feat: add ability to completely delete a tag

useful because right now tags are auto-detected when an entry is
submitted, which means anything following a hashtag (i.e. things
in URLs, etc) might be mistakenly detected as a tag

ios/Flutter/AppFrameworkInfo.plist

@@ -21,6 +21,6 @@
   <key>CFBundleVersion</key>
   <string>1.0</string>
   <key>MinimumOSVersion</key>
-  <string>11.0</string>
+  <string>12.0</string>
 </dict>
 </plist>

ios/Runner.xcodeproj/project.pbxproj

@@ -214,7 +214,7 @@
 		97C146E61CF9000F007C117D /* Project object */ = {
 			isa = PBXProject;
 			attributes = {
-				LastUpgradeCheck = 1430;
+				LastUpgradeCheck = 1510;
 				ORGANIZATIONNAME = "";
 				TargetAttributes = {
 					331C8080294A63A400263BE5 = {
@@ -451,7 +451,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				SUPPORTED_PLATFORMS = iphoneos;
@@ -579,7 +579,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
@@ -628,7 +628,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				SUPPORTED_PLATFORMS = iphoneos;

ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "1430"
+   LastUpgradeVersion = "1510"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"

lib/context_menus.dart

@@ -1,14 +1,19 @@
+import 'package:flutter/material.dart';
 import 'package:super_context_menu/super_context_menu.dart' as scm;
 
 import 'export_utils.dart';
 import 'model/entry_data.dart';
 import 'model/tag_data.dart';
+import 'widgets/confirmation_modal.dart';
 
 scm.Menu buildTagButtonContextMenu(
+  BuildContext context,
   String tagName,
   PeregrineTag tagInfo,
   Function(String) autoEncryptToggleCallback,
   List<PeregrineEntry> entries,
+  void Function(String) stripTagFromEntriesCallback,
+  void Function(String) deleteTagCallback,
 ) =>
     scm.Menu(
       children: [
@@ -31,6 +36,24 @@ scm.Menu buildTagButtonContextMenu(
             ),
           ],
         ),
+        scm.MenuAction(
+            title: 'Delete Tag',
+            image: scm.MenuImage.icon(Icons.delete),
+            attributes: const scm.MenuActionAttributes(
+              destructive: true,
+            ),
+            callback: () async {
+              final confirmation = await showModalBottomSheet<bool>(
+                context: context,
+                isDismissible: false,
+                builder: (context) => ConfirmationModal(count: tagInfo.count),
+              );
+              // TODO: why is this nullable?
+              if (confirmation != null && confirmation) {
+                stripTagFromEntriesCallback(tagName);
+                deleteTagCallback(tagName);
+              }
+            })
       ],
     );
 

lib/model/entry_data.dart

@@ -78,6 +78,28 @@ class PeregrineEntryList extends StateNotifier<Map<String, PeregrineEntry>> {
     };
     _writeLog();
   }
+
+  void stripTagFromEntries(String tag) {
+    state = state.map((key, value) {
+      if (value.tags.contains(tag)) {
+        return MapEntry(
+            key,
+            PeregrineEntry(
+              date: value.date,
+              input: value.input,
+              isEncrypted: value.isEncrypted,
+              entryType: value.entryType,
+              tags: value.tags.where((x) => x != tag).toList(),
+              mentionedContacts: value.mentionedContacts,
+              ancestors: value.ancestors,
+              descendants: value.descendants,
+            ));
+      } else {
+        return MapEntry(key, value);
+      }
+    });
+    _writeLog();
+  }
 }
 
 class PeregrineEntry extends PretDataclass {

lib/model/tag_data.dart

@@ -62,6 +62,13 @@ class TagsList extends StateNotifier<Map<String, PeregrineTag>> {
     }
     return false;
   }
+
+  void deleteTag(String tag) {
+    state = Map.fromEntries(
+      state.entries.where((x) => x.key != tag),
+    );
+    _writeTags();
+  }
 }
 
 Map<String, PeregrineTag> sortTags(Map<String, PeregrineTag> tags) {

lib/widgets/confirmation_modal.dart

@@ -0,0 +1,62 @@
+import 'package:flutter/material.dart';
+import 'package:pret_a_porter/pret_a_porter.dart';
+
+class ConfirmationModal extends StatelessWidget {
+  final int count;
+
+  const ConfirmationModal({super.key, required this.count});
+
+  @override
+  Widget build(BuildContext context) {
+    return SizedBox(
+      height: 300,
+      child: Center(
+        child: Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: [
+            Text(
+              'Are you sure you want to delete this tag, and remove it from $count entries?',
+              textAlign: TextAlign.center,
+            ),
+            const Padding(
+              padding: EdgeInsets.only(
+                top: PretConfig.defaultElementSpacing,
+              ),
+            ),
+            const Text(
+                'Warning: this is an irreversible + highly destructive action!',
+                textAlign: TextAlign.center,
+                style: TextStyle(color: Colors.red)),
+            const Padding(
+              padding: EdgeInsets.only(
+                top: PretConfig.defaultElementSpacing,
+              ),
+            ),
+            Row(
+              mainAxisAlignment: MainAxisAlignment.center,
+              children: [
+                OutlinedButton(
+                  autofocus: true,
+                  child: const Text('Cancel'),
+                  onPressed: () => Navigator.pop(context, false),
+                ),
+                const Padding(
+                  padding: EdgeInsets.only(
+                    left: PretConfig.defaultElementSpacing,
+                  ),
+                ),
+                OutlinedButton(
+                  style: const ButtonStyle(
+                    backgroundColor: MaterialStatePropertyAll(Colors.red),
+                  ),
+                  onPressed: () => Navigator.pop(context, true),
+                  child: const Text('Delete'),
+                )
+              ],
+            )
+          ],
+        ),
+      ),
+    );
+  }
+}

lib/widgets/sidebar.dart

@@ -77,11 +77,16 @@ class Sidebar extends ConsumerWidget {
                   right: PretConfig.defaultElementSpacing),
               child: ContextMenuWidget(
                 menuProvider: (_) => buildTagButtonContextMenu(
+                  context,
                   tagName,
                   tags[tagName]!,
                   (name) =>
                       ref.read(tagsProvider.notifier).toggleAutoEncrypt(name),
                   ref.watch(filteredListProvider).values.toList(),
+                  (tag) => ref
+                      .read(entryListProvider.notifier)
+                      .stripTagFromEntries(tag),
+                  (tag) => ref.read(tagsProvider.notifier).deleteTag(tag),
                 ),
                 child: PretSidebarButton(
                   color: