Add location search and polish running route planner

docs/ROUTE_PLANNER.md

@@ -1,7 +1,10 @@
 # Route planner
 
 Open **Routes** in Stride. Select the start on the map, enter latitude/longitude,
-or use your location. Choose a loop or select a separate finish, distance (1–50 km),
+search by typing a place/address and choosing a suggestion, or use your location.
+Both start and finish support search with arrow-key/Enter selection. Suggestions
+are biased towards the current map view, without restricting the search region.
+Choose a loop or select a separate finish, distance (1–50 km),
 hill difficulty, surface preference and ranking priority. Generated candidates show
 their actual distance, ascent, route geometry, elevation profile and quality coverage.
 Save a named route privately, reopen it, download GPX, or delete it.
@@ -48,7 +51,15 @@ Quality percentages follow ORS documented waytype and surface IDs:
 
 Crossing counts, lighting, current access and live traffic are unverified.
 GPX includes the route and available elevation, without fictional timestamps.
-No direct Garmin course upload or place-name search is included in this version.
+No direct Garmin course upload is included in this version.
+
+Place searches use the same server-side ORS key and a fixed geocoding endpoint.
+Typing waits 650 ms before searching; old responses are discarded when the query
+changes. Queries are bounded to 3–200 characters with at most five results and an
+eight-second provider timeout. The authenticated POST endpoint requires CSRF and
+is limited to 30 searches/minute and 600/day. Provider labels are inserted as text.
+Start/finish pins use self-contained CSS markers, so no external marker images
+are required. Selected pins can be dragged to adjust their location.
 
 ## Persistence and validation