feat(assistant): search the web too, and choose what goes along

The assistant's field now has a switch at its start: a question goes to
Claude or into a web search, and the field remembers which. A web search
opens the chosen engine's results: on Android the device's own web
search by default (ACTION_WEB_SEARCH, answered by its default browser or
search app; Brave Search where nothing answers), elsewhere Brave Search
by default; Settings › Assistant › Search engine offers Ecosia,
DuckDuckGo, Startpage, Qwant, Google, Bing, or one's own address with
%s where the question goes.

Above the field, chips offer what the question is about: a card's
front, back, each hint and its explanation, the studyset's name and
description. None is chosen, so only what the person picks goes along,
each part cut at 600 characters; Claude gets the question and a compact
line per chosen part, a web search the question and the chosen text,
never the studyset's name. A chosen chip alone is enough to send. The
old sentences around every question (where it was asked, the connector)
are gone: they cost tokens for nothing unless the studyset is chosen.

On a studyset's screen the button now stands above the bottom bar, as in
the Library: unfolded inside the bar, its chips lay outside the bar's
bounds, where taps don't land.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MMm7usAo6q9ZZRoPkWjoxi
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

halkyon_learn_flutter/lib/l10n/app_localizations_en.dart

@@ -5632,11 +5632,11 @@ class AppLocalizationsEn extends AppLocalizations {
   String get settingsAssistant => 'Assistant';
 
   @override
-  String get settingsAskClaude => 'Ask Claude';
+  String get settingsAskClaude => 'Ask Claude or search the web';
 
   @override
   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 Claude with what it is about, and you send it there; nothing is sent from here.';
+      '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.';
 
   @override
   String get assistantHint => 'Ask Claude…';
@@ -5653,7 +5653,7 @@ class AppLocalizationsEn extends AppLocalizations {
   String get assistantSend => 'Ask in Claude';
 
   @override
-  String get assistantOpen => 'Ask Claude';
+  String get assistantOpen => 'Ask or search';
 
   @override
   String get assistantClose => 'Close';
@@ -5661,31 +5661,6 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get assistantOpenFailed => 'Claude couldn\'t be opened.';
 
-  @override
-  String assistantPromptLearning(String question, String instance) {
-    return '$question\n\n(Asked from Halkyon Learn, where I learn with studysets on $instance. If you have the Halkyon Learn connector, you can read them there.)';
-  }
-
-  @override
-  String assistantPromptStudyset(
-    String question,
-    String title,
-    String instance,
-  ) {
-    return '$question\n\n(About my studyset “$title” in Halkyon Learn on $instance. If you have the Halkyon Learn connector, you can read it there.)';
-  }
-
-  @override
-  String assistantPromptCard(
-    String question,
-    String title,
-    String front,
-    String back,
-    String instance,
-  ) {
-    return '$question\n\n(About a flashcard I am studying, in my studyset “$title” in Halkyon Learn on $instance.\nFront: $front\nBack: $back)';
-  }
-
   @override
   String get assistantConnectTitle => 'Connect Claude';
 
@@ -5760,6 +5735,84 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @override
   String get assistantRetry => 'Try again';
+
+  @override
+  String assistantLineFront(String text) {
+    return 'Front: $text';
+  }
+
+  @override
+  String assistantLineBack(String text) {
+    return 'Back: $text';
+  }
+
+  @override
+  String assistantLineHint(int number, String text) {
+    return 'Hint $number: $text';
+  }
+
+  @override
+  String assistantLineExplanation(String text) {
+    return 'Explanation: $text';
+  }
+
+  @override
+  String assistantLineStudyset(String title, String instance) {
+    return 'Studyset: “$title” in Halkyon Learn on $instance';
+  }
+
+  @override
+  String assistantLineDescription(String text) {
+    return 'Description: $text';
+  }
+
+  @override
+  String assistantChipStudyset(String title) {
+    return 'Studyset: $title';
+  }
+
+  @override
+  String get assistantContextLabel => 'Send along';
+
+  @override
+  String get assistantTargetClaude => 'Claude';
+
+  @override
+  String get assistantTargetWeb => 'Web';
+
+  @override
+  String get assistantSwitchToWeb => 'Search the web instead';
+
+  @override
+  String get assistantSwitchToClaude => 'Ask Claude instead';
+
+  @override
+  String get assistantHintWeb => 'Search the web…';
+
+  @override
+  String get assistantSendWeb => 'Search';
+
+  @override
+  String get assistantSearchFailed => 'The search couldn\'t be opened.';
+
+  @override
+  String get settingsSearchEngine => 'Search engine';
+
+  @override
+  String get searchEngineDevice => 'The device\'s search';
+
+  @override
+  String get searchEngineCustom => 'Your own address';
+
+  @override
+  String get searchEngineCustomHint => 'https://example.org/search?q=%s';
+
+  @override
+  String get searchEngineCustomInvalid =>
+      'An http or https address with %s where the question goes.';
+
+  @override
+  String get searchEngineCustomSave => 'Use';
 }
 
 /// The translations for English, as used in the United Kingdom (`en_GB`).