V4.5 Complete - Enhanced trancription context, added option to restranscribe source under different models.

docs/ui/pages/sources.md

@@ -30,14 +30,20 @@ The list accepts optional `document_id` and `job_id` query parameters. Document
 
 - The heading shows page number, upload name, and Source ID.
 - **Back to Sources** returns to the global list.
+- **Retranscribe Source** opens Create Processing Job with this Source and its Document locked.
 - **Delete Source** opens the guarded delete route.
 - Previous and Next navigate only among Sources belonging to the same Document in page order; unavailable boundary actions are disabled.
 - The media viewer resolves the stored Source path through the configured upload root.
-- Transcription Text is read-only and prefers the latest JobSource transcription, then the Source projection.
+- Transcription Text is read-only and displays the preferred machine projection, with a legacy latest-JobSource
+  fallback only when no Source projection exists.
 - Editable Revision is seeded from an existing revision or the machine transcription.
 - Source Metadata shows upload name, stored filename, page number, Document Name, Document ID, and stored path. Source ID appears in the page-header subtitle.
 - SourceJob Metadata shows latest status, Job ID, execution time, provider, model, prompt, and failure detail.
 - Revision Logistics shows revised state, last-revised time, and upload time.
+- Candidate Machine Transcriptions remains compact until a candidate is expanded, then compares it with the preferred
+  machine result and requires confirmation before **Use this transcription**.
+- Candidate promotion does not alter a human revision. Empty states distinguish no machine result from no candidates.
+- An orientation-normalized artifact appears in evidence only when recognized metadata required a physical rotation.
 
 ## Provider Evidence
 
@@ -47,6 +53,7 @@ The list accepts optional `document_id` and `job_id` query parameters. Document
 - Historical `raw_api_response` values are labeled as OpenRouter SDK response snapshots.
 - Missing evidence has an explicit empty state.
 - Historical executions explicitly state that exact transport evidence was not captured.
+- Quality warning artifacts remain attached to their machine attempt and are not recomputed during page rendering.
 - **Export Evidence** downloads a versioned package containing source identity, attempts, artifacts, relationships,
   schema versions, and integrity digests without source binaries, credentials, or machine-local source paths.
 
@@ -71,6 +78,7 @@ The list accepts optional `document_id` and `job_id` query parameters. Document
 - List columns and alignments match this contract and omit Stored Filename.
 - Previous/next navigation never crosses Document boundaries.
 - Detail keeps machine output read-only and human revision separately editable.
+- Retranscription, candidate comparison, warnings, and explicit promotion preserve every prior attempt.
 - Empty, failed, and missing-evidence states remain explicit.
 - JSON evidence is readable without being mislabeled as native transport evidence.
 - Delete cannot remove a Source with processing-history links.