chore(store): replace framed marketing screenshots with in-app captures, drop tablet set

Google Play flagged the store listing screenshots on two grounds: they read as
marketing graphics rather than the in-app experience, and the tablet shots (a
phone frame stretched onto the 7"/10" canvas) tripped the "single solid color /
corrupted" check.

Regenerate phone screenshots (en-US + es-ES) from real in-app captures with
actual usage data (goal, month analytics chart, active goal + streak). New
layout keeps the app UI dominant with a small caption instead of a large
headline over empty background. Remove the tablet screenshot sets, which are
not required to publish.

Add overwrite_screenshots: true to the listing lane so removed sets are cleared
on Play instead of appended.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: feragusper

fastlane/Fastfile

@@ -35,7 +35,9 @@ platform :android do
       timeout: 600,                                       # Timeout for the upload process (in seconds).
       skip_upload_aab: true,                              # Listing-only: do not ship a binary.
       skip_upload_apk: true,
-      skip_upload_changelogs: true                        # Changelogs bind to a release/version code.
+      skip_upload_changelogs: true,                       # Changelogs bind to a release/version code.
+      overwrite_screenshots: true                         # Clear existing Play screenshots first, so removed
+                                                          # sets (e.g. tablet) are deleted, not appended to.
     )
   end
 end