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/workspace/mod.rs

@@ -1501,7 +1501,7 @@ fn add_open_setting_pages_as_editable_binding(app: &mut AppContext) {
         EditableBinding::new(
             "workspace:show_settings_account_page",
             "Open Settings: Account",
-            WorkspaceAction::ShowSettingsPage(SettingsSection::Account),
+            WorkspaceAction::ShowSettingsPage(SettingsSection::About),
         )
         .with_context_predicate(id!("Workspace"))
         .with_group(bindings::BindingGroup::Settings.as_str())
@@ -1526,7 +1526,7 @@ fn add_open_setting_pages_as_editable_binding(app: &mut AppContext) {
             "workspace:show_settings_shared_blocks_page",
             BindingDescription::new("Open Settings: Shared Blocks")
                 .with_custom_description(bindings::MAC_MENUS_CONTEXT, "View Shared Blocks..."),
-            WorkspaceAction::ShowSettingsPage(SettingsSection::SharedBlocks),
+            WorkspaceAction::ShowSettingsPage(SettingsSection::About),
         )
         .with_group(bindings::BindingGroup::Settings.as_str())
         .with_context_predicate(id!("Workspace"))
@@ -1583,13 +1583,6 @@ fn add_open_setting_pages_as_editable_binding(app: &mut AppContext) {
         .with_enabled(|| FeatureFlag::AgentMode.is_enabled())
         .with_group(bindings::BindingGroup::Settings.as_str())
         .with_context_predicate(id!("Workspace")),
-        EditableBinding::new(
-            "workspace:show_settings_billing_and_usage_page",
-            BindingDescription::new("Open Settings: Billing and usage"),
-            WorkspaceAction::ShowSettingsPage(SettingsSection::BillingAndUsage),
-        )
-        .with_group(bindings::BindingGroup::Settings.as_str())
-        .with_context_predicate(id!("Workspace")),
         EditableBinding::new(
             "workspace:show_settings_code_page",
             BindingDescription::new("Open Settings: Code"),
@@ -1600,14 +1593,14 @@ fn add_open_setting_pages_as_editable_binding(app: &mut AppContext) {
         EditableBinding::new(
             "workspace:show_settings_referrals_page",
             BindingDescription::new("Open Settings: Referrals"),
-            WorkspaceAction::ShowSettingsPage(SettingsSection::Referrals),
+            WorkspaceAction::ShowSettingsPage(SettingsSection::About),
         )
         .with_group(bindings::BindingGroup::Settings.as_str())
         .with_context_predicate(id!("Workspace")),
         EditableBinding::new(
             "workspace:show_settings_environments_page",
             BindingDescription::new("Open Settings: Environments"),
-            WorkspaceAction::ShowSettingsPage(SettingsSection::CloudEnvironments),
+            WorkspaceAction::ShowSettingsPage(SettingsSection::About),
         )
         .with_group(bindings::BindingGroup::Settings.as_str())
         .with_context_predicate(id!("Workspace")),