v1.46.5: audit of every automatic deletion

Owner's decision after the incident: a detached plan is never deleted, at any
age. v1.46.4 gave it a month; this makes it permanent and, more importantly,
writes the reasoning where the next change will trip over it — docs/SCOPE.md now
carries the standing rule. The component may delete a file only when a user
action says so. 'Nothing points at this any more' is not such an action, because
the two errors are not symmetrical: wasted disk is visible, cheap and
reversible; a deleted file is none of those.

Went through every other automatic deletion with the same question. One more
was wrong: houseplan/files/cleanup rmtree'd whatever folder the card named. A
partial migration leaves urls pointing into it — files/migrate deliberately does
not rewrite the ones it could not confirm — so those were live links to files
being deleted; and a wrong or stale id from any client destroyed a live device's
manuals. The server now reads the stored config under its lock and removes only
what nothing references, keeping the rest and saying so.

Also: a plan of a DELETED space now waits thirty days rather than an hour.
Deleting a space is deliberate; an hour is a short window to notice a misclick.

The rest came out clean: layout/delete and marker/room/space removal are all
confirm-guarded user actions, upload temporaries are never user-visible, and
dropping legacy 'segments' is a documented migration.

demo/srv/assets/houseplan-card.js

@@ -2561,4 +2561,4 @@ const t=globalThis,e=t.ShadowRoot&&(void 0===t.ShadyCSS||t.ShadyCSS.nativeShadow
               </button>`}
         </div>
       </div>
-    </div>`}}ps.properties={hass:{attribute:!1},_config:{state:!0},_space:{state:!0},_layout:{state:!0},_devices:{state:!0},_tip:{state:!0},_selId:{state:!0},_toast:{state:!0},_serverCfg:{state:!0},_mode:{state:!0},_tool:{state:!0},_path:{state:!0},_cursorPt:{state:!0},_mergeSel:{state:!0},_openingDialog:{state:!0},_openingInfo:{state:!0},_mergeDialog:{state:!0},_splitSel:{state:!0},_decorTool:{state:!0},_decorStyle:{state:!0},_decorDraft:{state:!0},_decorSel:{state:!0},_decorTextDialog:{state:!0},_kioskDialog:{state:!0},_kioskDots:{state:!0},_areaSel:{state:!0},_nameSel:{state:!0},_roomDialog:{state:!0},_roomEditId:{state:!0},_roomFill:{state:!0},_roomTempSrc:{state:!0},_roomHumSrc:{state:!0},_roomSrcOpen:{state:!0},_roomSrcFilter:{state:!0},_roomNameScale:{state:!0},_roomLabelScale:{state:!0},_spaceDialog:{state:!0},_infoCard:{state:!0},_rulesDialog:{state:!0},_settingsDialog:{state:!0},_importDialog:{state:!0},_markerDialog:{state:!0},_zoom:{state:!0},_view:{state:!0}},ps._touchSeen=!1,ps._noHoverMq="undefined"!=typeof window&&"function"==typeof window.matchMedia&&window.matchMedia("(hover: none)").matches,ps.styles=Ui,customElements.get("houseplan-card")||customElements.define("houseplan-card",ps),window.customCards=window.customCards||[],window.customCards.find(t=>"houseplan-card"===t.type)||window.customCards.push({type:"houseplan-card",name:"House Plan Card",description:"Interactive house plan: spaces, rooms and devices with live states and drag layout."}),console.info("%c HOUSEPLAN-CARD %c v1.46.4 ","background:#3ea6ff;color:#04121f;font-weight:700","");
+    </div>`}}ps.properties={hass:{attribute:!1},_config:{state:!0},_space:{state:!0},_layout:{state:!0},_devices:{state:!0},_tip:{state:!0},_selId:{state:!0},_toast:{state:!0},_serverCfg:{state:!0},_mode:{state:!0},_tool:{state:!0},_path:{state:!0},_cursorPt:{state:!0},_mergeSel:{state:!0},_openingDialog:{state:!0},_openingInfo:{state:!0},_mergeDialog:{state:!0},_splitSel:{state:!0},_decorTool:{state:!0},_decorStyle:{state:!0},_decorDraft:{state:!0},_decorSel:{state:!0},_decorTextDialog:{state:!0},_kioskDialog:{state:!0},_kioskDots:{state:!0},_areaSel:{state:!0},_nameSel:{state:!0},_roomDialog:{state:!0},_roomEditId:{state:!0},_roomFill:{state:!0},_roomTempSrc:{state:!0},_roomHumSrc:{state:!0},_roomSrcOpen:{state:!0},_roomSrcFilter:{state:!0},_roomNameScale:{state:!0},_roomLabelScale:{state:!0},_spaceDialog:{state:!0},_infoCard:{state:!0},_rulesDialog:{state:!0},_settingsDialog:{state:!0},_importDialog:{state:!0},_markerDialog:{state:!0},_zoom:{state:!0},_view:{state:!0}},ps._touchSeen=!1,ps._noHoverMq="undefined"!=typeof window&&"function"==typeof window.matchMedia&&window.matchMedia("(hover: none)").matches,ps.styles=Ui,customElements.get("houseplan-card")||customElements.define("houseplan-card",ps),window.customCards=window.customCards||[],window.customCards.find(t=>"houseplan-card"===t.type)||window.customCards.push({type:"houseplan-card",name:"House Plan Card",description:"Interactive house plan: spaces, rooms and devices with live states and drag layout."}),console.info("%c HOUSEPLAN-CARD %c v1.46.5 ","background:#3ea6ff;color:#04121f;font-weight:700","");