feat(assistant): a question opens in the AI assistant chosen, Proton's Lumo by default

Questions asked from the app went to Claude alone. Settings › Assistant
now chooses where they open (decided 2026-10-14): Lumo, the default, by
its guest chat with the question in the address's fragment (Lumo's
`prefill`, which needs no account and reaches no server; the address for
one's own account loses the question when nobody is signed in), ChatGPT,
Claude, Mistral, Perplexity, Duck.ai, Grok, Kagi Assistant, HuggingChat,
or an address of one's own with %s. Each link fills the question in for
the person to send (Perplexity answers at once, Grok asks first); Gemini,
which has no such link, and Copilot, whose stopped working, are left out.
The field names the assistant ("Ask Lumo…"). A device that sent questions
to Claude goes on asking an assistant, now Lumo. Connecting Claude to read
studysets stays as it was.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

halkyon_learn_flutter/lib/l10n/app_localizations.dart

@@ -10047,41 +10047,41 @@ abstract class AppLocalizations {
   /// **'Assistant'**
   String get settingsAssistant;
 
-  /// No description provided for @settingsAskClaude.
+  /// No description provided for @settingsAskAssistant.
   ///
   /// In en, this message translates to:
-  /// **'Ask Claude or search the web'**
-  String get settingsAskClaude;
+  /// **'Ask an AI assistant or search the web'**
+  String get settingsAskAssistant;
 
-  /// No description provided for @settingsAskClaudeSubtitle.
+  /// No description provided for @settingsAskAssistantSubtitle.
   ///
   /// In en, this message translates to:
-  /// **'Off unless you turn it on. Adds a field on Home and a button in the Library, on a studyset and while studying. A question opens in Claude or as a web search, with only the context you choose; nothing is sent from here.'**
-  String get settingsAskClaudeSubtitle;
+  /// **'Off unless you turn it on. Adds a field on Home and a button in the Library, on a studyset and while studying. A question opens in the AI assistant you choose or as a web search, with only the context you choose; nothing is sent from here.'**
+  String get settingsAskAssistantSubtitle;
 
   /// No description provided for @assistantHint.
   ///
   /// In en, this message translates to:
-  /// **'Ask Claude…'**
-  String get assistantHint;
+  /// **'Ask {assistant}…'**
+  String assistantHint(String assistant);
 
   /// No description provided for @assistantHintStudyset.
   ///
   /// In en, this message translates to:
-  /// **'Ask Claude about {title}…'**
-  String assistantHintStudyset(String title);
+  /// **'Ask {assistant} about {title}…'**
+  String assistantHintStudyset(String assistant, String title);
 
   /// No description provided for @assistantHintCard.
   ///
   /// In en, this message translates to:
-  /// **'Ask Claude about this card…'**
-  String get assistantHintCard;
+  /// **'Ask {assistant} about this card…'**
+  String assistantHintCard(String assistant);
 
   /// No description provided for @assistantSend.
   ///
   /// In en, this message translates to:
-  /// **'Ask in Claude'**
-  String get assistantSend;
+  /// **'Ask in {assistant}'**
+  String assistantSend(String assistant);
 
   /// No description provided for @assistantOpen.
   ///
@@ -10098,8 +10098,8 @@ abstract class AppLocalizations {
   /// No description provided for @assistantOpenFailed.
   ///
   /// In en, this message translates to:
-  /// **'Claude couldn\'t be opened.'**
-  String get assistantOpenFailed;
+  /// **'{assistant} couldn\'t be opened.'**
+  String assistantOpenFailed(String assistant);
 
   /// No description provided for @assistantConnectTitle.
   ///
@@ -10206,7 +10206,7 @@ abstract class AppLocalizations {
   /// No description provided for @assistantNotOffered.
   ///
   /// In en, this message translates to:
-  /// **'This instance doesn\'t offer a connector yet. Questions still open in Claude with what they are about.'**
+  /// **'This instance doesn\'t offer a connector yet. Questions still open in the AI assistant you chose, with what they are about.'**
   String get assistantNotOffered;
 
   /// No description provided for @assistantUnreachable.
@@ -10221,7 +10221,7 @@ abstract class AppLocalizations {
   /// **'Try again'**
   String get assistantRetry;
 
-  /// A line of context handed to Claude after the question.
+  /// A line of context handed to the AI assistant after the question.
   ///
   /// In en, this message translates to:
   /// **'Front: {text}'**
@@ -10269,12 +10269,6 @@ abstract class AppLocalizations {
   /// **'Send along'**
   String get assistantContextLabel;
 
-  /// No description provided for @assistantTargetClaude.
-  ///
-  /// In en, this message translates to:
-  /// **'Claude'**
-  String get assistantTargetClaude;
-
   /// No description provided for @assistantTargetWeb.
   ///
   /// In en, this message translates to:
@@ -10287,11 +10281,11 @@ abstract class AppLocalizations {
   /// **'Search the web instead'**
   String get assistantSwitchToWeb;
 
-  /// No description provided for @assistantSwitchToClaude.
+  /// No description provided for @assistantSwitchToAssistant.
   ///
   /// In en, this message translates to:
-  /// **'Ask Claude instead'**
-  String get assistantSwitchToClaude;
+  /// **'Ask {assistant} instead'**
+  String assistantSwitchToAssistant(String assistant);
 
   /// No description provided for @assistantHintWeb.
   ///
@@ -10317,6 +10311,18 @@ abstract class AppLocalizations {
   /// **'Search engine'**
   String get settingsSearchEngine;
 
+  /// No description provided for @settingsAiAssistant.
+  ///
+  /// In en, this message translates to:
+  /// **'AI assistant'**
+  String get settingsAiAssistant;
+
+  /// No description provided for @aiAssistantCustomHint.
+  ///
+  /// In en, this message translates to:
+  /// **'https://example.org/chat?q=%s'**
+  String get aiAssistantCustomHint;
+
   /// No description provided for @searchEngineDevice.
   ///
   /// In en, this message translates to: