Clarify Departures covers bus/tram/subway too, add clear found/not-found feedback

The API (HAFAS via db-vendo-client) covers all public transport in one
system, not just trains -- verified with a mocked bus-stop response
(Bus 14/Bus 9/Bus 66 mixed with a regional train, all rendering correctly,
no code changes needed since nothing in check()/render() ever filtered by
mode). Fixed the "Train departures" wording in code comments and settings
UI, which was misleadingly train-specific.

Also added an explicit "Found: <station>" confirmation toast on a
successful station lookup, distinct from the generic "Saved." toast --
previously the only feedback was a passive "Currently: X" hint, easy to
miss and not obviously tied to the save you just did.

web/app.py

@@ -123,7 +123,7 @@ def create_app(config, screens: dict, scheduler) -> Flask:
                         "results": results,
                         "update_minutes": update_minutes,
                     })
-                    return redirect(url_for("settings_departures", saved=1))
+                    return redirect(url_for("settings_departures", found=found["name"]))
             else:
                 config.update_screen_settings("departures", {"results": results, "update_minutes": update_minutes})
                 return redirect(url_for("settings_departures", saved=1))

web/templates/settings_departures.html

@@ -5,6 +5,9 @@
 {% if error %}
 <div class="toast error">{{ error }}</div>
 {% endif %}
+{% if request.args.get('found') %}
+<div class="toast">Found: {{ request.args.get('found') }}</div>
+{% endif %}
 
 <p class="hint" style="margin: -0.5rem 0 1.25rem;">
   Uses the free, unofficial db-vendo-client API (v6.db.transport.rest) --
@@ -17,8 +20,9 @@
   <div class="card">
     <div class="section-label">Station</div>
     <div class="field">
-      <label for="station">Station name</label>
+      <label for="station">Station or stop name</label>
       <input type="text" id="station" name="station" placeholder="e.g. Berlin Hauptbahnhof">
+      <p class="hint">Works for bus/tram/subway stops too, not just train stations -- search by name the same way either way.</p>
       {% if settings.station_label %}
       <p class="hint">Currently: {{ settings.station_label }}</p>
       {% endif %}