[Advanced Orders] Expand execution conditions for trigger price and time windows

[floxxih]

The advanced order model needs richer trigger logic so users can express realistic strategies beyond the current minimal condition set.

Acceptance criteria:

• Support explicit trigger price thresholds.
• Support execution windows or validity ranges.
• Preserve partial-fill permissions where applicable.

[DavisVT]

@DavisVT has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

pls assign me to this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @DavisVT to this issue.