Fix packaged builds: bundle leapp_functions & assets, resolve report assets when frozen

[abrignoni]

Problem

Building the CLI from scripts/pyinstaller/ileapp_macOS.spec on current main produces a broken binary. Two independent bugs, plus a size issue:

1. leapp_functions is not bundled → plugin loader crashes on startup

scripts/artifacts/apple_atx_images.py does:

from leapp_functions.parsers.apple_atx import decode_atx_file

Artifacts are loaded dynamically (plugin_loader.py), so PyInstaller's static analysis never sees leapp_functions and doesn't bundle it. Running the packaged binary:

ModuleNotFoundError: No module named 'leapp_functions.parsers'
[ileapp] Failed to execute script 'ileapp' due to unhandled exception!

This aborts the whole run (the loader imports every artifact at startup).

2. Report assets are resolved from Path.cwd() → no icons in a packaged binary

scripts/report.py loads its Tabler icons and correction JSON with paths relative to the current working directory:

Path.cwd().joinpath("assets/tabler_icons")
get_json_file_content('scripts/data/tabler_icon_correction.json')

That only works when iLEAPP is launched from the repo root. A packaged binary run from anywhere else logs:

Error: JSON file 'scripts/data/tabler_icon_correction.json' not found.
Error: File '.../assets/tabler_icons/home.svg' not found.

and generates a report with missing icons. The three CLI specs also never bundled assets/ at all (the GUI specs already do).

3. Size — unused heavy libs bundled

scipy, matplotlib, and pyarrow are imported by zero iLEAPP files (they come in transitively via pandas). They add a lot to the binary for nothing.

Fix

• scripts/report.py — resolve assets/ and scripts/data/ from sys._MEIPASS when frozen, falling back to cwd from source (no behavior change when run from source). New _base_dir() helper.
• All six specs (ileapp[_macOS/_Linux].spec, ileappGUI[_macOS/_Linux].spec) — add leapp_functions to datas + a hidden import for leapp_functions.parsers.apple_atx, and put the repo root on pathex so analysis can find it.
• CLI specs — also bundle assets/ (the GUI specs already did).
• All six specs — add scipy, matplotlib, pyarrow to excludes.

Testing

Built the macOS CLI (ileapp_macOS.spec) and verified end-to-end:

• Loads all 295 artifacts, including apple_atx_images, with no import error.
• Full parse of a test extraction from an unrelated working directory: report generates with Tabler icons rendered and no missing-asset errors.

The other five specs received the analogous change but were not built in this environment (no Windows/Linux here). They share the identical gaps, so the same fix applies.