fix: prevent duplicated widget rendering on the home screen (issue #320)

[svenburkard]

Type of change(s)

• Bug fix
• Feature / enhancement
• Infrastructure / tooling (CI, build, deps, tests)
• Documentation

What changed and why

• Fixed duplicate home screen widget rendering caused by repeated widget view creation for the same widgetId.
• Added a guard in both widget-creations to reuse an existing widget view and only update its position/size.
• This prevents stacked/overlapping/duplicated/unusable widgets reported in Duplicated widget rendering bug #320.

Tests performed

• Tested with my Pixel 9a (Android 16) with a debug trigger which can be seen inline:
  • forced repeated first-draw widget code via debug intent trigger:
    adb shell am start -n org.fossify.home.debug/org.fossify.home.activities.MainActivity -a org.fossify.home.action.DEBUG_FORCE_WIDGET_FIRST_DRAW
  • verified behavior before/after
  • before: widgets get stacked/overlapping/duplicated/unusable after debug intent trigger
  • after: no stacked/overlapping/duplicated/unusable widget after debug intent triggers anymore

Before & after preview

• Before:
  https://github.com/user-attachments/assets/3347e6df-3ca8-4985-9953-0cab65e4d97d

• After:
  https://github.com/user-attachments/assets/83c91be2-b001-4663-994d-0fff417dbe12

Closes the following issue(s)

• Closes Duplicated widget rendering bug #320

Checklist

• I read the contribution guidelines.
• I manually tested my changes on device/emulator (if applicable).
• I updated the "Unreleased" section in CHANGELOG.md (if applicable).
• I have self-reviewed my pull request (no typos, formatting errors, etc.).
• I understand every change in this pull request.

[svenburkard]

Hi @naveensingh,

I made the bug of #320 reproducible and fixed it with this PR as you can see from the before/after videos.
detect only complains because of my TODO comments, but I kept the related code blocks and comments on intention to make a review easier.

My plan was to remove the related debug code of the TODO comments after the review is done.