diff --git a/frontend/dashboard.css b/frontend/dashboard.css
index 01c78c9..b013d2f 100644
--- a/frontend/dashboard.css
+++ b/frontend/dashboard.css
@@ -264,6 +264,26 @@ textarea { resize: vertical; min-height: 120px; }
   .tomorrow-conflict-plans { grid-template-columns:1fr; }
   .tomorrow-conflict-actions { flex-direction:column; }
 }
+.week-conflict-review { margin-top:14px; }
+.week-conflict-plans { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:12px; }
+.week-conflict-plans > section { min-width:0; padding:12px; border:1px solid #31577f; border-radius:12px; background:#10233a; }
+.week-conflict-plans h4 { margin:0 0 8px; }
+.week-conflict-day { margin:0 0 10px; padding-bottom:10px; border-bottom:1px solid #31577f; }
+.week-conflict-day:last-child { margin-bottom:0; padding-bottom:0; border-bottom:0; }
+.week-conflict-day strong { display:block; color:#bfdbfe; }
+.week-conflict-actions { display:flex; gap:8px; margin-top:14px; }
+.week-conflict-actions button { min-height:44px; flex:1 1 0; }
+.week-conflict-status { min-height:1.4em; margin-top:8px; }
+.plan-today-sheet.week-conflict-mode .week-plan-dates,
+.plan-today-sheet.week-conflict-mode .mobile-plan-today-nav,
+.plan-today-sheet.week-conflict-mode #plan-today-fit,
+.plan-today-sheet.week-conflict-mode #plan-today-selected,
+.plan-today-sheet.week-conflict-mode #plan-today-available-work,
+.plan-today-sheet.week-conflict-mode .plan-today-actions { display:none; }
+@media (max-width:480px) {
+  .week-conflict-plans { grid-template-columns:1fr; }
+  .week-conflict-actions { flex-direction:column; }
+}
 .mobile-plan-today-nav { position:sticky; top:0; z-index:5; display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:4px; margin:0 -18px 10px; padding:4px 18px; background:rgba(11,21,38,.98); border-block:1px solid #2a496e; }
 .mobile-plan-today-nav button { min-width:0; min-height:44px; padding:4px; border-color:transparent; font-size:12px; }
 .mobile-plan-today-nav button[aria-current="location"] { color:#bfdbfe; background:#17365a; border-color:#31577f; }
diff --git a/frontend/dashboard.js b/frontend/dashboard.js
index 2189cfb..a409577 100644
--- a/frontend/dashboard.js
+++ b/frontend/dashboard.js
@@ -391,6 +391,7 @@
   });
   const weekPlan = createWeekPlan({
     fetchJson:fetchReviewJson,localDate:todayRollover.localDate,timeZone:todayRollover.timeZone,
+    storage:localStorage,getLogin:() => planningOwnerLogin,
   });
   function openWeekPlanner(trigger) { planningTomorrow=false; return weekWorkflow.open(trigger); }
   function renderTomorrowQueueSummary(value) {
@@ -511,6 +512,7 @@
     documentObject:document,
     check:() => Promise.all([
       syncPendingTomorrow(),
+      weekPlan.pending() ? weekPlan.flush().catch(() => false) : false,
       latestTodayPlan ? weekWorkflow.promote(latestTodayPlan) : false,
     ]),
   });
@@ -2700,6 +2702,8 @@
     weekWorkflow.clear();
     qs('#tomorrow-conflict-review').hidden = true;
     qs('#plan-today-sheet').classList.remove('tomorrow-conflict-mode');
+    qs('#week-conflict-review').hidden = true;
+    qs('#plan-today-sheet').classList.remove('week-conflict-mode');
     qs('#plan-today-sheet').hidden = true;
     document.body.classList.remove('task-overlay-open');
     if (planTodayTrigger?.dataset.mobileQueue === 'tomorrow') {
@@ -3059,6 +3063,32 @@
     requestAnimationFrame(() => keep.focus());
   }
 
+  function weekConflictMarkup(value) {
+    const days=value?.days||[];
+    if(!days.length)return '<p class="muted">Nothing planned.</p>';
+    return days.map(day=>{
+      const estimates=day.estimates||{};
+      const minutes=(day.ids||[]).reduce((total,id)=>total+(Number(estimates[id])||0),0);
+      const capacity=Number(day.capacity_minutes)||0;
+      const detail=(day.ids||[]).length+' item'+((day.ids||[]).length===1?'':'s')+
+        (minutes&&capacity?' · '+minutes+' of '+capacity+' min':'');
+      return '<p class="week-conflict-day"><strong>'+escapeHtml(day.plan_date)+'</strong>'+escapeHtml(detail)+'</p>';
+    }).join('');
+  }
+
+  function showWeekConflict(conflict) {
+    qs('#plan-today-title').textContent='Resolve Week Ahead conflict';
+    qs('#week-conflict-phone-plan').innerHTML=weekConflictMarkup(conflict.local);
+    qs('#week-conflict-server-plan').innerHTML=weekConflictMarkup(conflict.remote);
+    qs('#week-conflict-status').textContent='';
+    qs('#week-conflict-review').hidden=false;
+    qs('#plan-today-sheet').classList.add('week-conflict-mode');
+    qs('#plan-today-sheet').hidden=false;
+    document.body.classList.add('task-overlay-open');
+    const keep=qs('#keep-phone-week');
+    keep.focus();requestAnimationFrame(()=>keep.focus());
+  }
+
   function openPlanToday(trigger, navigate = true, actualMinutes = null) {
     if (!planningOwnerLogin && !weekWorkflow.active()) {
       qs('#my-work-action-status').textContent = 'Planning is unavailable until your operator identity is restored.';
@@ -3078,8 +3108,12 @@
       showTomorrowConflict(conflict);
       return;
     }
+    const weekConflict=weekWorkflow.active()?weekPlan.conflict():null;
+    if(weekConflict){showWeekConflict(weekConflict);return;}
     qs('#tomorrow-conflict-review').hidden = true;
     qs('#plan-today-sheet').classList.remove('tomorrow-conflict-mode');
+    qs('#week-conflict-review').hidden=true;
+    qs('#plan-today-sheet').classList.remove('week-conflict-mode');
     const recommendations = actualMinutes || pendingPlanActualMinutes || todayRecapView.pendingReplan()?.actual_minutes;
     pendingPlanActualMinutes = null;
     const protectProposal = pendingProtectToday;
@@ -7832,6 +7866,30 @@
     qs('#my-work-action-status').textContent = 'Saved account Tomorrow plan selected. Today was not changed.';
     closePlanToday();
   });
+  qs('#keep-phone-week').addEventListener('click', async () => {
+    const keep=qs('#keep-phone-week'),use=qs('#use-server-week');
+    keep.disabled=true;use.disabled=true;
+    qs('#week-conflict-status').textContent='Saving this phone’s complete week…';
+    try {
+      await weekPlan.keepLocal();
+      qs('#mobile-week-summary').textContent=weekPlan.summary();
+      qs('#my-work-action-status').textContent='This phone’s Week Ahead plan is saved to your account. Today was not changed.';
+      closePlanToday();
+    } catch(error) {
+      const conflict=weekPlan.conflict();
+      if(conflict)showWeekConflict(conflict);
+      qs('#week-conflict-status').textContent=error?.status===409?
+        'Week Ahead changed again. Both latest weeks are preserved; choose again.':
+        `${error.message||'Week Ahead could not be saved.'} Both weeks are still preserved.`;
+    } finally {keep.disabled=false;use.disabled=false;}
+  });
+  qs('#use-server-week').addEventListener('click', () => {
+    const adopted=weekPlan.useRemote();
+    if(!adopted)return;
+    qs('#mobile-week-summary').textContent=weekPlan.summary();
+    qs('#my-work-action-status').textContent='Saved account Week Ahead plan selected. Today was not changed.';
+    closePlanToday();
+  });
   qs('#cancel-plan-today').addEventListener('click', closePlanToday);
   qs('#plan-today-sheet').addEventListener('click', event => {
     if (event.target === qs('#plan-today-sheet')) closePlanToday();
diff --git a/frontend/index.html b/frontend/index.html
index c782d61..4aa15d7 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -481,6 +481,26 @@
       </div>
       <div class="small tomorrow-conflict-status" id="tomorrow-conflict-status" role="status" aria-live="assertive"></div>
     </section>
+    <section class="week-conflict-review" id="week-conflict-review" aria-labelledby="week-conflict-title" hidden>
+      <div class="small">Cross-device change</div>
+      <h3 id="week-conflict-title">Choose which Week Ahead plan to keep</h3>
+      <p class="small muted">Both complete weeks stay preserved until one choice succeeds. Today will not change.</p>
+      <div class="week-conflict-plans">
+        <section aria-labelledby="week-conflict-phone-title">
+          <h4 id="week-conflict-phone-title">This phone</h4>
+          <div id="week-conflict-phone-plan"></div>
+        </section>
+        <section aria-labelledby="week-conflict-server-title">
+          <h4 id="week-conflict-server-title">Saved on your account</h4>
+          <div id="week-conflict-server-plan"></div>
+        </section>
+      </div>
+      <div class="week-conflict-actions">
+        <button id="keep-phone-week" type="button">Keep this phone’s week</button>
+        <button id="use-server-week" type="button">Use saved account week</button>
+      </div>
+      <div class="small week-conflict-status" id="week-conflict-status" role="status" aria-live="assertive"></div>
+    </section>
     <nav class="mobile-plan-today-nav" aria-label="Plan Today sections">
       <button type="button" data-plan-today-section="fit" aria-current="location">Fit</button>
       <button type="button" data-plan-today-section="today">Today</button>
diff --git a/frontend/week-plan.js b/frontend/week-plan.js
index 741dbea..2b1396d 100644
--- a/frontend/week-plan.js
+++ b/frontend/week-plan.js
@@ -1,11 +1,29 @@
-function createWeekPlan({fetchJson,localDate,timeZone}={}) {
+function createWeekPlan({fetchJson,localDate,timeZone,storage,getLogin}={}) {
   let week={revision:0,timezone:null,days:[]};
+  let flushing=null;
   let lastConflict=null;
+  const storagePrefix='stackchain.week-sync.v1.';
   const cloneDay=day=>({
     plan_date:day.plan_date,ids:[...(day.ids||[])],capacity_minutes:day.capacity_minutes??null,
     estimates:{...(day.estimates||{})},
   });
-  const state=()=>({revision:week.revision,timezone:week.timezone,days:week.days.map(cloneDay)});
+  const state=()=>({revision:week.revision,timezone:week.timezone,days:week.days.map(cloneDay),
+    ...(week.sync_pending?{base_revision:week.base_revision,sync_pending:true}:{})});
+  function storageKey() {
+    const login=String(getLogin?.()||'').trim().toLowerCase();
+    return login?storagePrefix+encodeURIComponent(login):'';
+  }
+  function pending() {
+    const key=storageKey();
+    if(!key||!storage) return false;
+    try {
+      const value=JSON.parse(storage.getItem(key)||'null');
+      return Number.isInteger(value?.base_revision)&&Array.isArray(value?.days)?{
+        revision:value.base_revision,base_revision:value.base_revision,timezone:value.timezone||null,
+        days:value.days.map(cloneDay).sort((left,right)=>left.plan_date.localeCompare(right.plan_date)),sync_pending:true,
+      }:false;
+    } catch(_error) { return false; }
+  }
   function adopt(value) {
     if(!Number.isInteger(value?.revision)||!Array.isArray(value?.days)) return false;
     week={revision:value.revision,timezone:value.timezone||null,days:value.days.map(cloneDay)
@@ -28,7 +46,50 @@ function createWeekPlan({fetchJson,localDate,timeZone}={}) {
     const found=week.days.find(item=>item.plan_date===planDate);
     return found?cloneDay(found):{plan_date:planDate,ids:[],capacity_minutes:null,estimates:{}};
   }
-  async function load() { return adopt(await fetchJson('api/v1/week')); }
+  async function load() {
+    const queued=pending();
+    if(queued){week=queued;return state();}
+    return adopt(await fetchJson('api/v1/week'));
+  }
+  function stageDay(planDate,value) {
+    const key=storageKey();
+    if(!key||!storage) return false;
+    const queued={base_revision:Number.isInteger(week.base_revision)?week.base_revision:week.revision,
+      timezone:timeZone(),days:week.days.filter(item=>item.plan_date!==planDate).concat([{
+        plan_date:planDate,ids:[...(value.ids||[])],capacity_minutes:value.capacity_minutes??null,
+        estimates:{...(value.estimates||{})},
+      }]).sort((left,right)=>left.plan_date.localeCompare(right.plan_date))};
+    try { storage.setItem(key,JSON.stringify(queued)); }
+    catch(_error) { return false; }
+    lastConflict=null;
+    week={revision:queued.base_revision,...queued,sync_pending:true};
+    return state();
+  }
+  function deliveryBody(value) {
+    return {base_revision:value.base_revision,timezone:value.timezone,days:value.days.map(cloneDay)};
+  }
+  function flush() {
+    if(flushing) return flushing;
+    const queued=pending();
+    const key=storageKey();
+    if(!queued||!key) return Promise.resolve(false);
+    const body=deliveryBody(queued);
+    flushing=fetchJson('api/v1/week',{method:'PUT',headers:{'Content-Type':'application/json'},body:JSON.stringify(body)})
+      .then(saved=>{
+        const current=pending();
+        if(current&&JSON.stringify(deliveryBody(current))===JSON.stringify(body)) storage.removeItem(key);
+        if(!pending()) adopt(saved);
+        return saved;
+      }).catch(async error=>{
+        if(error?.status===409){
+          const remote=await fetchJson('api/v1/week');
+          lastConflict={key,local:pending(),remote:{revision:remote.revision,timezone:remote.timezone||null,
+            days:remote.days.map(cloneDay)}};
+        }
+        throw error;
+      }).finally(()=>{flushing=null;});
+    return flushing;
+  }
   async function saveDay(planDate, value) {
     const local={revision:week.revision,timezone:timeZone(),days:week.days
       .filter(item=>item.plan_date!==planDate).concat([{
@@ -47,12 +108,42 @@ function createWeekPlan({fetchJson,localDate,timeZone}={}) {
     }
   }
   function conflict() {
-    return lastConflict?{
+    return lastConflict&&(!lastConflict.key||lastConflict.key===storageKey())?{
       local:{...lastConflict.local,days:lastConflict.local.days.map(cloneDay)},
       remote:{...lastConflict.remote,days:lastConflict.remote.days.map(cloneDay)},
     }:null;
   }
+  async function keepLocal() {
+    if(!lastConflict||lastConflict.key!==storageKey()) return false;
+    const conflictKey=lastConflict.key;
+    const local={...lastConflict.local,days:lastConflict.local.days.map(cloneDay)};
+    const body=deliveryBody({...local,base_revision:lastConflict.remote.revision});
+    try {
+      const saved=await fetchJson('api/v1/week',{method:'PUT',headers:{'Content-Type':'application/json'},body:JSON.stringify(body)});
+      const current=pending();
+      if(current&&JSON.stringify(deliveryBody(current))===JSON.stringify(deliveryBody(local))) storage.removeItem(storageKey());
+      if(!pending()) adopt(saved);
+      lastConflict=null;
+      return saved;
+    } catch(error) {
+      if(error?.status===409){
+        const remote=await fetchJson('api/v1/week');
+        lastConflict={key:conflictKey,local,remote:{revision:remote.revision,timezone:remote.timezone||null,
+          days:remote.days.map(cloneDay)}};
+      }
+      throw error;
+    }
+  }
+  function useRemote() {
+    if(!lastConflict||lastConflict.key!==storageKey()) return false;
+    const remote=lastConflict.remote;
+    storage.removeItem(storageKey());
+    const adopted=adopt(remote);
+    lastConflict=null;
+    return adopted;
+  }
   async function promote(todayRevision) {
+    if(pending()||conflict()) return false;
     const due=week.days.find(item=>item.plan_date<=localDate()&&item.ids.length);
     if(!due) return false;
     return fetchJson('api/v1/week/promote',{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify({
@@ -63,9 +154,10 @@ function createWeekPlan({fetchJson,localDate,timeZone}={}) {
   function summary() {
     const planned=week.days.filter(item=>item.ids.length);
     const items=planned.reduce((total,item)=>total+item.ids.length,0);
-    return planned.length?`${items} item${items===1?'':'s'} across ${planned.length} day${planned.length===1?'':'s'}`:'Nothing planned';
+    const label=planned.length?`${items} item${items===1?'':'s'} across ${planned.length} day${planned.length===1?'':'s'}`:'Nothing planned';
+    return label+(pending()?' · sync pending':'');
   }
-  return {adopt,state,dates,day,load,saveDay,conflict,promote,summary};
+  return {adopt,state,dates,day,load,saveDay,stageDay,pending,flush,conflict,keepLocal,useRemote,promote,summary};
 }
 function createWeekPlanWorkflow({controller,qs,getLogin,openPlanner,escapeHtml,escapeAttribute,
   todayWork,refresh,warm}={}) {
@@ -90,8 +182,12 @@ function createWeekPlanWorkflow({controller,qs,getLogin,openPlanner,escapeHtml,e
   }
   function save(plan){
     const date=selectedDate,normalized=Array.isArray(plan)?{ids:plan,capacity_minutes:null,estimates:{}}:plan;
-    controller.saveDay(date,normalized).then(()=>{qs('#mobile-week-summary').textContent=controller.summary();qs('#my-work-action-status').textContent=(normalized.ids.length?'Week Ahead saved for ':'Week Ahead cleared for ')+date+'.';})
-      .catch(error=>{qs('#mobile-week-summary').textContent=controller.conflict()?'Conflict · review required':'Unavailable · tap to retry';qs('#my-work-action-status').textContent=controller.conflict()?'Another device changed Week Ahead. Both versions are preserved; reopen Week Ahead to review.':(error.message||'Week Ahead could not be saved.')+' Retry when connected.';});
+    const staged=controller.stageDay(date,normalized);
+    if(!staged){qs('#my-work-action-status').textContent='Week Ahead could not be saved on this phone. Free browser storage and retry.';return false;}
+    qs('#mobile-week-summary').textContent=controller.summary();
+    qs('#my-work-action-status').textContent='Week Ahead saved on this phone · sync pending.';
+    controller.flush().then(()=>{qs('#mobile-week-summary').textContent=controller.summary();qs('#my-work-action-status').textContent=(normalized.ids.length?'Week Ahead saved for ':'Week Ahead cleared for ')+date+'.';})
+      .catch(error=>{qs('#mobile-week-summary').textContent=controller.conflict()?'Conflict · review required':controller.summary();qs('#my-work-action-status').textContent=controller.conflict()?'Another device changed Week Ahead. Both versions are preserved; open Week Ahead to choose one.':(error.message||'Week Ahead sync is unavailable.')+' Saved on this phone · sync pending.';});
     return true;
   }
   async function promote(plan){
diff --git a/tests/test_week_plan_frontend.py b/tests/test_week_plan_frontend.py
index 87764d6..a34a09f 100644
--- a/tests/test_week_plan_frontend.py
+++ b/tests/test_week_plan_frontend.py
@@ -67,6 +67,143 @@ console.log(JSON.stringify({conflict:week.conflict(),state:week.state()}));
     assert result["state"]["revision"] == 7
 
 
+def test_week_controller_restores_an_account_bound_week_before_network_delivery():
+    result = run_controller("""
+const values=new Map();
+const storage={getItem:key=>values.get(key)||null,setItem:(key,value)=>values.set(key,value),removeItem:key=>values.delete(key)};
+let login='Timmy';
+let requests=0;
+const options={storage,getLogin:()=>login,fetchJson:async()=>{requests+=1;throw new Error('offline');},
+  localDate:()=> '2026-08-20',timeZone:()=> 'America/New_York'};
+const first=createWeekPlan(options);
+first.adopt({revision:7,timezone:'UTC',days:[{plan_date:'2026-08-21',ids:['old'],capacity_minutes:30,estimates:{old:15}}]});
+const queued=first.stageDay('2026-08-22',{ids:['issue:r:3:','issue:r:2:'],capacity_minutes:120,
+  estimates:{'issue:r:3:':45,'issue:r:2:':30}});
+const restored=await createWeekPlan(options).load();
+login='alexander';
+let otherError='';
+try { await createWeekPlan(options).load(); } catch(error) { otherError=error.message; }
+console.log(JSON.stringify({queued,restored,requests,otherError,keys:[...values.keys()]}));
+""")
+
+    assert result["queued"]["sync_pending"] is True
+    assert result["restored"] == result["queued"]
+    assert result["restored"]["timezone"] == "America/New_York"
+    assert [day["plan_date"] for day in result["restored"]["days"]] == ["2026-08-21", "2026-08-22"]
+    assert result["requests"] == 1
+    assert result["otherError"] == "offline"
+    assert result["keys"] == ["stackchain.week-sync.v1.timmy"]
+
+
+def test_week_controller_flushes_once_and_removes_only_the_matching_pending_week():
+    result = run_controller("""
+const values=new Map();
+const storage={getItem:key=>values.get(key)||null,setItem:(key,value)=>values.set(key,value),removeItem:key=>values.delete(key)};
+let release;
+let requests=0;
+const fetchJson=async(_url,options={})=>{
+ requests+=1;const body=JSON.parse(options.body);
+ await new Promise(resolve=>{release=resolve});
+ return {revision:9,timezone:body.timezone,days:body.days};
+};
+const week=createWeekPlan({storage,getLogin:()=> 'timmy',fetchJson,localDate:()=> '2026-08-20',timeZone:()=> 'UTC'});
+week.adopt({revision:8,timezone:'UTC',days:[]});
+week.stageDay('2026-08-21',{ids:['phone'],capacity_minutes:60,estimates:{phone:30}});
+const first=week.flush(),second=week.flush();
+await Promise.resolve();
+const during=week.pending();
+release();
+const [saved,reused]=await Promise.all([first,second]);
+console.log(JSON.stringify({requests,during,saved,reused,pendingAfter:week.pending(),state:week.state()}));
+""")
+
+    assert result["requests"] == 1
+    assert result["during"]["days"][0]["ids"] == ["phone"]
+    assert result["saved"]["revision"] == 9
+    assert result["reused"]["revision"] == 9
+    assert result["pendingAfter"] is False
+    assert result["state"]["revision"] == 9
+
+
+def test_week_controller_keeps_phone_week_by_rebasing_onto_the_latest_revision():
+    result = run_controller("""
+const values=new Map();
+const storage={getItem:key=>values.get(key)||null,setItem:(key,value)=>values.set(key,value),removeItem:key=>values.delete(key)};
+const requests=[];let puts=0;
+const remote={revision:12,timezone:'UTC',days:[{plan_date:'2026-08-21',ids:['server'],capacity_minutes:60,estimates:{}}]};
+const fetchJson=async(_url,options={})=>{
+ requests.push({method:options.method||'GET',body:options.body?JSON.parse(options.body):null});
+ if(options.method==='PUT'&&puts++===0){const error=new Error('changed');error.status=409;throw error;}
+ if(options.method==='PUT')return {revision:13,timezone:'UTC',days:JSON.parse(options.body).days};
+ return remote;
+};
+const week=createWeekPlan({storage,getLogin:()=> 'timmy',fetchJson,localDate:()=> '2026-08-20',timeZone:()=> 'UTC'});
+week.adopt({revision:11,timezone:'UTC',days:[]});
+week.stageDay('2026-08-21',{ids:['phone'],capacity_minutes:90,estimates:{phone:45}});
+try { await week.flush(); } catch(_error) {}
+const before=week.conflict();
+const saved=await week.keepLocal();
+console.log(JSON.stringify({before,saved,requests,pending:week.pending(),conflict:week.conflict()}));
+""")
+
+    assert result["before"]["local"]["days"][0]["ids"] == ["phone"]
+    assert result["before"]["remote"]["days"][0]["ids"] == ["server"]
+    assert [request["method"] for request in result["requests"]] == ["PUT", "GET", "PUT"]
+    assert result["requests"][2]["body"]["base_revision"] == 12
+    assert result["saved"]["revision"] == 13
+    assert result["pending"] is False
+    assert result["conflict"] is None
+
+
+def test_week_controller_refreshes_account_week_after_a_second_conflict():
+    result = run_controller("""
+const values=new Map();
+const storage={getItem:key=>values.get(key)||null,setItem:(key,value)=>values.set(key,value),removeItem:key=>values.delete(key)};
+let revision=12;
+const fetchJson=async(_url,options={})=>{
+ if(options.method==='PUT'){const error=new Error('changed again');error.status=409;throw error;}
+ return {revision:revision++,timezone:'UTC',days:[{plan_date:'2026-08-21',ids:['server-'+(revision-1)],capacity_minutes:60,estimates:{}}]};
+};
+const week=createWeekPlan({storage,getLogin:()=> 'timmy',fetchJson,localDate:()=> '2026-08-20',timeZone:()=> 'UTC'});
+week.adopt({revision:11,timezone:'UTC',days:[]});
+week.stageDay('2026-08-21',{ids:['phone'],capacity_minutes:90,estimates:{}});
+try { await week.flush(); } catch(_error) {}
+try { await week.keepLocal(); } catch(_error) {}
+console.log(JSON.stringify({conflict:week.conflict(),pending:week.pending()}));
+""")
+
+    assert result["conflict"]["local"]["days"][0]["ids"] == ["phone"]
+    assert result["conflict"]["remote"]["revision"] == 13
+    assert result["conflict"]["remote"]["days"][0]["ids"] == ["server-13"]
+    assert result["pending"]["days"][0]["ids"] == ["phone"]
+
+
+def test_week_controller_uses_account_week_without_a_second_write():
+    result = run_controller("""
+const values=new Map();
+const storage={getItem:key=>values.get(key)||null,setItem:(key,value)=>values.set(key,value),removeItem:key=>values.delete(key)};
+const requests=[];
+const remote={revision:12,timezone:'UTC',days:[{plan_date:'2026-08-21',ids:['server'],capacity_minutes:60,estimates:{server:30}}]};
+const fetchJson=async(_url,options={})=>{
+ requests.push(options.method||'GET');
+ if(options.method==='PUT'){const error=new Error('changed');error.status=409;throw error;}
+ return remote;
+};
+const week=createWeekPlan({storage,getLogin:()=> 'timmy',fetchJson,localDate:()=> '2026-08-20',timeZone:()=> 'UTC'});
+week.adopt({revision:11,timezone:'UTC',days:[]});
+week.stageDay('2026-08-21',{ids:['phone'],capacity_minutes:90,estimates:{}});
+try { await week.flush(); } catch(_error) {}
+const adopted=week.useRemote();
+console.log(JSON.stringify({adopted,requests,pending:week.pending(),conflict:week.conflict(),state:week.state()}));
+""")
+
+    assert result["requests"] == ["PUT", "GET"]
+    assert result["adopted"]["days"][0]["ids"] == ["server"]
+    assert result["pending"] is False
+    assert result["conflict"] is None
+    assert result["state"]["revision"] == 12
+
+
 def test_week_controller_promotes_only_the_earliest_due_plan_with_stable_identity():
     result = run_controller("""
 const requests=[];
@@ -93,6 +230,22 @@ console.log(JSON.stringify({promoted,requests}));
     }]
 
 
+def test_week_controller_does_not_promote_a_pending_week():
+    result = run_controller("""
+const values=new Map();
+const storage={getItem:key=>values.get(key)||null,setItem:(key,value)=>values.set(key,value),removeItem:key=>values.delete(key)};
+let requests=0;
+const week=createWeekPlan({storage,getLogin:()=> 'timmy',fetchJson:async()=>{requests+=1;return {};},
+  localDate:()=> '2026-08-23',timeZone:()=> 'UTC'});
+week.adopt({revision:6,timezone:'UTC',days:[]});
+week.stageDay('2026-08-21',{ids:['oldest'],capacity_minutes:60,estimates:{}});
+const promoted=await week.promote(3);
+console.log(JSON.stringify({promoted,requests}));
+""")
+
+    assert result == {"promoted": False, "requests": 0}
+
+
 def test_mobile_week_ahead_entry_and_date_strip_are_touch_safe():
     index = (FRONTEND / "index.html").read_text()
     css = (FRONTEND / "dashboard.css").read_text()
@@ -105,3 +258,18 @@ def test_mobile_week_ahead_entry_and_date_strip_are_touch_safe():
     assert "weekWorkflow.save" in dashboard
     assert ".week-plan-dates button { min-height:44px;" in css
     assert "overflow-x:auto" in css
+
+
+def test_mobile_week_ahead_exposes_durable_save_and_touch_safe_conflict_choices():
+    index = (FRONTEND / "index.html").read_text()
+    css = (FRONTEND / "dashboard.css").read_text()
+    dashboard = (FRONTEND / "dashboard.js").read_text()
+
+    assert 'id="week-conflict-review"' in index
+    assert 'id="keep-phone-week"' in index
+    assert 'id="use-server-week"' in index
+    assert "storage:localStorage" in dashboard
+    assert "controller.stageDay" in CONTROLLER.read_text()
+    assert "weekPlan.flush" in dashboard
+    assert "week-conflict-mode" in dashboard
+    assert ".week-conflict-actions button { min-height:44px;" in css