renderer-stats.ts and renderer-archive.ts each had their own byte-size formatter (formatBytesForStats / formatBytesForArchive). The two were textually identical: both handle the B -> KB -> MB -> GB -> TB ladder with the same toFixed precision and return '0 B' for non-finite / zero / negative input.
Hoisted to renderer-shared.ts as plain formatBytes. Removed both per-file copies and renamed all 14 call sites across the two modules. The two narrower variants in renderer-settings.ts (formatBytesForMetrics — caps at GB) and renderer.ts (formatBytesRenderer — caps at GB, less protection) stay file-scoped because they have different scale/protection semantics for their specific contexts (runtime metrics + download progress, which never reach TB).
Continues the renderer-shared consolidation from 4.6.127 (applyHtml/escapeHtml).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>