Trail modes + the tip grows glued to the icon

«Показывать путь робота» is a three-way choice now: never / while
cleaning (the default — the line hides the moment the run ends) /
always (the only mode that also shows the faded previous run).
trail_mode rides next to the legacy bool, which still maps in.

The last segment no longer pops in when the next telemetry point
arrives: a rAF sampler drags a tip line's endpoint to the puck's
animated centre every frame, so the path visually pours out strictly
from under the icon. The sampler runs only while pucks exist and stops
itself.

demo/smoke_vacuum.mjs

@@ -87,7 +87,8 @@ const out = await page.evaluate(async () => {
     'vacuum.robo': { state: 'docked', attributes: { friendly_name: 'Робот' } } } };
   c._regSignature = ''; c.requestUpdate(); await c.updateComplete; await new Promise((r) => setTimeout(r, 30));
   o.puckGoneWhenDocked = !sr().querySelector('.vacpuck');
-  o.trailLingers = !!sr().querySelector('.vactrail polyline');
+  // default mode 'cleaning': the trail HIDES the moment the run ends (owner)
+  o.trailHiddenAfterDock = !sr().querySelector('.vactrail polyline');
 
   // hidden marker renders neither puck nor trail
   c.hass = { ...c.hass, states: { ...c.hass.states,
@@ -104,6 +105,7 @@ const out = await page.evaluate(async () => {
   o.unknownMapNoPuck = !sr().querySelector('.vacpuck');
 
   // ---- server-side runs: current + one previous (owner 2026-07-31) ----
+  cfg.markers.find((m) => m.id === 'e_vacuum_robo').vacuum.trail_mode = 'always';
   c._vacSrvTrails = { e_vacuum_robo: {
     current: { map_id: 'm1', started: 1, ended: null,
       points: [[700, 500], [900, 500], [1100, 640], [950, 1150]] },
@@ -123,6 +125,21 @@ const out = await page.evaluate(async () => {
   // 4 server points, the live tail trimmed while moving -> 3 rendered
   o.srvCurTrimmed = !!cur && cur.getAttribute('points').split(' ').length === 3;
   o.srvPrevFaded = !!prevG && getComputedStyle(prevG).opacity === '0.4';
+  // the growing tip is glued to the puck by the rAF sampler
+  const tip = sr().querySelector('line.tip');
+  o.tipExists = !!tip;
+  await new Promise((r) => setTimeout(r, 250));
+  const puckNow = sr().querySelector('.vacpuck').getBoundingClientRect();
+  const svgT = sr().querySelector('.vactrail');
+  const vbT = svgT.viewBox.baseVal; const sbT = svgT.getBoundingClientRect();
+  const tx = sbT.left + ((parseFloat(tip.getAttribute('x2')) - vbT.x) / vbT.width) * sbT.width;
+  const ty = sbT.top + ((parseFloat(tip.getAttribute('y2')) - vbT.y) / vbT.height) * sbT.height;
+  o.tipGluedToPuck = Math.hypot(tx - (puckNow.left + puckNow.width / 2), ty - (puckNow.top + puckNow.height / 2)) < 12;
+  // 'never' kills every line including the previous run
+  cfg.markers.find((m) => m.id === 'e_vacuum_robo').vacuum.trail_mode = 'never';
+  c._regSignature = ''; c.requestUpdate(); await c.updateComplete;
+  o.neverHidesAll = !sr().querySelector('.vactrail');
+  cfg.markers.find((m) => m.id === 'e_vacuum_robo').vacuum.trail_mode = null;
   c._vacSrvTrails = {};
 
   // ---- the fit panel (drag + corner-stretch) end to end ----
@@ -202,9 +219,10 @@ checkAll(out, {
   noWedge: true, iconCentred: true, baseStaysDuringCleaning: true, trailDrawn: true,
   trailScaledByMatrix: true, trailBehindPuck: true, zoomTeleports: true,
   trailCasing: true, trailToggleOff: true,
-  puckGoneWhenDocked: true, trailLingers: true, hiddenNoPuck: true,
+  puckGoneWhenDocked: true, trailHiddenAfterDock: true, hiddenNoPuck: true,
   unknownMapNoPuck: true,
   srvPrevRunShown: true, srvCurTrimmed: true, srvPrevFaded: true,
+  tipExists: true, tipGluedToPuck: true, neverHidesAll: true,
   fitDevFound: true, fitOverlay: true, fitGhostRooms: true, fitLabels: true,
   fitHandles: true, fitHandleHittable: true, fitGhostHittable: true, fitBar: true, fitMirrorDefault: true, fitDragMoves: true,
   fitRotateKeepsCentre: true, fitCornerScales: true, fitSavedMatrix: true,