Fix: single-point track hung showSessionDetail (Delete did nothing)

Diagnosed live over the WebView DevTools protocol: a 0 km track had exactly one
usable point. The map block runs (points.length is truthy), but with a single
coordinate fitBounds is skipped, so the Leaflet map never gets a view and never
fires 'load'. With a saved route active, the overlay code then does
`await whenMapReady(map)`, which waits on that 'load' event forever — hanging the
rest of showSessionDetail, so the Delete/Recalc/Export handlers past it never
bind. No exception, just a silent stall (hence "nothing happens on Delete").

Fix: when there are < 2 coords, setView to the single point so the map loads and
whenMapReady resolves. Verified end-to-end via DevTools: the button now binds and
the 0 km track deletes.

(The prior commit moved the handlers out of the `points.length` guard, which
covers a truly 0-point track; this covers the 1-point-with-route hang.)

frontend/js/main.js

@@ -4563,6 +4563,12 @@ async function showSessionDetail(sessionId) {
     map.invalidateSize();
     if (allCoords.length > 1) {
       map.fitBounds(L.latLngBounds(allCoords).pad(0.1));
+    } else if (points.length) {
+      // Degenerate track (a single usable point): fitBounds needs 2+ coords, so
+      // give the map a view explicitly — otherwise it never fires 'load' and the
+      // route-overlay `await whenMapReady(map)` below hangs forever, blocking the
+      // rest of showSessionDetail (including the Delete button binding).
+      map.setView([points[0].lat, points[0].lon], 15);
     }
     mapEl._bounds = allCoords.length > 1 ? L.latLngBounds(allCoords).pad(0.1) : null;
 

src-tauri/Cargo.lock

@@ -139,7 +139,7 @@ checksum = "c08606f8c3cbf4ce6ec8e28fb0014a2c086708fe954eaa885384a6165172e7e8"
 
 [[package]]
 name = "baldav"
-version = "0.1.408"
+version = "0.1.409"
 dependencies = [
  "base64 0.22.1",
  "btleplug",

src-tauri/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "baldav"
-version = "0.1.408"
+version = "0.1.409"
 edition = "2021"
 
 [lib]

src-tauri/tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://raw.githubusercontent.com/nicegui/tauri-v2/refs/heads/main/tooling/cli/schema.json",
   "productName": "BalDav",
-  "version": "0.1.408",
+  "version": "0.1.409",
   "identifier": "dev.baldav.app",
   "build": {
     "frontendDist": "../frontend"