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/terminal/buy_credits_banner.rs

@@ -7,7 +7,7 @@ use galaxy_graphql::billing::AddonCreditsOption;
 use galaxy_graphql::error::BudgetExceededError;
 use galaxyui::elements::{
     Align, Border, ChildAnchor, ChildView, ConstrainedBox, Container, CornerRadius,
-    CrossAxisAlignment, DropShadow, Expanded, Flex, FormattedTextElement, HighlightedHyperlink,
+    CrossAxisAlignment, DropShadow, Empty, Expanded, Flex, FormattedTextElement, HighlightedHyperlink,
     Hoverable, Icon as WarpUiIcon, MainAxisAlignment, MainAxisSize, MouseStateHandle,
     OffsetPositioning, ParentAnchor, ParentElement as _, ParentOffsetBounds, Radius, Shrinkable,
     SizeConstraintCondition, SizeConstraintSwitch, Stack, Text,
@@ -31,7 +31,6 @@ use crate::pricing::{PricingInfoModel, PricingInfoModelEvent};
 use crate::send_telemetry_from_ctx;
 use crate::server::ids::ServerId;
 use crate::server::telemetry::{OutOfCreditsBannerAction, TelemetryEvent};
-use crate::settings_view::create_discount_badge;
 use crate::view_components::{Dropdown, DropdownAction};
 use crate::workspaces::user_workspaces::{UserWorkspaces, UserWorkspacesEvent};
 
@@ -356,7 +355,7 @@ impl BuyCreditsBanner {
                             .with_color(text_color.into())
                             .finish();
 
-                            let discount_badge = create_discount_badge(discount_percent, appearance);
+                            let discount_badge = Empty::new().finish();
 
                             Flex::row()
                                 .with_cross_axis_alignment(CrossAxisAlignment::Center)