Fix cursor focus and selection in input box, add AWS env var warning box, and remove AWS Bedrock login banner

app/src/ui_components/agent_icon_tests.rs

@@ -113,6 +113,7 @@ impl CanonicalRunState {
     /// The canonical [`AgentIconFields`] for this state. `None` means no agent icon renders.
     /// Editing an arm here is the deliberate way to evolve the cross-surface contract.
     fn expected(&self) -> Option<AgentIconFields> {
+        use CanonicalRunState::*;
         match self {
             PlainTerminal => None,
             LocalOzInProgress => Some(AgentIconFields {
@@ -170,6 +171,7 @@ impl CanonicalRunState {
 
     /// Terminal-view inputs for this state. Every state has a terminal representation.
     fn terminal_inputs(&self) -> TerminalIconInputs {
+        use CanonicalRunState::*;
         match self {
             PlainTerminal => TerminalIconInputs {
                 is_ambient: false,
@@ -259,6 +261,7 @@ impl CanonicalRunState {
     /// Run-card inputs for this state, if it can surface as a run card.
     /// Cards only exist for cloud/ambient runs; local states return `None`.
     fn run_inputs(&self) -> Option<(Harness, ConversationStatus, bool)> {
+        use CanonicalRunState::*;
         match self {
             CloudOzInProgress => Some((Harness::Oz, ConversationStatus::InProgress, true)),
             CloudClaudePreDispatch | CloudClaudeInProgress => {