diff --git a/.prettierignore b/.prettierignore
index 37f04d0..0e82e92 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -2,4 +2,5 @@ node_modules
 dist
 coverage
 experiments
+share
 *.md
diff --git a/eslint.config.js b/eslint.config.js
index 0c82d63..ea26535 100644
--- a/eslint.config.js
+++ b/eslint.config.js
@@ -6,7 +6,14 @@ import globals from "globals";
 // eslint-disable-next-line @typescript-eslint/no-deprecated
 export default tseslint.config(
   {
-    ignores: ["dist/**", "node_modules/**", "coverage/**", "experiments/**", "public/sw.js"],
+    ignores: [
+      "dist/**",
+      "node_modules/**",
+      "coverage/**",
+      "experiments/**",
+      "public/sw.js",
+      "share/**",
+    ],
   },
   js.configs.recommended,
   ...tseslint.configs.strictTypeChecked,
diff --git a/index.html b/index.html
index bdb5da0..713d813 100644
--- a/index.html
+++ b/index.html
@@ -16,8 +16,8 @@
     <script type="module" src="/src/app/main.ts"></script>
     <noscript>
       <p role="alert">
-        Solarpunk requires JavaScript to run the app shell. Emergency information is available on the
-        printed festival materials.
+        Solarpunk requires JavaScript to run the app shell. Emergency information is available on
+        the printed festival materials.
       </p>
     </noscript>
   </body>
diff --git a/src/app/layout.ts b/src/app/layout.ts
index 4c92d9d..da2a307 100644
--- a/src/app/layout.ts
+++ b/src/app/layout.ts
@@ -40,12 +40,28 @@ export function createLayout(): {
   themeBtn.setAttribute("aria-label", "Toggle light/dark theme");
   themeBtn.onclick = () => {
     const html = document.documentElement;
-    if (html.classList.contains("dark")) { html.classList.remove("dark"); html.classList.add("light"); localStorage.setItem("theme","light"); themeBtn.textContent="☀"; }
-    else { document.documentElement.classList.remove("light"); document.documentElement.classList.add("dark"); localStorage.setItem("theme","dark"); themeBtn.textContent="◐"; }
+    if (html.classList.contains("dark")) {
+      html.classList.remove("dark");
+      html.classList.add("light");
+      localStorage.setItem("theme", "light");
+      themeBtn.textContent = "☀";
+    } else {
+      document.documentElement.classList.remove("light");
+      document.documentElement.classList.add("dark");
+      localStorage.setItem("theme", "dark");
+      themeBtn.textContent = "◐";
+    }
   };
   // Apply saved theme on load
-  if (localStorage.getItem("theme") === "dark") { document.documentElement.classList.add("dark"); document.documentElement.classList.remove("light"); themeBtn.textContent="◐"; }
-  else { document.documentElement.classList.add("light"); document.documentElement.classList.remove("dark"); themeBtn.textContent="☀"; }
+  if (localStorage.getItem("theme") === "dark") {
+    document.documentElement.classList.add("dark");
+    document.documentElement.classList.remove("light");
+    themeBtn.textContent = "◐";
+  } else {
+    document.documentElement.classList.add("light");
+    document.documentElement.classList.remove("dark");
+    themeBtn.textContent = "☀";
+  }
   header.append(themeBtn);
 
   const statusChip = document.createElement("div");
diff --git a/src/app/map.ts b/src/app/map.ts
index 3f6364c..ddd0438 100644
--- a/src/app/map.ts
+++ b/src/app/map.ts
@@ -18,7 +18,9 @@ export interface MapUrlFactory {
 
 const defaultUrls: MapUrlFactory = {
   createUrl: (blob) => URL.createObjectURL(blob),
-  revokeUrl: (url) => URL.revokeObjectURL(url),
+  revokeUrl: (url) => {
+    URL.revokeObjectURL(url);
+  },
 };
 
 export interface MapHandle {
@@ -43,7 +45,12 @@ export async function loadMapData(urls: MapUrlFactory = defaultUrls): Promise<Ma
     return { data, revoke };
   } catch {
     revoke();
-    return { data: null, revoke: () => {} };
+    return {
+      data: null,
+      revoke: () => {
+        /* nothing was created */
+      },
+    };
   }
 }
 
diff --git a/src/app/styles.css b/src/app/styles.css
index b5412a7..bc6887e 100644
--- a/src/app/styles.css
+++ b/src/app/styles.css
@@ -110,40 +110,91 @@ html {
   scroll-behavior: smooth;
 }
 html.dark {
-  --bg: #0b1411; --fg: #ede9de; --deck-bg: #0b1411; --deck-fg: #ede9de; --deck-surface: rgba(255,255,255,0.035); --deck-line: rgba(255,255,255,0.1); --accent: #75c7a9; --surface: rgba(255,255,255,0.035); --border: rgba(255,255,255,0.1);
+  --bg: #0b1411;
+  --fg: #ede9de;
+  --deck-bg: #0b1411;
+  --deck-fg: #ede9de;
+  --deck-surface: rgba(255, 255, 255, 0.035);
+  --deck-line: rgba(255, 255, 255, 0.1);
+  --accent: #75c7a9;
+  --surface: rgba(255, 255, 255, 0.035);
+  --border: rgba(255, 255, 255, 0.1);
 }
 html.light :root,
 html.light body {
-  --deck-bg: #f6f9f7; --deck-fg: #172621; --deck-fg-muted: #576b63;
-  --deck-surface: rgba(20,30,25,0.04); --deck-surface-2: rgba(20,30,25,0.06); --deck-line: rgba(20,30,25,0.12); --deck-line-2: rgba(20,30,25,0.2);
-  --deck-pine: #1f7a5f; --deck-indigo: #683ecc; --deck-rose: #d3224b; --deck-clay: #bf4622; --deck-amber: #b8610a;
-  --bg: #f6f9f7; --fg: #172621; --muted: #576b63; --accent: #1f7a5f; --surface: rgba(20,30,25,0.04); --border: rgba(20,30,25,0.12);
-  --highlight-bg: rgba(184,97,10,0.07); --highlight-border: rgba(184,97,10,0.3);
-  --chip-pink-bg: rgba(211,34,75,0.08); --chip-pink-fg: #b5244a;
-  --chip-green-bg: rgba(31,122,95,0.09); --chip-green-fg: #1f7a5f;
-  --chip-indigo-bg: rgba(104,62,204,0.08); --chip-indigo-fg: #683ecc;
-  --chip-amber-bg: rgba(184,97,10,0.09); --chip-amber-fg: #96500a;
-  --focus: #1f7a5f; --emergency: #d3224b; --emergency-contrast: #fff;
+  --deck-bg: #f6f9f7;
+  --deck-fg: #172621;
+  --deck-fg-muted: #576b63;
+  --deck-surface: rgba(20, 30, 25, 0.04);
+  --deck-surface-2: rgba(20, 30, 25, 0.06);
+  --deck-line: rgba(20, 30, 25, 0.12);
+  --deck-line-2: rgba(20, 30, 25, 0.2);
+  --deck-pine: #1f7a5f;
+  --deck-indigo: #683ecc;
+  --deck-rose: #d3224b;
+  --deck-clay: #bf4622;
+  --deck-amber: #b8610a;
+  --bg: #f6f9f7;
+  --fg: #172621;
+  --muted: #576b63;
+  --accent: #1f7a5f;
+  --surface: rgba(20, 30, 25, 0.04);
+  --border: rgba(20, 30, 25, 0.12);
+  --highlight-bg: rgba(184, 97, 10, 0.07);
+  --highlight-border: rgba(184, 97, 10, 0.3);
+  --chip-pink-bg: rgba(211, 34, 75, 0.08);
+  --chip-pink-fg: #b5244a;
+  --chip-green-bg: rgba(31, 122, 95, 0.09);
+  --chip-green-fg: #1f7a5f;
+  --chip-indigo-bg: rgba(104, 62, 204, 0.08);
+  --chip-indigo-fg: #683ecc;
+  --chip-amber-bg: rgba(184, 97, 10, 0.09);
+  --chip-amber-fg: #96500a;
+  --focus: #1f7a5f;
+  --emergency: #d3224b;
+  --emergency-contrast: #fff;
 }
 html.dark :root,
 html.dark body {
-  --deck-bg: #0b1411; --deck-fg: #ede9de; --deck-fg-muted: #96a69e;
-  --deck-surface: rgba(255,255,255,0.035); --deck-surface-2: rgba(255,255,255,0.055);
-  --deck-line: rgba(255,255,255,0.1); --deck-line-2: rgba(255,255,255,0.16);
-  --deck-pine: #75c7a9; --deck-indigo: #af97f7; --deck-rose: #fc88ab; --deck-clay: #e47958; --deck-amber: #fcc669;
-  --bg: var(--deck-bg); --fg: var(--deck-fg); --muted: var(--deck-fg-muted);
-  --accent: var(--deck-pine); --accent-contrast: var(--deck-on-accent);
-  --accent-soft: rgba(117,199,169,0.12);
-  --surface: var(--deck-surface); --border: var(--deck-line); --border-accent: rgba(117,199,169,0.32);
-  --highlight-bg: rgba(252,198,105,0.07); --highlight-border: rgba(252,198,105,0.3);
-  --chip-pink-bg: rgba(252,136,171,0.12); --chip-pink-fg: #fc88ab;
-  --chip-green-bg: rgba(117,199,169,0.12); --chip-green-fg: #75c7a9;
-  --chip-indigo-bg: rgba(175,151,247,0.12); --chip-indigo-fg: #af97f7;
-  --chip-amber-bg: rgba(252,198,105,0.12); --chip-amber-fg: #fcc669;
-  --focus: var(--deck-pine); --emergency: #fc88ab; --emergency-contrast: var(--deck-on-accent);
+  --deck-bg: #0b1411;
+  --deck-fg: #ede9de;
+  --deck-fg-muted: #96a69e;
+  --deck-surface: rgba(255, 255, 255, 0.035);
+  --deck-surface-2: rgba(255, 255, 255, 0.055);
+  --deck-line: rgba(255, 255, 255, 0.1);
+  --deck-line-2: rgba(255, 255, 255, 0.16);
+  --deck-pine: #75c7a9;
+  --deck-indigo: #af97f7;
+  --deck-rose: #fc88ab;
+  --deck-clay: #e47958;
+  --deck-amber: #fcc669;
+  --bg: var(--deck-bg);
+  --fg: var(--deck-fg);
+  --muted: var(--deck-fg-muted);
+  --accent: var(--deck-pine);
+  --accent-contrast: var(--deck-on-accent);
+  --accent-soft: rgba(117, 199, 169, 0.12);
+  --surface: var(--deck-surface);
+  --border: var(--deck-line);
+  --border-accent: rgba(117, 199, 169, 0.32);
+  --highlight-bg: rgba(252, 198, 105, 0.07);
+  --highlight-border: rgba(252, 198, 105, 0.3);
+  --chip-pink-bg: rgba(252, 136, 171, 0.12);
+  --chip-pink-fg: #fc88ab;
+  --chip-green-bg: rgba(117, 199, 169, 0.12);
+  --chip-green-fg: #75c7a9;
+  --chip-indigo-bg: rgba(175, 151, 247, 0.12);
+  --chip-indigo-fg: #af97f7;
+  --chip-amber-bg: rgba(252, 198, 105, 0.12);
+  --chip-amber-fg: #fcc669;
+  --focus: var(--deck-pine);
+  --emergency: #fc88ab;
+  --emergency-contrast: var(--deck-on-accent);
 }
 html.dark body {
-  background: radial-gradient(120% 80% at 80% -10%, rgba(14,57,44,0.55), transparent 60%), radial-gradient(90% 70% at -10% 110%, rgba(83,48,9,0.35), transparent 55%), var(--bg);
+  background:
+    radial-gradient(120% 80% at 80% -10%, rgba(14, 57, 44, 0.55), transparent 60%),
+    radial-gradient(90% 70% at -10% 110%, rgba(83, 48, 9, 0.35), transparent 55%), var(--bg);
 }
 @media (prefers-reduced-motion: reduce) {
   html {
@@ -359,7 +410,14 @@ h3 {
   line-height: 1;
 }
 .theme-btn {
-  min-height: 36px; padding: 0.25rem 0.5rem; font: inherit; background: var(--surface); border: 1px solid var(--border); border-radius: 999px; cursor: pointer; color: var(--fg);
+  min-height: 36px;
+  padding: 0.25rem 0.5rem;
+  font: inherit;
+  background: var(--surface);
+  border: 1px solid var(--border);
+  border-radius: 999px;
+  cursor: pointer;
+  color: var(--fg);
 }
 .app-header__status {
   font-size: 0.8125rem;
diff --git a/src/domain/clock/logic.ts b/src/domain/clock/logic.ts
index b053a07..35be4cd 100644
--- a/src/domain/clock/logic.ts
+++ b/src/domain/clock/logic.ts
@@ -12,15 +12,28 @@ const MS_PER_DAY = 24 * 3600 * 1000;
 /* ClockService — pure, no network, no persistence. Pure time-model logic per SPIKE-08. */
 export interface ClockService {
   correctedNow(deviceNow: number, skew: ClockSkew | null): number;
-  hasDrift(baseDevice: number, monoElapsed: number, observedDevice: number, thresholdMs?: number): boolean;
-  shouldWarnOutsideWindow(nowCorrected: number, win: FestivalWindow, skew: ClockSkew | null, opts?: ClockOptions): boolean;
+  hasDrift(
+    baseDevice: number,
+    monoElapsed: number,
+    observedDevice: number,
+    thresholdMs?: number,
+  ): boolean;
+  shouldWarnOutsideWindow(
+    nowCorrected: number,
+    win: FestivalWindow,
+    skew: ClockSkew | null,
+    opts?: ClockOptions,
+  ): boolean;
   renderInZone(epochMs: number, timeZone: string): string;
   formatEventTime(epochMs: number, timeZone: string): string;
   formatDayLabel(epochMs: number, timeZone: string): string;
   formatClockTime(epochMs: number, timeZone: string): string;
   deviceTimeZone(): string;
   dayKeyFor(epochMs: number, timeZone: string): string;
-  classifyNowNext<T extends SchedEventRef>(events: readonly T[], now: number): { now: readonly T[]; next: readonly T[] };
+  classifyNowNext<T extends SchedEventRef>(
+    events: readonly T[],
+    now: number,
+  ): { now: readonly T[]; next: readonly T[] };
 }
 
 /** Render epoch ms in festival IANA zone via Intl (offline, ECMA-402). */
@@ -72,7 +85,7 @@ export function formatClockTime(epochMs: number, timeZone: string): string {
 /** Device IANA zone for the display toggle — UTC fallback when unresolvable. */
 export function deviceTimeZone(): string {
   try {
-    return new Intl.DateTimeFormat().resolvedOptions().timeZone ?? "UTC";
+    return new Intl.DateTimeFormat().resolvedOptions().timeZone || "UTC";
   } catch {
     return "UTC";
   }
diff --git a/src/domain/map/logic.ts b/src/domain/map/logic.ts
index 445c616..7dee082 100644
--- a/src/domain/map/logic.ts
+++ b/src/domain/map/logic.ts
@@ -91,7 +91,11 @@ export function groupFacilities(
       category,
       pois: [...items].sort((a, b) => a.name.localeCompare(b.name)),
     }))
-    .sort((a, b) => (order.get(a.category) ?? Number.MAX_SAFE_INTEGER) - (order.get(b.category) ?? Number.MAX_SAFE_INTEGER));
+    .sort(
+      (a, b) =>
+        (order.get(a.category) ?? Number.MAX_SAFE_INTEGER) -
+        (order.get(b.category) ?? Number.MAX_SAFE_INTEGER),
+    );
 }
 
 /** Distinct categories present, in section order — for filter chips. */
@@ -119,14 +123,14 @@ function validLevel(value: unknown): boolean {
   const level = record(value);
   return Boolean(
     level &&
-      typeof level.id === "string" &&
-      typeof level.assetId === "string" &&
-      typeof level.width === "number" &&
-      Number.isFinite(level.width) &&
-      level.width > 0 &&
-      typeof level.height === "number" &&
-      Number.isFinite(level.height) &&
-      level.height > 0,
+    typeof level.id === "string" &&
+    typeof level.assetId === "string" &&
+    typeof level.width === "number" &&
+    Number.isFinite(level.width) &&
+    level.width > 0 &&
+    typeof level.height === "number" &&
+    Number.isFinite(level.height) &&
+    level.height > 0,
   );
 }
 
@@ -134,20 +138,20 @@ function validPoi(value: unknown): boolean {
   const poi = record(value);
   return Boolean(
     poi &&
-      typeof poi.id === "string" &&
-      typeof poi.name === "string" &&
-      typeof poi.category === "string" &&
-      typeof poi.x === "number" &&
-      Number.isFinite(poi.x) &&
-      typeof poi.y === "number" &&
-      Number.isFinite(poi.y),
+    typeof poi.id === "string" &&
+    typeof poi.name === "string" &&
+    typeof poi.category === "string" &&
+    typeof poi.x === "number" &&
+    Number.isFinite(poi.x) &&
+    typeof poi.y === "number" &&
+    Number.isFinite(poi.y),
   );
 }
 
 /** Structural map check — per-POI tolerance lives in the queries above. */
 export function narrowMapSection(value: unknown): MapSection | null {
   const section = record(value);
-  if (!section || section.section !== "map") return null;
+  if (section?.section !== "map") return null;
   const base = record(section.base);
   if (!base || !Array.isArray(base.levels) || !base.levels.every(validLevel)) return null;
   if (!Array.isArray(section.pois) || !section.pois.every(validPoi)) return null;
diff --git a/src/domain/map/types.ts b/src/domain/map/types.ts
index ca31c7c..475f204 100644
--- a/src/domain/map/types.ts
+++ b/src/domain/map/types.ts
@@ -4,7 +4,12 @@
  * optional lat/lng is a hook for future positioning only (no GPS in V1).
  * Trace: IMPLEMENTATION-CONTRACT.md §22, SPIKE-03.
  */
-import type { MapLevel, MapPoi, MapSection, PoiCategory } from "../../data/festival-package/types.js";
+import type {
+  MapLevel,
+  MapPoi,
+  MapSection,
+  PoiCategory,
+} from "../../data/festival-package/types.js";
 
 export type { MapPoi, PoiCategory };
 
diff --git a/src/ui/views/map/map.ts b/src/ui/views/map/map.ts
index dc6cb19..e4119a1 100644
--- a/src/ui/views/map/map.ts
+++ b/src/ui/views/map/map.ts
@@ -13,12 +13,7 @@ import {
   poiPosition,
   presentCategories,
 } from "../../../domain/map/logic.js";
-import type {
-  MapLevelView,
-  MapPoi,
-  MapViewData,
-  PoiCategory,
-} from "../../../domain/map/types.js";
+import type { MapLevelView, MapPoi, MapViewData, PoiCategory } from "../../../domain/map/types.js";
 
 const MIN_SCALE = 1;
 const MAX_SCALE = 4;
@@ -65,7 +60,10 @@ export function createMapView(input: MapViewData | null): HTMLElement {
     card.className = "view-placeholder";
     card.append(text("p", "The map isn't on this device yet."));
     card.append(
-      text("p", "Open with internet to get festival data — the emergency floor always works meanwhile."),
+      text(
+        "p",
+        "Open with internet to get festival data — the emergency floor always works meanwhile.",
+      ),
     );
     section.append(card);
     return section;
@@ -127,7 +125,10 @@ export function createMapView(input: MapViewData | null): HTMLElement {
     const stage = document.createElement("div");
     stage.className = "map-stage";
     stage.tabIndex = 0;
-    stage.setAttribute("aria-label", "Festival map. Drag to pan, use the zoom buttons, or arrow keys. Full facility list follows.");
+    stage.setAttribute(
+      "aria-label",
+      "Festival map. Drag to pan, use the zoom buttons, or arrow keys. Full facility list follows.",
+    );
     stage.style.touchAction = "none";
 
     const world = document.createElement("div");
@@ -216,7 +217,11 @@ export function createMapView(input: MapViewData | null): HTMLElement {
       (event) => {
         event.preventDefault();
         const rect = stage.getBoundingClientRect();
-        zoomAt(event.clientX - rect.left, event.clientY - rect.top, event.deltaY < 0 ? 1.25 : 1 / 1.25);
+        zoomAt(
+          event.clientX - rect.left,
+          event.clientY - rect.top,
+          event.deltaY < 0 ? 1.25 : 1 / 1.25,
+        );
       },
       { passive: false },
     );
@@ -300,7 +305,9 @@ export function createMapView(input: MapViewData | null): HTMLElement {
     // Filter application shared by chips + search.
     const applyMarkerVisibility = (): void => {
       const visible = new Set(
-        filterPois(input.pois, { categories: state.categories, query: state.query }).map((p) => p.id),
+        filterPois(input.pois, { categories: state.categories, query: state.query }).map(
+          (p) => p.id,
+        ),
       );
       for (const [id, marker] of markers) marker.hidden = !visible.has(id);
     };
@@ -313,7 +320,9 @@ export function createMapView(input: MapViewData | null): HTMLElement {
   } else {
     const card = document.createElement("div");
     card.className = "view-placeholder";
-    card.append(text("p", "The map image isn't downloaded — the facilities list below still works."));
+    card.append(
+      text("p", "The map image isn't downloaded — the facilities list below still works."),
+    );
     section.append(card);
   }
 
@@ -330,7 +339,14 @@ export function createMapView(input: MapViewData | null): HTMLElement {
   const paintChips = (): void => {
     for (const button of chipButtons) {
       const category = button.getAttribute("data-category") ?? "";
-      button.setAttribute("aria-pressed", String(category === "" ? state.categories.size === 0 : state.categories.has(category as PoiCategory)));
+      button.setAttribute(
+        "aria-pressed",
+        String(
+          category === ""
+            ? state.categories.size === 0
+            : state.categories.has(category as PoiCategory),
+        ),
+      );
     }
   };
   const allButton = document.createElement("button");
@@ -382,14 +398,20 @@ export function createMapView(input: MapViewData | null): HTMLElement {
   facilities.className = "map-facilities";
   section.append(facilities);
 
+  // Narrowed binding: the `!input` guard above returned early, so `input` is
+  // MapViewData from here on (captured for the closure below).
+  const data = input;
+
   function refreshFacilities(): void {
     facilities.replaceChildren();
-    const visible = filterPois(input!.pois, { categories: state.categories, query: state.query });
+    const visible = filterPois(data.pois, { categories: state.categories, query: state.query });
     if (visible.length === 0) {
-      facilities.append(text("p", input!.pois.length === 0 ? "No facilities listed." : "No facilities match."));
+      facilities.append(
+        text("p", data.pois.length === 0 ? "No facilities listed." : "No facilities match."),
+      );
       return;
     }
-    for (const group of groupFacilities(visible, input!.categories)) {
+    for (const group of groupFacilities(visible, data.categories)) {
       const heading = document.createElement("h2");
       heading.textContent = `${group.category} (${String(group.pois.length)})`;
       facilities.append(heading);
diff --git a/tests/setup.ts b/tests/setup.ts
index 1b6a4ae..4d20a74 100644
--- a/tests/setup.ts
+++ b/tests/setup.ts
@@ -16,7 +16,7 @@ class MemoryStorage implements Storage {
     this.map.clear();
   }
   getItem(key: string): string | null {
-    return this.map.has(key) ? (this.map.get(key) as string) : null;
+    return this.map.get(key) ?? null;
   }
   key(index: number): string | null {
     return [...this.map.keys()][index] ?? null;
@@ -25,7 +25,7 @@ class MemoryStorage implements Storage {
     this.map.delete(key);
   }
   setItem(key: string, value: string): void {
-    this.map.set(key, String(value));
+    this.map.set(key, value);
   }
 }