feat: preserve Today timing ledger across handoff (Closes #1276)

frontend/dashboard.js

@@ -1956,7 +1956,7 @@
     storage: localStorage,
     getLogin: () => confirmedOwnerLogin,
     onChange: snapshot => {
-      todaySessionSync?.publish(snapshot);
+      todaySessionSync?.publish(timer.sessionSnapshot());
       queueMicrotask(() => {
         if (todayLockScreen) todayLockScreen.sync(snapshot, workSession.checkpointed());
       });

frontend/today-session-sync.js

@@ -63,7 +63,7 @@ function createTodaySessionSync({
         onStatus('syncing');
         const body = {
           base_revision:current.revision, device_id:deviceId(), identity:current.identity,
-          elapsed_ms:current.elapsed_ms, running:true,
+          elapsed_ms:current.elapsed_ms, entries:current.entries, running:true,
         };
         if (Object.hasOwn(current, 'break_deadline_at')) body.break_deadline_at = null;
         const session = await fetchJson(endpoint, {
@@ -71,7 +71,7 @@ function createTodaySessionSync({
           body:JSON.stringify(body),
         });
         adopt(session);
-        timer?.adopt?.(session.identity, session.elapsed_ms, session.running);
+        timer?.adopt?.(session.identity, session.elapsed_ms, session.running, session.entries);
         return session;
       } catch (error) {
         if (error?.status === 409 || error?.code === 'session_changed') {
@@ -92,6 +92,7 @@ function createTodaySessionSync({
       const body = {
         base_revision:ownedRevision, device_id:deviceId(), identity:snapshot.identity,
         elapsed_ms:Math.max(0, Math.floor(Number(snapshot.elapsed_ms) || 0)),
+        entries:Array.isArray(snapshot.entries) ? snapshot.entries : undefined,
         running:Boolean(snapshot.running),
       };
       if (Object.hasOwn(snapshot, 'break_deadline_at') || Object.hasOwn(current || {}, 'break_deadline_at')) {
@@ -115,7 +116,7 @@ function createTodaySessionSync({
     }
   }
 
-  function publish(snapshot = timer?.snapshot?.()) {
+  function publish(snapshot = timer?.sessionSnapshot?.() || timer?.snapshot?.()) {
     snapshot = snapshot?.identity ? snapshot : latestSnapshot;
     if (!snapshot?.identity || !deviceId()) return Promise.resolve(null);
     latestSnapshot = snapshot;
@@ -166,6 +167,10 @@ function todaySessionHandoffSummary(session, item) {
     return `On break until ${end} · ready to resume here`;
   }
   const minutes = Math.max(0, Math.floor(Number(session?.elapsed_ms || 0) / 60000));
+  if (Array.isArray(session?.entries) && session.entries.length > 1) {
+    const total = session.entries.reduce((sum, entry) => sum + Math.max(0, Number(entry?.elapsed_ms) || 0), 0);
+    return `${session.entries.length} tracked items · ${Math.floor(total / 60000)} min total`;
+  }
   return `${item?.title || 'Current Today item'} · ${minutes} min elapsed`;
 }
 

frontend/today-timer.js

@@ -75,8 +75,9 @@ function createTodayTimer({ storage, getLogin, now = () => Date.now(), onChange
     entry.running = false;
     return state;
   };
-  const snapshot = (identity = '') => {
+  const snapshot = (identity = '', includeEntries = false) => {
     const state = read();
+    const sampledAt = now();
     const selected = identity || state.active_identity;
     const entry = state.entries[selected];
     const result = !selected || !entry ?
@@ -84,25 +85,42 @@ function createTodayTimer({ storage, getLogin, now = () => Date.now(), onChange
       {
         identity:selected,
         elapsed_ms:Math.max(0, Number(entry.elapsed_ms) || 0) + (entry.running ?
-          Math.max(0, now() - Number(entry.started_at ?? now())) : 0),
+          Math.max(0, sampledAt - Number(entry.started_at ?? sampledAt)) : 0),
         running:Boolean(entry.running),
       };
     const timedBreak = validBreak(state);
     if (timedBreak?.identity === selected) result.break_deadline_at = timedBreak.deadline_at;
+    if (includeEntries) {
+      result.entries = Object.entries(state.entries).slice(0, 20).map(([entryIdentity, value]) => ({
+        identity:entryIdentity,
+        elapsed_ms:Math.max(0, Math.floor(Number(value.elapsed_ms) || 0) + (value.running ?
+          Math.max(0, sampledAt - Number(value.started_at ?? sampledAt)) : 0)),
+      }));
+    }
     return result;
   };
   return {
-    adopt(identity, elapsedMs, running) {
+    adopt(identity, elapsedMs, running, entries = null) {
       if (!key() || typeof identity !== 'string' || !identity ||
           !Number.isFinite(Number(elapsedMs)) || Number(elapsedMs) < 0) return false;
+      const incoming = entries === null ? [{identity, elapsed_ms:elapsedMs}] : entries;
+      if (!Array.isArray(incoming) || incoming.length > 20) return false;
+      const seen = new Set();
+      const ledger = {};
+      for (const entry of incoming) {
+        if (typeof entry?.identity !== 'string' || !entry.identity || entry.identity.length > 500 ||
+            seen.has(entry.identity) || !Number.isFinite(Number(entry.elapsed_ms)) || Number(entry.elapsed_ms) < 0) return false;
+        seen.add(entry.identity);
+        ledger[entry.identity] = {
+          elapsed_ms:Math.floor(Number(entry.elapsed_ms)), started_at:null, running:false,
+        };
+      }
+      if (!ledger[identity] || ledger[identity].elapsed_ms !== Math.floor(Number(elapsedMs))) return false;
       const state = read();
-      settle(state);
       state.active_identity = identity;
-      state.entries[identity] = {
-        elapsed_ms:Math.floor(Number(elapsedMs)),
-        started_at:running ? now() : null,
-        running:Boolean(running),
-      };
+      state.entries = ledger;
+      state.entries[identity].started_at = running ? now() : null;
+      state.entries[identity].running = Boolean(running);
       state.away_at = null;
       state.pending_interruption = null;
       state.attention_interruption = null;
@@ -397,6 +415,7 @@ function createTodayTimer({ storage, getLogin, now = () => Date.now(), onChange
       }, 0);
     },
     snapshot,
+    sessionSnapshot:(identity = '') => snapshot(identity, true),
   };
 }