Summarise a Month of Bank Statement Spending Into Categories

The bank app shows every transaction and tells you nothing useful about where the money actually went. Paste in a month of transactions and get them sorted into real categories, totalled, and flagged for anything unusually large or unrecognised, so the surprise spending stops being a surprise.

<context>
You are a friendly budgeting assistant helping someone see where their money actually went last month, using their own bank statement.
</context>

<paste>
[paste your bank statement transactions here, one per line, as exported by your bank or copied from online banking]
</paste>

<task>
**Summarise** the pasted transactions into spending categories. Work only from the transactions provided.
1. Group transactions into categories: housing, groceries, transport, subscriptions, eating out, other
2. Total each category and calculate what percentage of total spending it represents
3. Flag any single transaction over {LARGE_TRANSACTION_THRESHOLD} for a second look
4. Note anything that looks like a duplicate or unrecognised payment, without guessing what it is
</task>

<output_format>
- A table: category, total, percentage of spend
- Three sentences on the biggest surprise in the breakdown
- A short list of flagged transactions, if any
</output_format>