feat(union): ✨ improve file union workflows

[thorstenfoltz]

• ✨ Add folder-level cloud union with recursive options and safe file limits for large listings.
• 🧵 Keep large union selections responsive with background loading and progress feedback.
• 🎯 Add marquee selection across local and cloud trees for faster bulk file selection.
• 💾 Preserve shared input formats, safer Save As suggestions, and cleaner generated result tab handling.
• 🛡️ Preserve text document whitespace and align JSON tree virtualization for more accurate previews.
• 🌐 Localize new union actions and refresh documentation for the updated workflows.
• 🔁 Make AUR publishing retries safer after transient SSH failures.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ BASH	bash-exec	5		0	0	0.01s
✅ BASH	shellcheck	5		0	0	0.22s
✅ BASH	shfmt	5		0	0	0.01s
✅ DOCKERFILE	hadolint	1		0	0	0.07s
✅ JSON	jsonlint	4		0	0	0.09s
✅ JSON	prettier	4		0	0	0.34s
✅ JSON	v8r	4		0	0	3.24s
✅ MARKDOWN	markdownlint	132		0	0	3.23s
✅ MARKDOWN	markdown-table-formatter	132		0	0	2.24s
✅ REPOSITORY	validate-branch-name	yes		no	no	0.01s
✅ REPOSITORY	gitleaks	yes		no	no	8.32s
✅ REPOSITORY	ls-lint	yes		no	no	0.02s
✅ REPOSITORY	secretlint	yes		no	no	7.09s
✅ REPOSITORY	semgrep	yes		no	no	24.32s
✅ REPOSITORY	trivy	yes		no	no	3.91s
✅ SPELL	lychee	149		0	0	3.11s
✅ SPELL	proselint	133		0	0	86.95s
✅ YAML	prettier	12		0	0	0.9s
✅ YAML	v8r	11		0	0	5.36s
✅ YAML	yamllint	12		0	0	1.1s

See detailed reports in MegaLinter artifacts

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