Extensions: hub bridge for tasks, contacts and calendar (asked of the person once), Sites in My Store, and four example extensions

- hub.tasks / hub.contacts / hub.calendar in the extension sandbox; each kind of access is approved by the person and remembered per extension
- My Store: Sites kind (any web link, optionally shown inside the hub)
- Examples: notes and checklists, habit tracker, kitchen converter and scaler, weather and verse of the day

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

docs/extensions/tracker.html

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+<!doctype html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1"><title>Habits</title>
+<style>
+:root{--bg:#fff;--fg:#1b1e24;--mut:#6b7280;--line:#e0e3e9;--acc:#2f9e6e;--card:#f4f5f8}@media(prefers-color-scheme:dark){:root{--bg:#181b21;--fg:#eceef2;--mut:#8b93a3;--line:#2a2f38;--acc:#3dbb85;--card:#20242c}}
+*{box-sizing:border-box}body{margin:0;padding:14px;font:15px system-ui,sans-serif;background:var(--bg);color:var(--fg)}h2{margin:0 0 10px}
+input,button{font:inherit;color:inherit;background:var(--card);border:1px solid var(--line);border-radius:8px;padding:8px}button{cursor:pointer}button.p{background:var(--acc);color:#fff;border-color:var(--acc)}
+.h{background:var(--card);border-radius:12px;padding:12px;margin:0 0 12px}.top{display:flex;gap:8px;align-items:center}.top b{flex:1}.streak{color:var(--mut);font-size:13px}
+.g{display:grid;grid-template-columns:repeat(14,1fr);gap:3px;margin-top:10px}.g i{aspect-ratio:1;border-radius:3px;background:var(--line)}.g i.y{background:var(--acc)}.g i.t{outline:2px solid var(--fg)}
+</style></head><body><h2>Habits</h2><div id="hs"></div>
+<form id="f" style="display:flex;gap:6px"><input id="nh" placeholder="New habit (for example Read the Bible)" style="flex:1" required><button class="p">Add</button></form>
+<script>
+var habits=[],timer;
+function save(){clearTimeout(timer);timer=setTimeout(function(){hub.storage.set('habits',habits)},300)}
+function key(d){var m=d.getMonth()+1,x=d.getDate();return d.getFullYear()+'-'+(m<10?'0':'')+m+'-'+(x<10?'0':'')+x}
+function back(n){var d=new Date();d.setDate(d.getDate()-n);return key(d)}
+function streak(h){var s=0,i=h.days[back(0)]?0:1;while(h.days[back(i)]){s++;i++}return s}
+function esc(s){return String(s).replace(/[&<>"]/g,function(c){return{'&':'&amp;','<':'&lt;','>':'&gt;','"':'&quot;'}[c]})}
+function draw(){document.getElementById('hs').innerHTML=habits.map(function(h,i){var cells='';for(var k=27;k>=0;k--){var d=back(k);cells+='<i class="'+(h.days[d]?'y':'')+(k===0?' t':'')+'" title="'+d+'"></i>'}
+var done=h.days[back(0)];return '<div class="h"><div class="top"><b>'+esc(h.name)+'</b><span class="streak">'+streak(h)+' day streak</span><button class="'+(done?'':'p')+'" data-t="'+i+'">'+(done?'Done today':'Check in')+'</button><button data-x="'+i+'" title="Delete">x</button></div><div class="g">'+cells+'</div></div>'}).join('')||'<p style="color:var(--mut)">Add a habit to start a streak.</p>';
+[].forEach.call(document.querySelectorAll('[data-t]'),function(b){b.onclick=function(){var h=habits[+b.dataset.t],t=back(0);if(h.days[t])delete h.days[t];else h.days[t]=1;save();draw()}});
+[].forEach.call(document.querySelectorAll('[data-x]'),function(b){b.onclick=function(){if(confirm('Delete this habit and its history?')){habits.splice(+b.dataset.x,1);save();draw()}}})}
+document.getElementById('f').onsubmit=function(e){e.preventDefault();var v=document.getElementById('nh').value.trim();if(v){habits.push({name:v,days:{}});document.getElementById('nh').value='';save();draw()}};
+hub.storage.get('habits').then(function(v){habits=Array.isArray(v)?v:[{name:'Read the Bible',days:{}}];draw()});
+</script></body></html>