Can now select "today" for analytics results

[benvinegar]

Refs #3

This is different from "last 24 hours" because it only shows you data from 00:00 this morning in the user's local timezone.

Does a bunch of refactoring to make this possible:

• Adds a "Today" option to the date range selector
• All CF query functions now take the user's local tz
• getViewsGroupedByInterval (query.ts) now takes an explicit start date time, instead of calculating everything as offsets from day intervals (more flexible)
• Moves some date time calculation logic to the outer dashboard.tsx loader function (a little messy)

Screenshot:

Note I haven't done much testing when there's 0 datapoints, e.g. if you asked for "today" at 12:43 AM your local time.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 90.90909% with 13 lines in your changes are missing coverage. Please review.

Project coverage is 74.25%. Comparing base (5f37d61) to head (c5589b2).

Files	Patch %	Lines
app/routes/dashboard.tsx	90.14%	7 Missing :warning:
app/analytics/query.ts	91.66%	6 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #53 +/- ## ========================================== + Coverage 73.90% 74.25% +0.34% ========================================== Files 18 18 Lines 2150 2210 +60 Branches 141 148 +7 ========================================== + Hits 1589 1641 +52 - Misses 555 563 +8 Partials 6 6 ```

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