[ndonkoHenri]

Fixes #6994.

flet build skips reinstalling the app's packages (--skip-site-packages) when a hash of the package arguments hasn't changed since the last build. Two holes in that check made builds silently ship the wrong packages:

• requirements.txt edits were invisible. Only the file's path is in the package arguments (pip reads the file itself), and its contents were added to the hash only under -vv. Adding or changing a dependency kept the previous build's packages. Projects with dependencies in pyproject.toml weren't affected, since each dependency is its own argument.
• site-packages was never checked. If build/site-packages was deleted while build/.hash stayed (for example a CI cache restoring one but not the other), pip was still skipped and the app shipped without any third-party packages, failing at import.

Changes:

• read_requirements_file_text() (flet_cli/utils/project_dependencies.py) returns the text of requirements.txt plus the files it includes with -r/--requirement or -c/--constraint, resolved relative to the including file. URLs and missing files are skipped, and files that include each other are read once. Its output always goes into the hash; -vv now only controls logging it.
• _site_packages_missing() (build_base.py): pip is skipped only when the directory serious_python installs into exists and isn't empty: build/site-packages on native platforms, build/flutter/build/site-packages on web.

Testing

Three consecutive builds of a requirements.txt app (flet only), unmodified flet-1.1.0 CLI vs this branch:

Step	flet-1.1.0 (web)	This branch (web and macOS)
1. Build	pip runs	pip runs
2. Add tabulate to requirements.txt, rebuild	pip skipped, tabulate missing	pip runs, tabulate installed
3. Delete site-packages, rebuild	pip skipped, app has no packages	pip reinstalls everything
4. Rebuild with no changes		pip skipped (cache still works)

New unit tests cover read_requirements_file_text() (include spellings, nesting, cycles, URLs/missing files, editing only an included file). The flet-cli suite passes.

Summary by Sourcery

Make flet build reliably refresh application packages when dependency files or cached package artifacts change.

Bug Fixes:

• Ensure flet build reinstalls packages when requirements.txt or its included files change.
• Restore missing or empty site-packages before completing a build instead of relying solely on the dependency hash.

Enhancements:

• Add requirements-file content tracking for nested requirement and constraint includes, while preserving build caching when dependencies and artifacts are unchanged.

Tests:

• Add coverage for requirements-file includes, cycles, environment-variable paths, URLs, missing files, and dependency edits.
• Add coverage for detecting missing packages across native, web, Android, iOS, and platform-specific architectures.

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