Bank sync support

[jjmata]

Describe the feature

Add the simplest possible way to get transaction-level bank data imported/synchronized going forward to eliminate onboarding friction.

Why is this feature important?

The biggest hurdle/friction point when using personal finance/budgeting tools is: (1) getting the data in, (2) cleaning up/categorizing the data. If we do this well, the rest of the work can begin!

Additional context, screenshots, and relevant links

No response

[jjmata]

Wanted to start a discussion given all the work going on to document Plaid sync (#1), implement SimpleFIN (#101) and Lunch Flow (#102), etc.

We've already agreed that a Bank Sync tab is in order to keep all this stuff organized as part of the Lunch Flow work, and there are other ways to do this via API (like this n8n workflow) which could be documented either in the repo or via UI.

What I want to recognize here as well is that one of the big reasons a lot of us got interested in this codebase was the elegant, simple design that @justinfar (👋 ) was able to accomplish, so let's keep that in mind before all of our "engineer UI" ends up destroying the great balance he accomplished thus far.