perf/fix v1.43.1: external audit P1 — render cost, drag threshold, geometry, backend

L1: memoized space model + open pairs (structural fingerprint key, epoch
bumped synchronously at mutation time, not inside the debounce); hoisted
per-room geometry out of the render loop; smoke asserts zero recomputation
across state pushes.

L4: openings get the 3 px drag threshold used by every other pipeline and
only write when the geometry actually changed — taps open the dialog again.

G2: interiorPoint() replaces the vertex mean, so island rooms inside
concave (U/L) parents are accepted and their evenodd holes render; traced
duplicates still are not containment.

G3: segKey rounds before ordering — one shared wall, one key.

B2: _check_write fails closed when the entry is unavailable.
B3: layout/set honours expected_rev and returns the new rev.
B4: config/set without expected_rev over a non-empty store logs a warning.
B5: coordinates reject NaN/Infinity; spaces/rooms/markers/decor/layout capped.

+2 unit tests (118), +2 backend tests (14), smoke_render_perf; docs
same-commit

src/houseplan-card.ts

@@ -32,7 +32,7 @@ import './space-card';
 import { cardStyles } from './styles';
 import { langOf, t, type I18nKey } from './i18n';
 
-const CARD_VERSION = '1.43.0';
+const CARD_VERSION = '1.43.1';
 const LS_KEY = 'houseplan_card_layout_v1';
 const LS_CFG = 'houseplan_card_cfg_v1'; // cache of the server config+layout for instant rendering
 const LS_ZOOM = 'houseplan_card_zoom_v1';
@@ -177,7 +177,7 @@ class HouseplanCard extends LitElement {
     x: number; y: number; angle: number; // render units (from the wall snap)
   } | null = null;
   private _openingInfo: OpeningCfg | null = null;
-  private _opDrag: { id: string; moved: boolean } | null = null;
+  private _opDrag: { id: string; moved: boolean; sx: number; sy: number; dirty: boolean } | null = null;
   private _mergeDialog: { aId: string; bId: string; poly: number[][]; pick: 'a' | 'b' } | null = null;
   private _splitSel: { roomId: string; pts: number[][] } | null = null; // room being cut + the cut path so far
   // a split is applied only when the new room's dialog is confirmed — cancel leaves the room intact
@@ -360,7 +360,7 @@ class HouseplanCard extends LitElement {
     clearTimeout(this._kioskDotsTimer);
     clearTimeout(this._kioskHoldTimer);
     clearTimeout(this._reloadRetry);
-    this._saveConfig.flush(); // never leave an edit unsent on teardown
+    this._saveConfigDebounced.flush(); // never leave an edit unsent on teardown
     window.removeEventListener('hashchange', this._onHashChange);
     clearTimeout(this._holdTimer);
     this._roViewport?.disconnect();
@@ -480,6 +480,7 @@ class HouseplanCard extends LitElement {
       const c = JSON.parse(localStorage.getItem(LS_CFG) || 'null');
       if (c && c.config && Array.isArray(c.config.spaces)) {
         this._serverCfg = c.config;
+        this._cfgEpoch++;
         this._cfgRev = c.rev || 0;
         this._layout = c.layout || {};
         this._serverStorage = true;
@@ -520,7 +521,36 @@ class HouseplanCard extends LitElement {
   }
 
   /** Spaces in render units (NORM_W × NORM_W/aspect). */
+  /** Bumped by every config mutation — the model/geometry cache key (audit L1). */
+  private _cfgEpoch = 0;
+  private _modelCache: { key: string; model: SpaceModel[] } | null = null;
+
+  /** Cheap structural fingerprint of the config (audit L1 cache key). */
+  private _cfgFingerprint(): string {
+    const sp = this._serverCfg?.spaces || [];
+    let s = sp.length + ':';
+    for (const x of sp as any[]) {
+      s += (x.id || '') + ',' + (x.aspect || '') + ',' + (x.plan_url || '').length + ','
+        + (x.rooms?.length || 0) + ',' + (x.openings?.length || 0) + ',' + (x.decor?.length || 0) + ';';
+      for (const r of x.rooms || [])
+        s += (r.poly?.length || 0) + '.' + (r.id || '') + '.' + (r.open_to || []).join('+') + '.'
+          + (r.area || '') + '.' + JSON.stringify(r.settings || 0) + ';';
+    }
+    return s;
+  }
+
   private get _model(): SpaceModel[] {
+    if (!this._serverCfg) return [];
+    // same reasoning as _openPairs: mutations in place mean the epoch can lag,
+    // so the key also carries the config's structural fingerprint
+    const key = this._cfgEpoch + '|' + this._cfgFingerprint();
+    if (this._modelCache && this._modelCache.key === key) return this._modelCache.model;
+    const built = this._buildModel();
+    this._modelCache = { key, model: built };
+    return built;
+  }
+
+  private _buildModel(): SpaceModel[] {
     if (!this._serverCfg) return [];
     return this._serverCfg.spaces.map((s: any) => {
       const H = NORM_W / s.aspect;
@@ -645,6 +675,7 @@ class HouseplanCard extends LitElement {
       this._serverStorage = true;
       const cfg = cfgResp?.config;
       this._serverCfg = cfg && Array.isArray(cfg.spaces) ? cfg : null;
+      this._cfgEpoch++;
       this._cfgRev = cfgResp?.rev || 0;
       this._layout = layResp?.layout || {};
       // live sync: the config was changed in another window → re-read it
@@ -698,7 +729,7 @@ class HouseplanCard extends LitElement {
    */
   private async _reloadConfigOnly(force = false): Promise<void> {
     if (!force) {
-      if (this._saveConfig.pending()) this._saveConfig.flush();
+      if (this._saveConfigDebounced.pending()) this._saveConfigDebounced.flush();
       if (this._cfgWriting) {
         // retry once the in-flight write settles
         clearTimeout(this._reloadRetry);
@@ -710,6 +741,7 @@ class HouseplanCard extends LitElement {
       const resp = await this.hass.callWS({ type: 'houseplan/config/get' });
       const cfg = resp?.config;
       this._serverCfg = cfg && Array.isArray(cfg.spaces) ? cfg : null;
+      this._cfgEpoch++;
       this._cfgRev = resp?.rev || 0;
       this._cacheSnapshot();
       this._regSignature = '';
@@ -1437,7 +1469,18 @@ class HouseplanCard extends LitElement {
   /** A config write is in flight — the card must not adopt a server revision. */
   private _cfgWriting = false;
 
-  private _saveConfig = debounce(() => {
+  /**
+   * Every mutation path ends here, so this is the one place that can invalidate
+   * the geometry caches synchronously. The WRITE stays debounced; the epoch bump
+   * must not be (audit L1: a bump inside the debounce arrives 500 ms after the
+   * render that needed it, and the plan renders stale geometry).
+   */
+  private _saveConfig(): void {
+    this._cfgEpoch++;
+    this._saveConfigDebounced();
+  }
+
+  private _saveConfigDebounced = debounce(() => {
     if (!this._serverCfg) return;
     this._dropLegacySegments();
     this._cfgWriting = true;
@@ -1844,7 +1887,25 @@ class HouseplanCard extends LitElement {
   }
 
   /** All open-boundary pairs of the current space with their shared segments. */
+  private _openPairsCache: { key: string; pairs: { a: RoomCfg; b: RoomCfg; segs: number[][] }[] } | null = null;
+
   private _openPairs(): { a: RoomCfg; b: RoomCfg; segs: number[][] }[] {
+    // audit L1: this used to run once PER ROOM on every render (O(rooms^3)
+    // collinear-overlap math on every HA state push). Memoized on the config
+    // epoch + current space.
+    // The key includes the open_to links themselves: _serverCfg is mutated in
+    // place in ~22 places (audit L7), so an epoch counter alone is not a
+    // trustworthy cache key — a missed bump would render a stale plan, which is
+    // far worse than recomputing a short string here.
+    const sp = this._spaceModel();
+    const key = this._space + '|' + sp.rooms.map((r) => r.id + ':' + ((r as any).open_to || []).join(',')).join(';');
+    if (this._openPairsCache && this._openPairsCache.key === key) return this._openPairsCache.pairs;
+    const pairs = this._computeOpenPairs();
+    this._openPairsCache = { key, pairs };
+    return pairs;
+  }
+
+  private _computeOpenPairs(): { a: RoomCfg; b: RoomCfg; segs: number[][] }[] {
     const rooms = this._spaceModel().rooms.filter((r) => r.id);
     const res: { a: RoomCfg; b: RoomCfg; segs: number[][] }[] = [];
     for (let i = 0; i < rooms.length; i++)
@@ -1955,11 +2016,16 @@ class HouseplanCard extends LitElement {
     } catch {
       /* an inactive pointerId (synthetic events, some browsers) must not kill the drag */
     }
-    this._opDrag = { id: o.id, moved: false };
+    this._opDrag = { id: o.id, moved: false, sx: ev.clientX, sy: ev.clientY, dirty: false };
   }
 
   private _opPointerMove(ev: PointerEvent, o: OpeningCfg): void {
     if (!this._opDrag || this._opDrag.id !== o.id) return;
+    // audit L4: the other drag pipelines require 3 px before calling it a drag.
+    // Without it every tap counted as a drag: the properties dialog never
+    // opened and an unchanged config was written (which then broadcast the
+    // event behind the L2 data loss).
+    if (Math.abs(ev.clientX - this._opDrag.sx) + Math.abs(ev.clientY - this._opDrag.sy) <= 3) return;
     const raw = this._svgPoint(ev);
     const snap = snapToWall(raw, this._spaceModel().rooms, this._gridPitch * 4);
     if (!snap) return; // too far from any wall: the opening stays where it was
@@ -1967,8 +2033,11 @@ class HouseplanCard extends LitElement {
     const sp = this._curSpaceCfg;
     const cfg = sp?.openings?.find((x: OpeningCfg) => x.id === o.id);
     if (!cfg) return;
-    cfg.x = snap.x / NORM_W;
-    cfg.y = snap.y / this._spaceH;
+    const nx = snap.x / NORM_W;
+    const ny = snap.y / this._spaceH;
+    if (cfg.x !== nx || cfg.y !== ny || cfg.angle !== snap.angle) this._opDrag.dirty = true;
+    cfg.x = nx;
+    cfg.y = ny;
     cfg.angle = snap.angle;
     this.requestUpdate();
   }
@@ -1976,7 +2045,8 @@ class HouseplanCard extends LitElement {
   private _opPointerUp(ev: PointerEvent, o: OpeningCfg): void {
     if (!this._opDrag || this._opDrag.id !== o.id) return;
     const moved = this._opDrag.moved;
-    if (moved) this._saveConfig();
+    // only write when the geometry actually changed (audit L4)
+    if (moved && this._opDrag.dirty) this._saveConfig();
     // keep the flag until the click event that follows pointerup, then let it go
     if (moved) window.setTimeout(() => (this._opDrag = null), 0);
     else this._opDrag = null;
@@ -2867,6 +2937,7 @@ class HouseplanCard extends LitElement {
   conflict again. */
   private async _saveConfigNow(): Promise<void> {
     this._dropLegacySegments();
+    this._cfgEpoch++;
     try {
       const r = await this.hass.callWS({
         type: 'houseplan/config/set', config: this._serverCfg, expected_rev: this._cfgRev,
@@ -3418,7 +3489,18 @@ class HouseplanCard extends LitElement {
               ? svg`<image href="${space.bg.href}" x="${space.bg.x}" y="${space.bg.y}" width="${space.bg.w}" height="${space.bg.h}" preserveAspectRatio="none" />`
               : nothing}
             ${this._renderDecorLayer()}
-            ${space.rooms.filter((r) => r.area || this._markup || disp.showBorders).map((r) => {
+            ${(() => {
+              // audit L1: hoisted out of the per-room map — these depend on the
+              // config, not on entity state, and were recomputed per room.
+              const allPairs = this._openPairs();
+              const polyCache = new Map<any, number[][] | null>();
+              const polyOf = (rr: any) => {
+                if (!polyCache.has(rr)) polyCache.set(rr, roomPoly(rr));
+                return polyCache.get(rr)!;
+              };
+              const otherPolys = (rr: any) =>
+                space.rooms.filter((o) => o !== rr).map(polyOf).filter(Boolean) as number[][][];
+              return space.rooms.filter((r) => r.area || this._markup || disp.showBorders).map((r) => {
               let cls = 'room ' + (space.bg ? 'overlay' : 'yard') + (this._markup ? ' outlined' : '');
               if (this._markup && (r.id === this._mergeSel || r.id === this._splitSel?.roomId))
                 cls += ' picked';
@@ -3465,16 +3547,12 @@ class HouseplanCard extends LitElement {
               // amber highlight — the merge/split selection must stay visible).
               const isPicked = this._markup && (r.id === this._mergeSel || r.id === this._splitSel?.roomId);
               const openCuts = r.id && !isPicked
-                ? this._openPairs()
-                    .filter((pp) => pp.a.id === r.id || pp.b.id === r.id)
-                    .flatMap((pp) => pp.segs)
+                ? allPairs.filter((pp) => pp.a.id === r.id || pp.b.id === r.id).flatMap((pp) => pp.segs)
                 : [];
               if (openCuts.length) cls += ' noedge';
               // island rooms punch holes in their parent's fill (evenodd)
-              const myPoly = roomPoly(r);
-              const holes = myPoly
-                ? islandsOf(myPoly, space.rooms.filter((o) => o !== r).map((o) => roomPoly(o)!).filter(Boolean))
-                : [];
+              const myPoly = polyOf(r);
+              const holes = myPoly ? islandsOf(myPoly, otherPolys(r)) : [];
               const pathD = (pts: number[][]) =>
                 'M ' + pts.map((p) => p[0] + ' ' + p[1]).join(' L ') + ' Z';
               const shape = holes.length && myPoly
@@ -3499,7 +3577,8 @@ class HouseplanCard extends LitElement {
                     style=${this._markup ? nothing : `stroke:${disp.color};stroke-opacity:${disp.showBorders ? disp.opacity : 0}`}></path>`
                 : nothing;
               return svg`${shape}${outline}${label ? svg`<text class="rlabel" x="${c[0]}" y="${c[1]}">${r.name}</text>` : nothing}`;
-            })}
+              });
+            })()}
             ${disp.fill === 'glow' && !this._markup ? this._renderGlowLayer(space) : nothing}
             ${this._renderOpenWalls(disp)}
             ${this._editing ? this._renderAlignGuides() : nothing}