* 🐛 Fix tokens source label truncation and missing translations
The tokens source file name always showed, even for the current file,
and long names wrapped onto a second line instead of truncating
because the header used flex-wrap and overflow-wrap: break-word
instead of single-line ellipsis.
Show the source row unconditionally (it now displays "This file" when
the source is the current file, matching the connected-library case),
truncate the file name to one line with an ellipsis, and only attach a
tooltip with the full name when the text is actually truncated.
Replace the hardcoded UI strings with translated ones and add their
English and Spanish entries.
AI-assisted-by: claude-sonnet-5
* 🐛 Remove redundant effect dependency in tokens source
file-name-truncated? was listed as a dependency of the with-effect
that checks and observes label truncation, even though it isn't
read inside the effect body. Since the effect itself flips that
state via check-file-name-truncated, including it as a dependency
caused the ResizeObserver to be needlessly disconnected and
reconnected on every truncation change.
AI-assisted-by: claude-sonnet-5