fix(toolbox_reactive_scripts_editor): sort and dedupe created series before append

[pabloinigoblasco]

Summary

The reactive-script editor was leaving half-written orphan datasets behind when a user script pushed points in non-monotonic order. The datastore append path requires monotonically non-decreasing timestamps per topic, but the dialog drives the user script once per timestamp of the first loaded series (batch mode), so a script that fills a whole output series in a single call re-pushes the same points on every tick. The resulting series has timestamps that wrap back to 0, and `appendRecord` rejects them with:

failed to append record: datastore: Out-of-order timestamp: t=0 < last_timestamp=9950000000

Fix

Sort each created series by timestamp (quantized to the `int64` nanoseconds the store uses) and collapse duplicate timestamps (last value wins) before writing. This makes the write path robust to push order for any script style — the user no longer has to worry about the order in which their Lua code pushes samples.

The summary string now reports the points actually written instead of the raw push count, so duplicates collapsing don't read as a discrepancy.

Test plan

• Manual: run a Lua script that fills an output series in a single call (`for t = 0, N do push(t, ...) end`), reload it across multiple input ticks → series imports cleanly, no `Out-of-order timestamp` error.
• CI green on all matrix jobs.