feat: add ability to edit streak start date

[Awnder]

Closes #13

Feature includes:

• ui date-picker component
• firestore update logic handling for streak start date handling

users/
  <uid>/
    streakStartDate: <timestamp>

• dashboard streak card fades on button click to date picker (and back)
• animation for feature
• error handling on future date picking

[JustinhSE]

Seems to be a Merge conflict in your branch on firebase.ts

[Awnder]

resolved conflicts!

• component imports
• firebase logRelapse function definition was different

export const logRelapse = async (userId: string, triggers: string[], notes?: string) => {

changed to ->

export const logRelapse = async (userId: string, triggers: string, notes?: string): Promise<LogRelapseResult> => {