v1.1.0 - "correlate 1" fails: read-only ts under pandas ≥ 3, and lenc sized from the first station

Summary

correlate 1 cannot run on a current installation. Two independent failures stop it,
both reproducible on master (src/mttime/core/inversion.py, _correlate).

Environment

mttime 1.1.0 (installed from git), Python 3.12, ObsPy 1.5.0, NumPy 2.5.1,
pandas 3.0.5, linux/amd64.

1. ts[index] = shift raises under pandas >= 3

File "mttime/core/inversion.py", line 398, in _correlate
ts[index] = shift
~~^^^^^^^
ValueError: assignment destination is read-only

_correlate mutates the station table through the NumPy view returned by
self.config.station_table.ts.values. Copy-on-write is mandatory in pandas 3, so that
view is read-only:

import pandas as pd
df = pd.DataFrame({"ts": [60, 60, 60]})
v = df.ts.values
print(pd.__version__, v.flags.writeable)
v[0] = 7          # pandas 2.2.3: works, df is updated
                  # pandas 3.0.5: ValueError: assignment destination is read-only

setup.py requires pandas>=1.0, so a fresh install today resolves to pandas 3 and the
flag is unusable. Under pandas 2.2.3 the same line works and updates the table.

Start in src/mttime/core/inversion.py at _correlate and reproduce the correlate 1 command on a current pandas installation. Inspect the station-table timestamp handling and the lenc sizing described in the issue. Done means correlate 1 runs without the read-only assignment failure and sizes lenc correctly for all stations.