feat: enhance workspace management and history tracking in application state

src/app/state/rest.rs

@@ -104,7 +104,7 @@ impl AppStateRest {
                 tracing::warn!("[state] session_dir has no file_name component, using empty session_id");
                 String::new()
             });
-        let state = AppStateRest {
+        let mut state = AppStateRest {
 
             settings,
             app_config,
@@ -133,6 +133,34 @@ impl AppStateRest {
             quit: false,
         };
 
+        // Load project-specific history
+        let base_dir = state.memory_dir.parent().unwrap_or(&state.memory_dir);
+        if let Some(root) = state.workspace_roots.first() {
+            if let Ok(abs_root) = std::fs::canonicalize(root) {
+                use sha2::Digest;
+                let mut hasher = sha2::Sha256::new();
+                hasher.update(abs_root.to_string_lossy().as_bytes());
+                let hash_hex = format!("{:x}", hasher.finalize());
+                let folder_name = abs_root.file_name()
+                    .map(|n| n.to_string_lossy().to_string())
+                    .unwrap_or_else(|| "root".to_string());
+                let history_filename = format!("{}-{}.txt", folder_name, &hash_hex[..8]);
+                let history_dir = base_dir.join("history");
+                let _ = std::fs::create_dir_all(&history_dir);
+                let history_file = history_dir.join(history_filename);
+
+                if let Ok(content) = std::fs::read_to_string(&history_file) {
+                    let history: Vec<String> = content
+                        .lines()
+                        .map(|s| s.to_string())
+                        .filter(|s| !s.is_empty())
+                        .collect();
+                    state.input.history = history;
+                }
+                state.input.history_file = Some(history_file);
+            }
+        }
+
         // Fire-and-forget background LSP provisioning.
         //
         // Flow: spawn OS thread -> provision_all() probes/installs every