Re. parenthetical v action line, my sense is that if the direction helps the reader understand an important aspect of the characters attitude, or helps the reader hear how the line is read, then a parenthetical works. For example, here is David Lynch and Mark Frost, in the pilot of Twin Peaks (assume correct formatting.)
INT. GREAT NORTHERN HOTEL DINING ROOM - DAY
Dale Cooper sits at a choice corner table, holding a fresh, hot cup of coffee, as a
WAITRESS stands by, holding the coffee pot.
COOPER
(holding up a hand to stop her)
Wait right there, wait right there....
(he sniffs the coffee; hmm ... he sips)
You know, this is, excuse me, a damn good cup of coffee. I've had I can't tell you how many cups of coffee I've had in my life and this
(another sip)
... this is one of the best.
WAITRESS
Thank you.
*
Coop's coffee sipping and sniffing could have been action lines, but I like this--reading, we see and understand something about him. A lot of it is, I think, feel, and this feels correct. It is not obtrusive; if flows.
Clara's three parentheticals tell us nothing about her, or about how the line should be read, or something we need to understand about the line, like "to X," to someone specific. And they kind of break what is, I think, a nice little bit. So they probably should be action lines.
However, the whole short bit is confusing. She goes to the cupboard, begins preparing breakfast, and then exits. I have a hard time seeing exactly what she is doing. And I don't have a sense of what's going on with her. Is she angry, here?
Anyway, maybe something like:
Clara lays out plates from the cupboard on the counter, cracks an egg into a pan on the stove. And pauses.
CLARA
I didn't know about it.
She turns and faces Xavier.
CLARA
If I'd known I'd have told you.
She abruptly exits the kitchen, leaving the eggs over the flame to burn.
*
My point is, I think, that specific is better than general. Think of your readers (here, us) and give us just enough to describe what it is that we are seeing.