…rl -O

curl -O uses the URL path as the saved filename, so percent-encoded
characters (e.g. %20, %2B, %28) stay encoded in the output file.

Now generates separate 'curl -o realname url' for each file joined
with &&, ensuring files are saved with their actual names.

curl -J (Content-Disposition) cannot create files with non-ASCII characters
on Windows because it interprets the header bytes using the console code page.
Changed to curl -o filename url format where the shell passes the
filename directly to the OS, correctly handling Unicode on all platforms.
Also added tests for UTF-8 filenames and double-quote escaping.

encodeRFC3986URIComponent calls decodeURIComponent first, which throws
URIError on filenames containing a literal percent sign (e.g. '100% done.txt')
because '%' followed by non-hex chars is not a valid escape sequence.

Replaced with inline encodeURIComponent() + parentheses encoding directly
on the raw filename. Added test for literal percent sign in filenames.

curl command now uses brace expansion for compact URL:
  curl -o file1 -o file2 baseUrl{/encoded1,/encoded2}

This combines:
- {} brace expansion in the URL (compact, one URL for all files)
- -o flags with real filenames (handles UTF-8 correctly via shell)

…ren)

New FE test for 'Media (+)#9) ano' verifying correct URL encoding in brace
expansion and real filename in -o flag.

curl URL globbing ({}) does NOT support per-file -o flags. When using
  curl -o f1 -o f2 url{/a,/b}
curl maps the -o flags to URL arguments, not to globbed expansions,
resulting in 'Got more output options than URLs' and only one file saved.

Changed to separate -o + URL pairs per file:
  curl -o file1 url/file1 -o file2 url/file2

Updated all 12 test expectations to match.

Replace inline command display with a centered NgbModal (size: lg) that
shows the curl command in a scrollable pre block. Includes a copy-to-clipboard
button with visual feedback (checkmark + 'Copied!' for 2s).

- Added NgbModal injection and openCommandModal()/copyCommand() methods
- Removed old isCommandLineVisible toggle and #command-div hover styles
- Added i18n keys for en, cs, de (copy/copied/close)
- Updated spec to import NgbModalModule