attachmentToolLoadingLabels property
Rich loading label for the JIT attachment tools (list_attachments,
attachment_outline, attachment_read, attachment_grep, attachment_search),
derived from TOOL_USE_START's typeDetails.toolArgs (e.g. "Reading
report.pdf (lines 1-200)"). Keyed by tool name, same as
activeToolLoadings. Falls back to a generic per-tool label when args
aren't known yet (TOOL_PENDING).
Implementation
final RxMap<String, String> attachmentToolLoadingLabels =
<String, String>{}.obs;