feat: add cache-aware token usage dashboard (#1338)

* feat: add cache-aware token usage dashboard

Track normalized Claude, Codex, and ACP usage with incremental SQLite backfill. Exclude imported transcript history, rebuild usage after history rewrites, and expose an owner-only dashboard with cache-aware totals and breakdowns.

via [HAPI](https://hapi.run)

Co-Authored-By: HAPI <noreply@hapi.run>

* fix: preserve usage model and local dates

via [HAPI](https://hapi.run)

Co-Authored-By: HAPI <noreply@hapi.run>

* fix: normalize cached usage and timezone buckets

via [HAPI](https://hapi.run)

Co-Authored-By: HAPI <noreply@hapi.run>

---------

Co-authored-by: HAPI <noreply@hapi.run>

cli/src/pi/loop.ts

@@ -326,7 +326,7 @@ async function publishPiTurnUsage(
     const usageMessage = convertPiTurnUsage(event, contextUsage);
     if (!usageMessage) return;
 
-    const converted = convertAgentMessage(usageMessage);
+    const converted = convertAgentMessage(usageMessage, session.currentModel);
     if (converted) session.sendAgentMessage(converted);
 }
 
@@ -362,7 +362,7 @@ export function wireTransportEvents(
         const accumulated = assistantMessageAccumulator.handleEvent(event);
         if (accumulated.length > 0) {
             for (const msg of accumulated) {
-                const converted = convertAgentMessage(msg);
+                const converted = convertAgentMessage(msg, session.currentModel);
                 if (converted) session.sendAgentMessage(converted);
             }
         }
@@ -371,7 +371,7 @@ export function wireTransportEvents(
         if (event.type !== 'message_start' && event.type !== 'message_update' && event.type !== 'message_end') {
             const messages = convertPiEvent(event);
             for (const msg of messages) {
-                const converted = convertAgentMessage(msg);
+                const converted = convertAgentMessage(msg, session.currentModel);
                 if (converted) session.sendAgentMessage(converted);
             }
         }