer margins and exports clean GeoPackages (*_clipped.gpkg).
• scan_geometry_errors.py (scangeometryerrors): Audits polygon vector layers for Null, Empty, GEOS Invalid, Self-Intersections, Wrong Type, and Duplicates, outputting an Error Point Layer.
• repair_geometry_errors.py (repairpolygongeometries): Reconstructs defective polygon geometries via line extraction, face polygonization, candidate face union, micro-spike grid snapping, and native QGIS fixgeometries.

3. Submenu Redesign & Icons

• Reorganized menu actions under Gemma into 3 submenus: Updating of Boundaries, EA Delineation, and Others.
• Added clean 2D vector SVG icons: clip_layers.svg, scan_errors.svg, and repair_geom.svg.

4. User Guide Documentation

• Created user guides: check-and-update.md, clip-project-layers.md, scan-geometry-errors.md, and repair-polygon-geometries.md.
• Updated getting-started.md and synced geometry-repair-toolkit.md.

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Verification

• Verified the 3-step Scan → Repair → UPSERT workflow in QGIS 3.x.
• Verified interactive table multi-selection, map canvas zoom on double-click, and complete dataset output generation.
• Verified batch vector clipping in Clip Project Layers by Extent against buffered mask boundaries.
• Confirmed 0 Python compilation errors across all modified/created files.

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Project	Deployment	Actions	Updated (UTC)
gemma-plugin	Ready	Preview	Jul 30, 2026 10:08am