Do not delay a browser restart without a screen; clearer reload error

Without a connected monitor every Chromium start waited 30 s for one, so
DevTools was unreachable for ~35 s after a restart. Only wait right after
boot. The reload error now says Chromium may still be starting.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/voxip_kiosk/browser.py

@@ -19,7 +19,7 @@ from pathlib import Path
 from typing import Any
 from urllib.parse import urlencode
 
-from . import logutil
+from . import logutil, sysinfo
 from .config import load_config
 from .paths import Paths, load_paths
 from .validation import parse_resolution
@@ -153,15 +153,21 @@ def wait_for_x(timeout: float = 60) -> bool:
     return False
 
 
+BOOT_GRACE_SECONDS = 180
+
+
 def prepare_display(paths: Paths, config: dict[str, Any]) -> tuple[int, int] | None:
     outputs: list[dict[str, Any]] = []
-    # A monitor that powers up after the Pi may need a moment to report itself.
-    for _ in range(15):
+    # A monitor that powers up together with the Pi may need a moment to report
+    # itself. Later starts (a browser restart without a screen) should not wait.
+    attempts = 15 if (sysinfo.uptime_seconds() or 0) < BOOT_GRACE_SECONDS else 1
+    for attempt in range(attempts):
+        if attempt:
+            time.sleep(2)
         proc = _run(["xrandr", "--query"])
         outputs = parse_xrandr(proc.stdout) if proc and proc.returncode == 0 else []
         if outputs:
             break
-        time.sleep(2)
     size = None
     if outputs:
         output = outputs[0]

src/voxip_kiosk/web/views.py

@@ -357,7 +357,12 @@ def kiosk_reload():
         audit("page_reload")
         return _action_response(True, "De pagina wordt herladen.", request.referrer or url_for("ui.dashboard"))
     except CDPError as exc:
-        return _action_response(False, f"Herladen mislukt: {exc}", request.referrer or url_for("ui.dashboard"))
+        current_app.logger.warning("Herladen mislukt: %s", exc)
+        return _action_response(
+            False,
+            "Herladen mislukt: Chromium reageert niet. Als hij net (her)start, probeer het over een halve minuut opnieuw.",
+            request.referrer or url_for("ui.dashboard"),
+        )
 
 
 def _helper_action(event: str, verb: str, *args: str, back: str):