fix(ebike): unlock walking during breakdown + hide interact prompt + 450m ride

Three fixes for the ebike-breakdown substep:

1. PlayerController: the previous `if (!isEbikeBreakdown)` guard
   zeroed _wishDir for everyone during breakdown, including the
   player after they had been auto-dismounted to walk mode. Narrow
   the guard to `isEbikeMounted && isEbikeBreakdown` so the bike
   stops accepting drive input but the player on foot can move.

2. Ebike: track `window.ebikeBreakdownActive` in component state
   and hide the InteractableObject (and therefore the interact
   prompt UI) while the breakdown sequence is active. The bike must
   read as inert and non-interactive while the panne dialogue plays
   and during the auto-dismount that follows.

3. ebikeConfig: bump EBIKE_INTRO_BREAKDOWN_DISTANCE from 15 m to
   450 m so the panne triggers after a real ride instead of a few
   meters from the parked spawn.

src/components/ebike/Ebike.tsx

@@ -344,13 +344,19 @@ export function Ebike({
   // pollute the view. The prompt comes back the moment the bike comes to
   // a stop. window.ebikeDriveInputActive is published every frame by
   // PlayerController based on whether a movement key is currently held.
+  // Also hide entirely while the breakdown sequence is active — the bike
+  // must read as inert and non-interactive while the panne dialogue plays
+  // and during the auto-dismount that follows.
   const [isEbikeDriving, setIsEbikeDriving] = useState(false);
+  const [isEbikeBreakdown, setIsEbikeBreakdown] = useState(false);
   useFrame(() => {
     const driving =
       movementMode === "ebike" && window.ebikeDriveInputActive === true;
     if (driving !== isEbikeDriving) setIsEbikeDriving(driving);
+    const breakdown = window.ebikeBreakdownActive === true;
+    if (breakdown !== isEbikeBreakdown) setIsEbikeBreakdown(breakdown);
   });
-  const showInteractPrompt = !isEbikeDriving;
+  const showInteractPrompt = !isEbikeDriving && !isEbikeBreakdown;
 
   const handleInteract = useCallback((): void => {
     if (window.ebikeBreakdownActive === true) return;

src/data/ebike/ebikeConfig.ts

@@ -19,7 +19,7 @@ export const EBIKE_WORLD_POSITION: Vector3Tuple = [68, 0.8, 65];
 export const EBIKE_WORLD_ROTATION_Y = -2.5;
 export const EBIKE_WORLD_SCALE = 0.35;
 
-export const EBIKE_INTRO_BREAKDOWN_DISTANCE = 15;
+export const EBIKE_INTRO_BREAKDOWN_DISTANCE = 450;
 export const EBIKE_BREAKDOWN_DIALOGUE_DELAY_MS = 250;
 
 export const EBIKE_ACCELERATION_DURATION_MS = 2000;

src/world/player/PlayerController.tsx

@@ -363,7 +363,11 @@ export function PlayerController({
     }
 
     _wishDir.set(0, 0, 0);
-    if (!isEbikeBreakdown) {
+    // Block drive input only when still on the bike during breakdown.
+    // Once auto-dismounted (movementMode === "walk"), the player must
+    // remain free to walk around even though ebikeBreakdownActive is true.
+    const blockDriveInput = isEbikeMounted && isEbikeBreakdown;
+    if (!blockDriveInput) {
       if (keys.current.forward) _wishDir.add(_forward);
       if (keys.current.backward) _wishDir.sub(_forward);
       if (!isEbikeMounted) {