Harden SQLite migration and apply post-merge fixes

Migration hardening:
- Back up JSON to $PASEO_HOME/backup/pre-migration/ before import
- Deduplicate projects/workspaces by path before insert
- Log per-batch progress during agent snapshot import
- Clear error messages for corrupt JSON files
- 5 new test cases for backup, dedup, progress, and error clarity

Post-merge fixes:
- Add worktreeRoot to session checkout result (type error fix)
- Port reload agent tab action from main
- Remove deleted useDelayedHistoryRefreshToast hook usage

packages/app/src/panels/agent-panel.tsx

@@ -20,7 +20,6 @@ import {
   type AgentScreenMissingState,
 } from "@/hooks/use-agent-screen-state-machine";
 import { useArchiveAgent } from "@/hooks/use-archive-agent";
-import { useDelayedHistoryRefreshToast } from "@/hooks/use-delayed-history-refresh-toast";
 import { useAgentInputDraft } from "@/hooks/use-agent-input-draft";
 import { useKeyboardShiftStyle } from "@/hooks/use-keyboard-shift-style";
 import { useStableEvent } from "@/hooks/use-stable-event";
@@ -808,28 +807,6 @@ function ChatAgentContent({
     setMissingAgentState({ kind: "idle" });
   }, [agentId, serverId]);
 
-  const isHistoryRefreshCatchingUp =
-    viewState.tag === "ready" &&
-    viewState.sync.status === "catching_up" &&
-    viewState.sync.ui === "toast";
-  const shouldEmitSyncErrorToast =
-    viewState.tag === "ready" &&
-    viewState.sync.status === "sync_error" &&
-    viewState.sync.shouldEmitSyncErrorToast;
-
-  useDelayedHistoryRefreshToast({
-    isCatchingUp: isHistoryRefreshCatchingUp,
-    indicatorColor: theme.colors.primary,
-    showToast: panelToast.api.show,
-  });
-
-  useEffect(() => {
-    if (!shouldEmitSyncErrorToast) {
-      return;
-    }
-    panelToast.api.error("Failed to refresh agent. Retrying in background.");
-  }, [panelToast.api, shouldEmitSyncErrorToast]);
-
   if (viewState.tag === "not_found") {
     return (
       <View style={styles.container} testID="agent-not-found">