feat(mobile): android widgets

[bwees]

Description

This adds widgets to Android, similar to those in #19148.

How Has This Been Tested?

Pixel 9 Pro Simulator

Checklist:

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation if applicable
• I have no unrelated changes in the PR.
• I have confirmed that any new dependencies are strictly necessary.
• I have written tests for new code (if applicable)
• I have followed naming conventions/patterns in the surrounding code
• All code in src/services/ uses repositories implementations for database calls, filesystem operations, etc.
• All code in src/repositories/ is pretty basic/simple and does not have any immich specific logic (that belongs in src/services/)

[alextran1502]

First round of testing, running in release mode, I couldn't get the widget to load. The widget keep spinning at "Loading widget" screen

[alextran1502]

Okay, finally it works in production mode. I observed a few things

• In the widget configuration screen, after selecting the album or toggling to show the album name, there is no confirmation button. The user needs to tap the close button to confirm, which is somewhat unintuitive. I think having the confirm or ok button will work better.
• A side note for hard link, I wonder if once you open the asset viewer by tapping on the asset, navigating back will bring the user to that asset on the timeline so they can continue browsing around that time frame

[bwees]

Let's have a save button and then a "are you sure you don't want to save" dialog if you hit the close button.

We can talk to @shenlong-tanwen to see if there is a possibility to have the timeline scroll to a position for the deep link

[shenlong-tanwen]

if there is a possibility to have the timeline scroll to a position for the deep link

Take a look at the handleLocateAsset method in gallery_app_bar.dart. We could probably do something similar to what it does and update the scrollToDateNotifierProvider to notify the grid to scroll to the asset's bucket

[alextran1502]

@bwees Do you want to add the confirm button to the widget setting page and get this PR merged?