fix(labs): never present a converted reading's printed range in the wrong unit

A converted reading's bounds move with its value, but the printed range text
stays in the unit the report used, and every reader preferred that text: the
list showed "Report range 3.9 to 5.5" beside 100.9 mg/dL, and the doctor
report and the FHIR referenceRange.text did the same. The text is still
stored verbatim. The range resolver now takes the reading's sourceUnit (as a
required field, so no reader can forget to select it) and, for a converted
reading, leaves the window's text empty so every surface states the converted
bounds in the marker's unit, and hands the printed text over separately with
its unit. The lab DTO carries it as printedReferenceText, and the note beside
a reading shows it as "as printed in mmol/L: ...".

docs/api/openapi.yaml

@@ -67435,6 +67435,10 @@ components:
           anyOf:
             - type: string
             - type: "null"
+        printedReferenceText:
+          anyOf:
+            - type: string
+            - type: "null"
         referenceOrigin:
           $ref: "#/components/schemas/LabReferenceRangeOrigin"
         referenceDivergesFromCatalog:
@@ -67469,6 +67473,7 @@ components:
         - sourceReferenceLow
         - sourceReferenceHigh
         - sourceReferenceText
+        - printedReferenceText
         - referenceOrigin
         - referenceDivergesFromCatalog
         - takenAt
@@ -67494,9 +67499,12 @@ components:
         catalog band state different limits — a surface showing only one of the two is showing a partial answer. The
         client renders these values and never recomputes the range. `converted` is true when the stored `value` was
         converted into the marker's `unit` from another unit; `sourceValue` and `sourceUnit` are then what the report
-        printed (full precision, round for display), and the report's own window was converted with it. A reading stored
-        as stated has `converted: false` and two nulls. The encrypted note is never echoed in list rows; `hasNote` flags
-        its presence and the single-resource GET returns the decrypted `note`.
+        printed (full precision, round for display), and the report's own window was converted with it:
+        `sourceReferenceLow` / `sourceReferenceHigh` are then in the marker's `unit`. The printed range text is not
+        converted and stays in `sourceUnit`, so for a converted reading `sourceReferenceText` is null and the verbatim
+        text is in `printedReferenceText` instead, never mixed with the converted numbers. A reading stored as stated
+        has `converted: false`, two nulls and a null `printedReferenceText`. The encrypted note is never echoed in list
+        rows; `hasNote` flags its presence and the single-resource GET returns the decrypted `note`.
     LabReferenceRangeOrigin:
       type: string
       enum:
@@ -67613,6 +67621,10 @@ components:
           anyOf:
             - type: string
             - type: "null"
+        printedReferenceText:
+          anyOf:
+            - type: string
+            - type: "null"
         referenceOrigin:
           $ref: "#/components/schemas/LabReferenceRangeOrigin"
         referenceDivergesFromCatalog:
@@ -67649,6 +67661,7 @@ components:
         - sourceReferenceLow
         - sourceReferenceHigh
         - sourceReferenceText
+        - printedReferenceText
         - referenceOrigin
         - referenceDivergesFromCatalog
         - takenAt
@@ -67938,6 +67951,10 @@ components:
           anyOf:
             - type: string
             - type: "null"
+        printedReferenceText:
+          anyOf:
+            - type: string
+            - type: "null"
         referenceOrigin:
           type: string
           enum:
@@ -67981,6 +67998,7 @@ components:
         - sourceReferenceLow
         - sourceReferenceHigh
         - sourceReferenceText
+        - printedReferenceText
         - referenceOrigin
         - referenceDivergesFromCatalog
         - takenAt
@@ -67992,7 +68010,8 @@ components:
       additionalProperties: false
       description: A written reading. Its reference window resolves exactly as it does on `/api/labs` — see `LabResult`.
         `converted`, `sourceValue` and `sourceUnit` say when the row's unit was converted into its marker's and what the
-        report printed.
+        report printed; for a converted row the printed range text is in `printedReferenceText` (in `sourceUnit`) and
+        `sourceReferenceText` is null.
     AiRunEnvelope:
       type: object
       properties: