Overhaul the sync command's human output to use semantic colors and a
cleaner rendering architecture. The changes fall into four areas:
Stage lines: Replace direct finish_stage() calls with an
emit_stage_line/emit_stage_block pattern that clears the spinner first,
then prints static lines via MultiProgress::suspend. Stage icons are
now color-coded green (success) or yellow (warning) via color_icon().
A separate "Status" stage line now appears after Issues, summarizing
work-item status enrichment across all projects.
Sub-rows: Replace the imperative print_issue_sub_rows/print_mr_sub_rows
functions with functional issue_sub_rows(), mr_sub_rows(), and new
status_sub_rows() that return Vec<String>. Project paths use
Theme::muted(), error/failure counts use Theme::warning(), and
separators use the dim middle-dot style. Sub-rows are printed atomically
with their parent stage line to avoid interleaving with spinners.
Summary: In print_sync(), counts now use Theme::info().bold() for visual
pop, detail-line separators are individually styled (dim middle-dot),
and a new "Sync completed with issues" headline appears when any stage
had failures. Document errors and embedding failures are surfaced in
both the doc-parts line and the errors line.
Tests: Full coverage for append_failures, summarize_status_enrichment,
should_print_timings, issue_sub_rows, mr_sub_rows, and status_sub_rows.
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