Multi trial allocation tool

[chris263]

Description

This PR adds and improves the Trial Allocation tool for multi-trial field layout planning. It supports interactive trial placement on a grid, saving and loading multi-trial layouts, adding new or existing trials to saved layouts, generating planting tools, and improved augmented row-column design generation.

Main Changes

• Added interactive grid-based trial allocation with trial movement, rotation, directional plotting, borders, unused plots.
• Added multi-trial layout persistence using nd_geolocationprop.value with the multi_trial_layout_json cvterm.
• Added layout retrieval by location, year, and optional season to avoid overlapping allocations at the same site.
• Added saving of new trials into the database from the allocation view, while preserving/fixing already saved trials.
• Added support for including existing experimental trials for the selected location/year and updating their plot coordinates/layout JSON.
• Added curator-only delete actions for trials/layouts.
• Added improved hover information for plots, borders, unused regions, accession names, coordinates, row, and column.
• Added planting map/tool export as .xlsx.
• Added trial allocation graphics for trial area and plot-use summaries.
• Added config-driven season dropdown via available_seasons.
• Renamed user-facing “Treatments List” wording to “Accessions List”.

Design and Workflow Improvements

• Reworked the page title and workflow guidance to better match Breedbase UI conventions.
• Collapsed the Trial Allocation Summary by default.
• Replaced fixed “Number of Trials” input with an Add Trial button.
• Moved plot width/length settings into each trial configuration.
• Added per-trial controls near the grid for direction and rotation.
• Improved handling of saved layouts so existing trials are frozen while new trials can still be added and saved.

Augmented Row-Column Design

• Added/updated augmented row-column support in R/augmented_row_column.R.
• Preserves existing parameter loading and .design output format.
• Keeps check plot placement constrained so checks do not share rows/columns inside blocks.
• Prevents the same check accession from repeating in the same field row or column across blocks.
• Maps temporary treatment placeholders back to original accession names before saving.

closes #4361
closes #4434
closes #4788
closes #4941

Checklist

• Refactoring only
• Documentation only
• Fixture update only
• Bug fix
  • The relevant issue has been closed.
  • Further work is required.
• New feature
  • Relevant tests have been created and run.
  • Data was added to the fixture
    • Data was added via a patch in /t/data/fixture/patches/.
  • User-Facing Change
    • The user manual in /docs has been updated.
  • Any new Perl has been documented using perldoc.
  • Any new JavaScript has been documented using JSDoc.
  • Any new legacy JavaScript has been moved from /js to /js/source/legacy.