Implements expense approval workflow

Adds an admin approval workflow for user-submitted expenses. This ensures that only valid expenses affect user balances.

The workflow includes pending expense states, admin approval/rejection actions, balance filtering, and UI updates.

crud.py

@@ -236,18 +236,35 @@ async def get_entry_lines(journal_entry_id: str) -> list[EntryLine]:
 
 
 async def get_all_journal_entries(limit: int = 100) -> list[JournalEntry]:
-    entries = await db.fetchall(
+    entries_data = await db.fetchall(
         """
         SELECT * FROM journal_entries
         ORDER BY entry_date DESC, created_at DESC
         LIMIT :limit
         """,
         {"limit": limit},
-        JournalEntry,
     )
 
-    for entry in entries:
+    entries = []
+    for entry_data in entries_data:
+        # Parse flag and meta from database
+        from .models import JournalEntryFlag
+        flag = JournalEntryFlag(entry_data.get("flag", "*"))
+        meta = json.loads(entry_data.get("meta", "{}")) if entry_data.get("meta") else {}
+
+        entry = JournalEntry(
+            id=entry_data["id"],
+            description=entry_data["description"],
+            entry_date=entry_data["entry_date"],
+            created_by=entry_data["created_by"],
+            created_at=entry_data["created_at"],
+            reference=entry_data["reference"],
+            flag=flag,
+            meta=meta,
+            lines=[],
+        )
         entry.lines = await get_entry_lines(entry.id)
+        entries.append(entry)
 
     return entries