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]

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 ⚠️
app/analytics/query.ts	91.66%	6 Missing ⚠️

Additional details and impacted files

@@            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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