Say which camera profile a photograph renders through, and offer to copy it

The info panel gains a line under the lens: "Adobe Standard · in the
file", the .dcp it came from, "· off" when the photographer switched it
off, or "No camera profile · matrix only" — the ordinary case for a
CR2, worded as a fact rather than a failure. A DNG whose embedded
profile may be copied, for a body with no installed profile, also gets
"Use this profile for every Canon EOS 6D →", which saves it into the
profiles directory; the body's CR2s render through it from their next
decode.

The profiles directory is <data>/profiles, read at start-up on desktop
and Android before anything decodes. The library open path never set
the lens line; it now sets both. Labels: Camera Profile, Use Profile,
Look Amount.

ui/dr-ui/ui/develop.slint

@@ -383,10 +383,51 @@ export global Capture {
     /// same kind of thing as the body and the exposure, and it wants reading
     /// once on opening rather than hunting for under a group filter.
     in property <string> lens;
+    /// TRACES: FR-DEV-3e
+    /// The camera profile the photograph renders through, and where it was
+    /// found — or that there is none (D20). A fact about the file and the
+    /// installed profiles, read once on opening, as the lens line is.
+    in property <string> profile;
     in property <string> exposure;
     in property <string> dimensions;
 }
 
+/// TRACES: FR-DEV-3e
+/// The one action the info panel offers: saving the camera profile embedded
+/// in this file for every photograph from the same body (D20).
+///
+/// A global of its own because `Capture` only reports and carries no
+/// callback. `offer` is the wording, naming the body; empty when there is
+/// nothing to offer, which is every file but a DNG whose profile may be
+/// copied and is not installed yet.
+export global ProfileOffer {
+    in property <string> offer;
+    callback adopt();
+}
+
+// The offer as a line of text that acts, rather than a button: a button
+// does not wrap, and a label naming a camera is long enough to widen the
+// whole column.
+component OfferLine inherits Rectangle {
+    in property <string> text;
+    callback clicked();
+    accessible-role: button;
+    accessible-label: root.text;
+    accessible-action-default => { root.clicked(); }
+    height: line.preferred-height;
+
+    line := Caption {
+        width: 100%;
+        text: root.text + " →";
+        wrap: word-wrap;
+        emphasised: touch.has-hover;
+    }
+    touch := TouchArea {
+        mouse-cursor: pointer;
+        clicked => { root.clicked(); }
+    }
+}
+
 // Capture metadata. Read-only; the adjustment controls live in AdjustPanel,
 // which is generated from pipeline capabilities rather than written here.
 //
@@ -424,6 +465,17 @@ export component InfoPanel inherits Rectangle {
             wrap: word-wrap;
         }
 
+        Caption {
+            text: Capture.profile;
+            visible: Capture.profile != "";
+            wrap: word-wrap;
+        }
+
+        if ProfileOffer.offer != "": OfferLine {
+            text: ProfileOffer.offer;
+            clicked => { ProfileOffer.adopt(); }
+        }
+
         Caption { text: Capture.dimensions; }
     }
 }