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Fix combine_coins ignoring --max-coin-amount and including spent coins (#20717)

* Fix combine_coins ignoring max_coin_amount and including spent coins

The `combine_coins` method in `wallet_state_manager.py` had two bugs in
its `get_coin_records()` calls:

1. The `--max-coin-amount` / `-l` CLI flag was silently ignored when
   `--target-amount` was not provided. The fill-up query at line ~3026
   did not pass `amount_range`, so `coin_selection_config` limits had
   no effect.

2. Neither `get_coin_records()` call passed `spent_range`, so both
   returned spent coins alongside unspent ones. This caused combine to
   build invalid transactions referencing already-spent coins, which
   could never confirm and left the wallet stuck at 0 spendable.

Fix: add `spent_range=UInt32Range(stop=uint32(0))` to both call sites
and `amount_range` (from `coin_selection_config`) to the fill-up query.
This matches the pattern already used by `auto_claim_coins()`.

* Add test for combine_coins spent-coin rejection and fill-up filtering

Addresses review feedback: the new ValueError for already-spent
target_coin_ids had no test coverage, and the spent_range filter on the
fill-up get_coin_records query was not exercised with spent records
present.

test_combine_coins_rejects_spent_coins covers both paths:
1. Explicitly specifying a spent coin ID raises ValueError.
2. A fill-up combine (no explicit IDs, smallest-first) with spent
   records in the DB correctly skips them and selects only unspent coins.

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