fix: improve error handling and stability - no logout on transient errors, add ErrorBoundary, global error logging

app/main.py

@@ -8,7 +8,7 @@ from contextlib import asynccontextmanager
 
 from fastapi import FastAPI, HTTPException, Request
 from fastapi.middleware.cors import CORSMiddleware
-from fastapi.responses import FileResponse
+from fastapi.responses import FileResponse, JSONResponse
 from fastapi.staticfiles import StaticFiles
 from starlette.middleware.base import BaseHTTPMiddleware
 import importlib
@@ -29,6 +29,7 @@ from app.routes import (
     ai_copilot,
     audit,
     auth,
+    errors,
     contact_folders,
     contacts,
     dashboard,
@@ -308,6 +309,22 @@ def create_app() -> FastAPI:
     app.add_middleware(CSRFMiddleware)
     app.add_middleware(RequestLoggingMiddleware)
 
+    # ── Global exception handler — catch ALL unhandled exceptions ──
+    @app.exception_handler(Exception)
+    async def global_exception_handler(request: Request, exc: Exception):
+        logger.error(f"Unhandled exception: {exc}", exc_info=True)
+        record_error(
+            event="unhandled_exception",
+            method=request.method,
+            path=request.url.path,
+            status_code=500,
+            error=str(exc),
+        )
+        return JSONResponse(
+            status_code=500,
+            content={"detail": "Internal server error", "code": "internal_error"},
+        )
+
     app.include_router(health.router)
     app.include_router(metrics.router)
     app.include_router(auth.router)
@@ -338,6 +355,7 @@ def create_app() -> FastAPI:
     app.include_router(custom_fields.router)
     app.include_router(saved_filters.router)
     app.include_router(webhooks.router)
+    app.include_router(errors.router)
 
     # ── Register plugin routes for all built-in plugins ──
     # Routes are registered here (before app start); activation status
@@ -375,8 +393,8 @@ def create_app() -> FastAPI:
                             router_module = importlib.import_module(route_def.module)
                             router = getattr(router_module, route_def.router_attr)
                             app.include_router(router)
-                        except Exception:
-                            pass
+                        except Exception as exc:
+                            logger.error(f"Failed to register route {route_def.module}.{route_def.router_attr}: {exc}")
                     break
         except Exception as exc:
             logger.error(f"Failed to register plugin routes for {mod_name}: {exc}")