Sorry if I’m mistaken, but since CC coursework is considered all lower-division, doesn’t that fall under junior level? Senior level requires at least some upper division coursework, no?
No. Class level is based solely on the number of units, so you can reach senior level units with only lower-division classes. See for example Class Levels and Upper Division Standing (Undergraduates)
Regarding your total units you should verify what I say with a counselor at your CC, a UC counselor when they visit your CC, call or submit a question online to a UC admissions office. But the way I see it is this: you get 105 transferable quarter units from units earned at your CC. Added to this as per the UC instructions below are the 31 quarter units from UCI. The grand total is 136, making you a senior level transfer.
From the pdf @Gumbymom linked to above
Students will be granted up to 70 semester (105 quarter) units for freshman/sophomore coursework completed at any institution or combination of institutions; this limitation does not apply to units earned at UC.
Units earned at any UC campus (extension, summer, cross/concurrent and regular academic-year enrollment) are not included in the limitation but are added to the maximum transfer credit allowed and may put applicants at risk of being denied admission due to excessive units.