Let the AI-consent card grant again after a withdrawal

POST /api/consent/ai/web now accepts an optional { intent } body. Without
one (the AI-settings mount heal) a standing revocation still blocks the
mint; intent "affirmative" is the user's own consent act and may
supersede an earlier revocation, exactly as a first grant would. The
consent card offers the explicit grant control whenever consent does not
stand, and the audit row records which intent minted the receipt.

The document auto-read opt-in already declared "affirmative" on enable;
the settings-mount heal posts no body. Both stay as they are.

docs/api/openapi.yaml

@@ -8904,10 +8904,24 @@ paths:
       tags:
         - Consent
       summary: Grant web AI consent (idempotent ai_full)
-      description: Mint an `ai_full` consent receipt for the calling web user if none is active; a no-op when one already
-        exists. Mirrors the iOS master grant; the web AI-settings surface calls this on mount so existing web accounts
-        on a shared-key deployment gain a receipt without a re-consent step. Revocation flows through DELETE
-        /api/consent/ai/latest.
+      description: "Mint an `ai_full` consent receipt for the calling web user if none is active; a no-op when one already
+        exists. Mirrors the iOS master grant. Without a body (the mount heal) it grants only to an account with no
+        consent history, so a revocation stands until the user grants again; with `intent: \"affirmative\"` (the
+        explicit grant control) it records the user's own consent act, which may supersede an earlier revocation.
+        Revocation flows through DELETE /api/consent/ai/latest."
+      requestBody:
+        required: false
+        content:
+          application/json:
+            schema:
+              type: object
+              properties:
+                intent:
+                  default: heal
+                  type: string
+                  enum:
+                    - heal
+                    - affirmative
       responses:
         "200":
           description: Grant outcome.