feat(labs): show a reading's conversion in the scan review and beside the value

Slice 3 of phase 3 of #1095. The scan review no longer treats every reading in
another unit as unwritable. The server tells it which analyte the matched marker
is (markerAnalyteKey on each extracted row); a row whose unit differs but can be
converted starts selected and carries a badge saying what Save will store and
what the report stated ("Saved as 100.9 mg/dL, converted from 5.6 mmol/L"). A
row that cannot be converted keeps the existing blocked badge and error. Save
still sends what the report printed; the server converts, as in slice 2.

The review's duplicate flag also recognises a re-scan of a reading that was
stored converted, by what the report printed, the same rule the commit applies.

A converted reading carries a quiet "converted from 5.6 mmol/L" on the lab list
(row and tile) and the history list (phone and table), so a number nobody typed
can always be traced back to what the report printed.

Strings in all seven locales.

Refs #1095

docs/api/openapi.yaml

@@ -68232,8 +68232,16 @@ components:
             - type: string
             - type: "null"
           description: "The unit the matched marker is tracked in, or null when the marker does not exist yet (it will adopt this
-            row's unit). A row whose `unit` differs from it cannot be committed: the commit skips it with `reason:
-            unit_mismatch`, and the review screen marks it before Save."
+            row's unit). A row whose `unit` differs from it is converted on commit when the marker's analyte is known
+            and the pair is in the unit-conversion registry; otherwise the commit skips it with `reason: unit_mismatch`,
+            and the review screen marks it before Save."
+        markerAnalyteKey:
+          anyOf:
+            - type: string
+            - type: "null"
+          description: The analyte the matched marker is (the unit-conversion registry's key, e.g. `fasting-glucose`), or null
+            when the marker does not exist yet or its name matches none. With `markerUnit` it tells a client whether a
+            row in another unit can be converted on commit.
         duplicateOf:
           anyOf:
             - type: string
@@ -68250,6 +68258,7 @@ components:
         - confidence
         - biomarkerMatch
         - markerUnit
+        - markerAnalyteKey
         - duplicateOf
       additionalProperties: false
       description: "One proposed reading transcribed from the upload. UNTRUSTED model output annotated server-side: