Base Blue AV Envelope page on purple envelope stock, clear hidden answers

Page 3 (Blue AV Envelope Order Form) now shows only when the purple
envelope stock question is answered "KCI's stock" - choosing "My own
stock" skips it, since KCI wouldn't be sourcing envelopes either way.
Falls back to visible if that question was never reached.

Also sets clearInvisibleValues: "onHidden" on the survey so answers to
a question don't linger after the question that revealed it gets
changed back (e.g. flipping "purchase blue AV envelopes?" from Yes to
No no longer leaves the permit/nonprofit-status answers underneath it
in place) - applies to every conditional branch on the form, not just
this one.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/views/Order/continue.asp

@@ -71,6 +71,7 @@
     showQuestionNumbers: "off",
     completeText: "Submit Order",
     checkErrorsMode: "onNextPage",
+    clearInvisibleValues: "onHidden",
     completedHtml: "<h3>Thank you for submitting your order.</h3>",
     pages: [
       {
@@ -115,11 +116,11 @@
           },
           {
             type: "radiogroup", name: "PurplePrintOption",
-            title: "Would you like KCI to print addresses on your purple envelopes or state of Michigan permit only?",
+            title: "Would you like KCI to print voter addresses on your purple envelopes or state of Michigan permit only?",
             visibleIf: "{PurpleWantsQuote} = true",
             isRequired: true,
             choices: [
-              { value: "AddressesAndPermit", text: "Addresses and state of Michigan permit" },
+              { value: "AddressesAndPermit", text: "Voter Addresses and state of Michigan permit" },
               { value: "PermitOnly", text: "State of Michigan permit only" }
             ]
           },
@@ -208,6 +209,7 @@
       {
         name: "blueEnvelope",
         title: "3. Blue AV Envelope Order Form",
+        visibleIf: "{PurpleEnvelopeStock} <> 'OwnStock'",
         elements: [
           {
             type: "boolean", name: "BlueWantsQuote", labelTrue: "Yes", labelFalse: "No",