Add AWS Bedrock auth mode with per-project configuration

Introduces a third auth mode alongside Login and API Key, allowing
projects to authenticate Claude Code via AWS Bedrock. Includes support
for static credentials, profile-based, and bearer-token auth methods
with full UI controls. Also adds a URL accumulator to the terminal to
reassemble long OAuth URLs split across hard newlines, and installs
the AWS CLI v2 in the container image.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/src-tauri/src/commands/project_commands.rs

@@ -69,6 +69,15 @@ pub async fn start_project_container(
             // Auth state persists in the .claude config volume.
             None
         }
+        AuthMode::Bedrock => {
+            // Bedrock mode: no Anthropic API key needed, uses AWS credentials.
+            let bedrock = project.bedrock_config.as_ref()
+                .ok_or_else(|| "Bedrock auth mode selected but no Bedrock configuration found.".to_string())?;
+            if bedrock.aws_region.is_empty() {
+                return Err("AWS region is required for Bedrock auth mode.".to_string());
+            }
+            None
+        }
     };
 
     // Update status to starting