feat(pwa): installable app — manifest + SW + Settings install button

The captive-portal Step-2 QR opens pictureframe.edholm.me in Safari,
which is the perfect moment to also offer "pin this to your home
screen" so the recipient gets one-tap access without typing the URL
again. Two pieces:

* Service worker at /sw.js (document root, scope "/"). Minimal —
  install/activate calls skipWaiting + clients.claim, fetch is
  passthrough. Real offline caching is intentionally out of scope;
  we only need the SW to exist so Chrome's PWA-install heuristic
  fires.

* Settings → Install app section, hidden when display-mode standalone.
  Android Chrome path: native beforeinstallprompt button.
  iOS Safari (and any other non-prompt browser): button opens a
  modal with step-by-step Share → Add to Home Screen instructions.

usePwaInstall composable handles the singleton lifecycle —
beforeinstallprompt fires once per page load and may fire before the
user navigates to Settings, so we register on module import and stash
the event for later.

Tests cover: install button rendered when not standalone, modal opens
on click without a native prompt, modal close button works.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

public/build/assets/SettingsView-BuwptVaB.js

@@ -0,0 +1 @@
+import{G as e,H as t,J as n,K as r,M as i,P as a,S as o,b as s,f as c,g as l,h as u,p as d,q as f,t as p,v as m,y as h}from"./_plugin-vue_export-helper-eepT72yB.js";import{n as g,r as _,t as v}from"./index-BO5caB_f.js";var y=t(null),b=t(!1);function x(){return typeof window>`u`?!1:window.matchMedia?.(`(display-mode: standalone)`).matches?!0:window.navigator.standalone===!0}function S(){if(typeof navigator>`u`)return!1;let e=navigator.userAgent,t=e.includes(`Mac`)&&navigator.maxTouchPoints>1;return/iPhone|iPod/.test(e)||t}var C=!1;function w(){C||typeof window>`u`||(C=!0,b.value=x(),window.addEventListener(`beforeinstallprompt`,e=>{e.preventDefault(),y.value=e}),window.addEventListener(`appinstalled`,()=>{y.value=null,b.value=!0}),window.matchMedia?.(`(display-mode: standalone)`).addEventListener(`change`,e=>{b.value=e.matches}))}w();function T(){let e=S(),t=u(()=>y.value!==null);async function n(){let e=y.value;if(!e)return!1;await e.prompt();let t=await e.userChoice;return y.value=null,t.outcome===`accepted`}return{isStandalone:b,isIOS:e,canPromptInstall:t,install:n}}var E={class:`settings`},D={key:0,class:`settings__section`},O={class:`settings__section`},k={class:`theme-grid`,role:`radiogroup`,"aria-label":`Choose theme`},A=[`aria-checked`,`aria-label`,`onClick`],j={class:`theme-swatch__label`},M={key:0,class:`theme-swatch__check`,"aria-hidden":`true`},N={class:`settings__section`},P={class:`settings__row`},F={class:`settings__row-value`},I={class:`install-modal__card`},L={id:`install-modal-title`,class:`install-modal__title`},R={class:`install-modal__steps`},z={key:0},B={key:1},V={key:0},H=p(o({__name:`SettingsView`,setup(o){let p=_(),{saveTheme:y}=g(),{isStandalone:b,isIOS:x,canPromptInstall:S,install:C}=T(),w=u(()=>p.user?.theme??`warm-craft`),H=t(!1);function U(e){y(e)}async function W(){!await C()&&!S.value&&(H.value=!0)}return(t,o)=>(i(),h(`main`,E,[o[18]||=l(`h1`,{class:`settings__title`},`Settings`,-1),e(b)?m(``,!0):(i(),h(`section`,D,[o[3]||=l(`h2`,{class:`settings__section-title`},`Install app`,-1),o[4]||=l(`p`,{class:`settings__hint`},` Pin pictureFrame to your home screen so it opens like a native app. `,-1),e(S)?(i(),h(`button`,{key:0,type:`button`,class:`settings__install`,onClick:W},` Install pictureFrame `)):(i(),h(`button`,{key:1,type:`button`,class:`settings__install`,onClick:o[0]||=e=>H.value=!0},` Add to Home Screen `))])),l(`section`,O,[o[6]||=l(`h2`,{class:`settings__section-title`},`Theme`,-1),l(`div`,k,[(i(!0),h(d,null,a(e(v),e=>(i(),h(`button`,{key:e.id,type:`button`,role:`radio`,"aria-checked":w.value===e.id,"aria-label":e.label,class:r([`theme-swatch`,{"theme-swatch--active":w.value===e.id}]),style:f({"--swatch-bg":e.bg,"--swatch-primary":e.primary,"--swatch-text":e.text}),onClick:t=>U(e.id)},[o[5]||=l(`span`,{class:`theme-swatch__preview`,"aria-hidden":`true`},[l(`span`,{class:`theme-swatch__bar`}),l(`span`,{class:`theme-swatch__dot`})],-1),l(`span`,j,n(e.label),1),w.value===e.id?(i(),h(`span`,M,`✓`)):m(``,!0)],14,A))),128))])]),l(`section`,N,[o[8]||=l(`h2`,{class:`settings__section-title`},`Account`,-1),l(`div`,P,[o[7]||=l(`span`,{class:`settings__row-label`},`Signed in as`,-1),l(`span`,F,n(e(p).user?.email),1)]),o[9]||=l(`a`,{href:`/logout`,class:`settings__logout`},`Sign out`,-1)]),H.value?(i(),h(`div`,{key:1,class:`install-modal`,role:`dialog`,"aria-modal":`true`,"aria-labelledby":`install-modal-title`,onClick:o[2]||=c(e=>H.value=!1,[`self`])},[l(`div`,I,[l(`button`,{type:`button`,class:`install-modal__close`,"aria-label":`Close`,onClick:o[1]||=e=>H.value=!1},`×`),l(`h2`,L,n(e(x)?`Add to your iPhone home screen`:`Add to your home screen`),1),l(`ol`,R,[e(x)?(i(),h(`li`,z,[...o[10]||=[s(` Tap the `,-1),l(`strong`,null,`Share`,-1),s(` icon at the bottom of Safari (the square with an up-arrow). `,-1)]])):(i(),h(`li`,B,[...o[11]||=[s(` Open your browser's menu (usually the three dots `,-1),l(`strong`,null,`⋮`,-1),s(` in the top right). `,-1)]])),l(`li`,null,[o[13]||=s(` Scroll down and tap `,-1),o[14]||=l(`strong`,null,`Add to Home Screen`,-1),e(x)?m(``,!0):(i(),h(`span`,V,[...o[12]||=[s(`or `,-1),l(`strong`,null,`Install app`,-1)]])),o[15]||=s(`. `,-1)]),o[16]||=l(`li`,null,[s(` Tap `),l(`strong`,null,`Add`),s(` in the top right to confirm. `)],-1)]),o[17]||=l(`p`,{class:`install-modal__footer`},` The app will appear on your home screen and open without browser chrome the next time you launch it. `,-1)])])):m(``,!0)]))}}),[[`__scopeId`,`data-v-6f8a8b72`]]);export{H as default};