tui: show full session history in chat and timeline

Long sessions previously dropped older messages from the in-memory
store: the initial sync was capped at 100 and a per-event eviction
removed the oldest message whenever new ones arrived, leaving the
chat starting mid-conversation and the Timeline / Jump-to-Message
features unable to reach the missing entries.

- Remove the 100-message limit from the initial session sync so all
  historical messages are loaded.
- Remove the eviction block from the message.updated handler so older
  messages are no longer purged when new ones arrive.
- Add Locale.datetimeFull (DD/MM/YYYY HH:MM) and use it for the
  Timeline footer so each entry shows full date and time instead of
  just time.

Author: vpetrigo

packages/opencode/src/cli/cmd/tui/context/sync.tsx

@@ -268,25 +268,6 @@ export const { use: useSync, provider: SyncProvider } = createSimpleContext({
               draft.splice(result.index, 0, event.properties.info)
             }),
           )
-          const updated = store.message[event.properties.info.sessionID]
-          if (updated.length > 100) {
-            const oldest = updated[0]
-            batch(() => {
-              setStore(
-                "message",
-                event.properties.info.sessionID,
-                produce((draft) => {
-                  draft.shift()
-                }),
-              )
-              setStore(
-                "part",
-                produce((draft) => {
-                  delete draft[oldest.id]
-                }),
-              )
-            })
-          }
           break
         }
         case "message.removed": {
@@ -522,7 +503,7 @@ export const { use: useSync, provider: SyncProvider } = createSimpleContext({
           if (fullSyncedSessions.has(sessionID)) return
           const [session, messages, todo, diff] = await Promise.all([
             sdk.client.session.get({ sessionID }, { throwOnError: true }),
-            sdk.client.session.messages({ sessionID, limit: 100 }),
+            sdk.client.session.messages({ sessionID }),
             sdk.client.session.todo({ sessionID }),
             sdk.client.session.diff({ sessionID }),
           ])

packages/opencode/src/cli/cmd/tui/routes/session/dialog-timeline.tsx

@@ -31,7 +31,7 @@ export function DialogTimeline(props: {
       result.push({
         title: part.text.replace(/\n/g, " "),
         value: message.id,
-        footer: Locale.time(message.time.created),
+        footer: Locale.datetimeFull(message.time.created),
         onSelect: (dialog) => {
           dialog.replace(() => (
             <DialogMessage messageID={message.id} sessionID={props.sessionID} setPrompt={props.setPrompt} />

packages/opencode/src/util/locale.ts

@@ -14,6 +14,16 @@ export function datetime(input: number): string {
   return `${localTime} · ${localDate}`
 }
 
+export function datetimeFull(input: number): string {
+  const date = new Date(input)
+  const dd = String(date.getDate()).padStart(2, "0")
+  const mm = String(date.getMonth() + 1).padStart(2, "0")
+  const yyyy = date.getFullYear()
+  const hh = String(date.getHours()).padStart(2, "0")
+  const min = String(date.getMinutes()).padStart(2, "0")
+  return `${dd}/${mm}/${yyyy} ${hh}:${min}`
+}
+
 export function todayTimeOrDateTime(input: number): string {
   const date = new Date(input)
   const now = new Date()