[WOOMOB-2454] Improve POS catalog syncing loading UX

[malinajirka]

Description

Fixes WOOMOB-2454

Improves the POS catalog syncing screen UX for large stores where syncing can take several minutes. Adds a hint message below the exit button explaining that syncing may take a few minutes and that users can leave.

Also enables the file-based local catalog sync feature flag on debug builds.

Test Steps

1. Open POS on a debug build
2. Observe the syncing screen shows "Syncing catalog" with a spinner (if the POS opens immediately, you might need to delete your data or switch to a store you haven't synced locally yet)
3. Verify the hint text below the Exit POS button reads "Catalog syncing may take a few minutes." and "You can leave and syncing will continue in the background."
4. Tap "Exit POS" and confirm it exits correctly

Images/gif

• I have considered if this change warrants release notes and have added them to RELEASE-NOTES.txt if necessary. Use the "[Internal]" label for non-user-facing changes.

[Copilot]

Pull request overview

Improves the Woo POS catalog syncing splash UX for long-running syncs by adding clearer messaging that syncing may take a few minutes and can continue in the background, and enables the local catalog file-based approach feature flag by default on debug builds.

Changes:

• Added a new hint string and updated the syncing subtitle messaging.
• Updated the POS syncing splash UI to display the new hint + subtitle beneath the “Exit POS” button.
• Enabled WOO_POS_LOCAL_CATALOG_FILE_APPROACH by default on debug builds.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
WooCommerce/src/main/res/values/strings.xml	Adds a new syncing hint string and updates the syncing subtitle copy.
WooCommerce/src/main/kotlin/com/woocommerce/android/util/FeatureFlag.kt	Enables the local catalog file-based approach flag on debug builds by default.
WooCommerce/src/main/kotlin/com/woocommerce/android/ui/woopos/splash/WooPosSplashScreen.kt	Adjusts the syncing splash UI to show the new hint text under the exit action.

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[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce Android by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce Android
	Platform	📱 Mobile
	Flavor	Jalapeno
	Build Type	Debug
	Build Number	734
	Version	24.3-rc-3
	Application ID	com.woocommerce.android.prealpha
	Commit	cda1dad
	Installation URL	3n4vfjtdn3058

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 39.55%. Comparing base (ecb8a65) to head (cda1dad).
⚠️ Report is 137 commits behind head on trunk.

Additional details and impacted files

@@            Coverage Diff            @@
##              trunk   #15505   +/-   ##
=========================================
  Coverage     39.55%   39.55%           
+ Complexity    11235    11234    -1     
=========================================
  Files          2252     2252           
  Lines        129662   129662           
  Branches      18165    18165           
=========================================
  Hits          51290    51290           
+ Misses        73134    73133    -1     
- Partials       5238     5239    +1     

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[samiuelson]

LGTM!