Remove Warp cloud features and OpenTelemetry

Settings cleanup:
- Remove billing_and_usage, main_page, referrals_page, show_blocks_view,
  environments_page, handoff_environment_creation_modal,
  custom_inference_modal, remove_custom_endpoint_confirmation_dialog,
  transfer_ownership_confirmation_modal, delete_environment_confirmation_dialog
- Remove SettingsSection variants: Account, BillingAndUsage, Referrals,
  SharedBlocks, CloudEnvironments, OzCloudAPIKeys
- Remove SettingsPageViewHandle variants: Main, BillingAndUsage, Referrals,
  CloudEnvironments, OzCloudAPIKeys, SharedBlocks
- Add Platform variant for PlatformPageView
- Gut custom inference endpoint UI from ai_page.rs
- Gut transfer ownership modal from teams_page.rs
- Stub environment_management_pane as dead code
- Remove create_discount_badge usage
- Remove handle_experiment_change call

OpenTelemetry removal:
- Remove opentelemetry, opentelemetry-http, opentelemetry-otlp,
  opentelemetry_sdk, tracing-opentelemetry dependencies
- Replace tracing module with no-op stub
- Delete native.rs and cloud_agent_auth.rs

Bug fixes (prior work):
- Fix apply_diffs() to use markdown_unescaped(ctx)
- Fix notebook executor AIDocumentId handling
- Fix margin/corner-radius consistency in requested_command.rs
- Add document tool handlers to extract_tool_result_content()
- Fix deprecated from_byte_stream in MCP SSE transport
- Fix Cargo.toml profile package spec
- Upgrade rust-toolchain to 1.94.1

app/src/settings_view/settings_page.rs

@@ -29,17 +29,12 @@ use settings::Setting;
 use super::about_page::AboutPageView;
 use super::ai_page::{AISettingsPageAction, AISettingsPageView};
 use super::appearance_page::AppearanceSettingsPageView;
-use super::billing_and_usage_dispatch::BillingAndUsageDispatchView;
 use super::code_page::CodeSettingsPageView;
-use super::environments_page::EnvironmentsPageView;
 use super::features_page::FeaturesPageView;
 use super::keybindings::KeybindingsView;
-use super::main_page::MainSettingsPageView;
 use super::mcp_servers_page::MCPServersSettingsPageView;
 use super::privacy_page::PrivacyPageView;
-use super::referrals_page::ReferralsPageView;
 use super::scripting_page::ScriptingSettingsPageView;
-use super::show_blocks_view::ShowBlocksView;
 use super::teams_page::TeamsPageView;
 use super::warp_drive_page::WarpDriveSettingsPageView;
 use super::warpify_page::WarpifyPageView;
@@ -100,7 +95,6 @@ pub trait SettingsPageMeta {
 /// It is required to allow for SettingsPage struct be put in the collection (ie. vector).
 #[derive(Clone)]
 pub enum SettingsPageViewHandle {
-    Main(ViewHandle<MainSettingsPageView>),
     Appearance(ViewHandle<AppearanceSettingsPageView>),
     Features(ViewHandle<FeaturesPageView>),
     Keybindings(ViewHandle<KeybindingsView>),
@@ -108,23 +102,18 @@ pub enum SettingsPageViewHandle {
     Code(ViewHandle<CodeSettingsPageView>),
     Privacy(ViewHandle<PrivacyPageView>),
     Warpify(ViewHandle<WarpifyPageView>),
-    Referrals(ViewHandle<ReferralsPageView>),
     Scripting(ViewHandle<ScriptingSettingsPageView>),
     AI(ViewHandle<AISettingsPageView>),
-    CloudEnvironments(ViewHandle<EnvironmentsPageView>),
-    BillingAndUsage(ViewHandle<BillingAndUsageDispatchView>),
     MCPServers(ViewHandle<MCPServersSettingsPageView>),
     WarpDrive(ViewHandle<WarpDriveSettingsPageView>),
-    OzCloudAPIKeys(ViewHandle<super::platform_page::PlatformPageView>),
-    Teams(ViewHandle<super::teams_page::TeamsPageView>),
-    SharedBlocks(ViewHandle<ShowBlocksView>),
+    Teams(ViewHandle<TeamsPageView>),
+    Platform(ViewHandle<super::platform_page::PlatformPageView>),
 }
 
 impl SettingsPageViewHandle {
     pub fn child_view(&self) -> Box<dyn Element> {
         use SettingsPageViewHandle::*;
         match self {
-            Main(view_handle) => ChildView::new(view_handle).finish(),
             Appearance(view_handle) => ChildView::new(view_handle).finish(),
             Features(view_handle) => ChildView::new(view_handle).finish(),
             Keybindings(view_handle) => ChildView::new(view_handle).finish(),
@@ -132,16 +121,12 @@ impl SettingsPageViewHandle {
             Code(view_handle) => ChildView::new(view_handle).finish(),
             Privacy(view_handle) => ChildView::new(view_handle).finish(),
             Warpify(view_handle) => ChildView::new(view_handle).finish(),
-            Referrals(view_handle) => ChildView::new(view_handle).finish(),
             Scripting(view_handle) => ChildView::new(view_handle).finish(),
             AI(view_handle) => ChildView::new(view_handle).finish(),
-            BillingAndUsage(view_handle) => ChildView::new(view_handle).finish(),
             MCPServers(view_handle) => ChildView::new(view_handle).finish(),
             WarpDrive(view_handle) => ChildView::new(view_handle).finish(),
-            CloudEnvironments(view_handle) => ChildView::new(view_handle).finish(),
-            OzCloudAPIKeys(view_handle) => ChildView::new(view_handle).finish(),
             Teams(view_handle) => ChildView::new(view_handle).finish(),
-            SharedBlocks(view_handle) => ChildView::new(view_handle).finish(),
+            Platform(view_handle) => ChildView::new(view_handle).finish(),
         }
     }
 }