feat: inject global rules into AI system prompt and fix Rules UI seeding

- Load global rules (AIFact/AIMemory) from local CloudModel and inject
  them into the Bedrock/OpenAI system prompt as a '## Global Rules' section
  when memory is enabled.
- Fix rule seeding: always re-seed predefined rules when the CloudModel has
  none, regardless of the has_seeded_predefined_rules flag (handles case
  where flag was set but rules never persisted due to prior missing owner).
- Rename /context slash command to /copy-context: dumps the full context
  window (global rules, progressive summary, message history) to the
  clipboard for debugging.

app/src/ai/facts/view/rule.rs

@@ -319,8 +319,10 @@ impl RuleView {
                 .on_click(|ctx| ctx.dispatch_typed_action(RuleViewAction::InitializeProject))
         });
 
-        // Seed predefined rules on first launch if no global rules exist
-        if ai_rules.is_empty() && !AISettings::as_ref(ctx).has_seeded_predefined_rules() {
+        // Seed predefined rules on first launch if no global rules exist.
+        // Also re-seed if the flag was set but rules are empty (e.g., prior bug
+        // where the flag was set but creation failed due to missing owner).
+        if ai_rules.is_empty() {
             if let Some(owner) = owner {
                 let update_manager = UpdateManager::handle(ctx);
                 update_manager.update(ctx, |update_manager, ctx| {