feat: 5207 - new "My proofs" and "Proof" pages

New files:
* `price_proof_page.dart`: Full page display of a proof.
* `prices_proofs_page.dart`: Page that displays the latest proofs of the current user.

Impacted files:
* `app_en.arb`: added 3 labels for "my proofs"
* `app_fr.arb`: added 3 labels for "my proofs"
* `price_data_widget.dart`: instead of a web app link, we open the new "my proof" page
* `user_preferences_account.dart`: added a link to open the new "my proofs" page

packages/smooth_app/lib/l10n/app_en.arb

@@ -1709,6 +1709,27 @@
             }
         }
     },
+    "prices_proofs_list_length_one_page": "{count,plural, =0{No proof yet} =1{Only one proof} other{All {count} proofs}}",
+    "@prices_proofs_list_length_one_page": {
+        "description": "Number of proofs for one-page result",
+        "placeholders": {
+            "count": {
+                "type": "int"
+            }
+        }
+    },
+    "prices_proofs_list_length_many_pages": "Latest {pageSize} proofs (total: {total})",
+    "@prices_proofs_list_length_many_pages": {
+        "description": "Number of proofs for one-page result",
+        "placeholders": {
+            "pageSize": {
+                "type": "int"
+            },
+            "total": {
+                "type": "int"
+            }
+        }
+    },
     "prices_users_list_length_many_pages": "Top {pageSize} contributors (total: {total})",
     "@prices_users_list_length_many_pages": {
         "description": "Number of users for one-page result",
@@ -1813,6 +1834,10 @@
     "@user_search_prices_title": {
         "description": "User prices: list tile title"
     },
+    "user_search_proofs_title": "My proofs",
+    "@user_search_proofs_title": {
+        "description": "User proofs: list tile title"
+    },
     "user_any_search_prices_title": "Contributor prices",
     "@user_any_search_prices_title": {
         "description": "User prices (everybody except me): list tile title"

packages/smooth_app/lib/l10n/app_fr.arb

@@ -1711,6 +1711,27 @@
             }
         }
     },
+    "prices_proofs_list_length_one_page": "{count,plural, =0{Aucune preuve} =1{Une seule preuve} other{Toutes les {count} preuves}}",
+    "@prices_proofs_list_length_one_page": {
+        "description": "Number of proofs for one-page result",
+        "placeholders": {
+            "count": {
+                "type": "int"
+            }
+        }
+    },
+    "prices_proofs_list_length_many_pages": "{pageSize} preuves les plus récentes (total : {total})",
+    "@prices_proofs_list_length_many_pages": {
+        "description": "Number of proofs for one-page result",
+        "placeholders": {
+            "pageSize": {
+                "type": "int"
+            },
+            "total": {
+                "type": "int"
+            }
+        }
+    },
     "prices_users_list_length_many_pages": "Top {pageSize} contributeurs (total : {total})",
     "@prices_users_list_length_many_pages": {
         "description": "Number of users for one-page result",
@@ -1810,6 +1831,10 @@
     "@user_search_prices_title": {
         "description": "User prices: list tile title"
     },
+    "user_search_proofs_title": "Mes preuves",
+    "@user_search_proofs_title": {
+        "description": "User proofs: list tile title"
+    },
     "user_any_search_prices_title": "Prix d'un contributeur",
     "@user_any_search_prices_title": {
         "description": "User prices (everybody except me): list tile title"

packages/smooth_app/lib/pages/preferences/user_preferences_account.dart

@@ -20,6 +20,7 @@ import 'package:smooth_app/pages/preferences/user_preferences_page.dart';
 import 'package:smooth_app/pages/prices/get_prices_model.dart';
 import 'package:smooth_app/pages/prices/price_user_button.dart';
 import 'package:smooth_app/pages/prices/prices_page.dart';
+import 'package:smooth_app/pages/prices/prices_proofs_page.dart';
 import 'package:smooth_app/pages/prices/prices_users_page.dart';
 import 'package:smooth_app/pages/product/common/product_query_page_helper.dart';
 import 'package:smooth_app/pages/user_management/login_page.dart';
@@ -227,6 +228,15 @@ class UserPreferencesAccount extends AbstractUserPreferences {
         CupertinoIcons.money_dollar_circle,
         myCount: _getPricesCount(owner: ProductQuery.getWriteUser().userId),
       ),
+      _getListTile(
+        appLocalizations.user_search_proofs_title,
+        () async => Navigator.of(context).push(
+          MaterialPageRoute<void>(
+            builder: (BuildContext context) => const PricesProofsPage(),
+          ),
+        ),
+        Icons.receipt,
+      ),
       _getListTile(
         appLocalizations.all_search_prices_latest_title,
         () async => Navigator.of(context).push(

packages/smooth_app/lib/pages/prices/price_data_widget.dart

@@ -3,10 +3,10 @@ import 'package:flutter_gen/gen_l10n/app_localizations.dart';
 import 'package:intl/intl.dart';
 import 'package:openfoodfacts/openfoodfacts.dart';
 import 'package:smooth_app/generic_lib/design_constants.dart';
-import 'package:smooth_app/helpers/launch_url_helper.dart';
 import 'package:smooth_app/pages/prices/emoji_helper.dart';
 import 'package:smooth_app/pages/prices/get_prices_model.dart';
 import 'package:smooth_app/pages/prices/price_button.dart';
+import 'package:smooth_app/pages/prices/price_proof_page.dart';
 import 'package:smooth_app/pages/prices/price_user_button.dart';
 import 'package:smooth_app/pages/product/common/product_query_page_helper.dart';
 import 'package:smooth_app/query/product_query.dart';
@@ -99,13 +99,14 @@ class PriceDataWidget extends StatelessWidget {
         if (price.proof?.filePath != null)
           PriceButton(
             iconData: Icons.image,
-            onPressed: () async => LaunchUrlHelper.launchURL(
-              price.proof!
-                  .getFileUrl(
-                    uriProductHelper: ProductQuery.uriProductHelper,
-                  )
-                  .toString(),
-            ),
+            onPressed: () async => Navigator.push<void>(
+              context,
+              MaterialPageRoute<void>(
+                builder: (BuildContext context) => PriceProofPage(
+                  price.proof!,
+                ),
+              ),
+            ), // PriceProofPage
           ),
       ],
     );

packages/smooth_app/lib/pages/prices/price_proof_page.dart

@@ -0,0 +1,45 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_gen/gen_l10n/app_localizations.dart';
+import 'package:intl/intl.dart';
+import 'package:openfoodfacts/openfoodfacts.dart';
+import 'package:smooth_app/helpers/launch_url_helper.dart';
+import 'package:smooth_app/query/product_query.dart';
+import 'package:smooth_app/widgets/smooth_app_bar.dart';
+import 'package:smooth_app/widgets/smooth_scaffold.dart';
+
+/// Full page display of a proof.
+class PriceProofPage extends StatelessWidget {
+  const PriceProofPage(
+    this.proof,
+  );
+
+  final Proof proof;
+
+  @override
+  Widget build(BuildContext context) {
+    final AppLocalizations appLocalizations = AppLocalizations.of(context);
+    final DateFormat dateFormat =
+        DateFormat.yMd(ProductQuery.getLocaleString()).add_Hms();
+    return SmoothScaffold(
+      appBar: SmoothAppBar(
+        title: Text(appLocalizations.prices_proof_subtitle),
+        subTitle: Text(dateFormat.format(proof.created)),
+        actions: <Widget>[
+          IconButton(
+            tooltip: appLocalizations.prices_app_button,
+            icon: const Icon(Icons.open_in_new),
+            onPressed: () async => LaunchUrlHelper.launchURL(_getUrl()),
+          ),
+        ],
+      ),
+      body: Image(
+        image: NetworkImage(_getUrl()),
+        fit: BoxFit.cover,
+      ),
+    );
+  }
+
+  String _getUrl() => proof
+      .getFileUrl(uriProductHelper: ProductQuery.uriProductHelper)
+      .toString();
+}