Drag & Drop Project selection

[AKostiv8]

Solved Problem (#125)

The old approach used a clunky file browser (shinyFiles) that only worked with local directories. Users had to navigate through server folders to find their .xlsx files with the configuration. This was especially an issue for cloud deployments - users couldn't access their local files at all.

Changes

This PR allows users to upload their entire project as a single .esqapp (another naming of zip) or .zip file with native file picker or just drag and drop. The app extracts the archive, loads all configuration files, and lets users edit everything in the browser. When done, they download the modified project as a new archive.

.esqapp/.zip file structure

Project/
├── ProjectConfiguration.xlsx    <-- required
├── Configurations/              <-- required
│   ├── Applications.xlsx
│   ├── Individuals.xlsx
│   ├── ModelParameters.xlsx
│   ├── Plots.xlsx
│   ├── Populations.xlsx
│   └── Scenarios.xlsx
├── Models/
│   └── Simulations/
│       └── ...
├── Data/
│   ├── esqlabs_dataImporter_configuration.xml  <-- required to load observed data
│   └── TestProject_TimeValuesData.xlsx
└── Results/
│   └── ...

How to Test

1. Take any existing project folder
2. Zip it (make sure ProjectConfiguration.xlsx, Configurattions folder are inside)
3. Or take a test project example from tests/testthat/data/TestProject.esqapp
4. Upload to the app
5. Make some edits
6. Download and check the changes are there

Further steps

1. esqlabsR package should have an export function so users can create .esqapp or .zip bundle e.g:

   exportProjectAsEsqappBundle(projectConfiguration, c("project.esqapp", "project.zip"))

2. Replace Excel config with JSON - move from ProjectConfiguration.xlsx to a simpler ProjectConfiguration.json file that's easier to read and edit.

[nautilus69]

This needs a release or major version.
Tested locally, drag and drop, .zip and .esqapp files are working as expected.
Minor update: When Importing new .esqapp or .zip files, always asking that the project is unsaved even when the project is saved. which I think it is not an issue.

[PavelBal]

PLease wait with merging, I would like to test it in real life for a while.

[AKostiv8]

@PavelBal , Definitely yes, please go ahead and test as much as possible. This is a major update, and it needs thorough testing. We also need support from esqlabsR for the project-bundling functionality, and we should prepare clear communication for current users about the expected app usage flow.