feat: add floating help chat widget, remove settings page (#51)

compliance-dashboard/src/infrastructure/help_chat.rs

@@ -0,0 +1,59 @@
+use dioxus::prelude::*;
+use serde::{Deserialize, Serialize};
+
+// ── Response types ──
+
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+pub struct HelpChatApiResponse {
+    pub data: HelpChatResponseData,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+pub struct HelpChatResponseData {
+    pub message: String,
+}
+
+// ── History message type ──
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct HelpChatHistoryMessage {
+    pub role: String,
+    pub content: String,
+}
+
+// ── Server function ──
+
+#[server]
+pub async fn send_help_chat_message(
+    message: String,
+    history: Vec<HelpChatHistoryMessage>,
+) -> Result<HelpChatApiResponse, ServerFnError> {
+    let state: super::server_state::ServerState =
+        dioxus_fullstack::FullstackContext::extract().await?;
+
+    let url = format!("{}/api/v1/help/chat", state.agent_api_url);
+    let client = reqwest::Client::builder()
+        .timeout(std::time::Duration::from_secs(120))
+        .build()
+        .map_err(|e| ServerFnError::new(e.to_string()))?;
+
+    let resp = client
+        .post(&url)
+        .json(&serde_json::json!({
+            "message": message,
+            "history": history,
+        }))
+        .send()
+        .await
+        .map_err(|e| ServerFnError::new(format!("Help chat request failed: {e}")))?;
+
+    let text = resp
+        .text()
+        .await
+        .map_err(|e| ServerFnError::new(format!("Failed to read response: {e}")))?;
+
+    let body: HelpChatApiResponse = serde_json::from_str(&text)
+        .map_err(|e| ServerFnError::new(format!("Failed to parse response: {e}")))?;
+
+    Ok(body)
+}