Add 'Use default collection folder' recovery option for collection path mismatch

[Giyutomioka-SS]

Purpose / Description

When the stored collection path is wrong or no longer exists (e.g. legacy vs app-specific path), the "Error handling" screen had no way to fix it. This change adds a "Use default collection folder" option on that screen so the user can reset the path to the default and exit. On the next launch the app opens from the correct folder or creates a new collection there.

Fixes

• Fixes "Collection not opened" is not actionable if the collection path no longer exists #17524

Approach

When the database error dialog appears, we show a new "use default folder" option only if the current folder is not already the default one. If the user taps it, we close the collection, reset the folder path back to default, and exit the app. Next time the app opens, it uses the default folder. This follows the same close-reset-finish pattern already used elsewhere in the app.

How Has This Been Tested?

Reproduced the bug by setting a wrong path in prefs and a fake DB at that path on emulator.

Screen Recording

Screen_recording_20260225_172356.webm

Checklist

Please, go through these checks before submitting the PR.

• You have a descriptive commit message with a short title (first line, max 50 chars).
• You have commented your code, particularly in hard-to-understand areas
• You have performed a self-review of your own code
• UI changes: include screenshots of all affected screens (in particular showing any new or changed strings)
• UI Changes: You have tested your change using the Google Accessibility Scanner

[github-actions]

Important

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[criticalAY]

I am not able get how you reproduced it, you edited the pref in data/data...? could you mention the exact steps

[Giyutomioka-SS]

@criticalAY On an Android 14 emulator with fullDebug (com.ichi2.anki.debug):

1. Install and launch once so a normal collection is created at the default path, then close the app.

2. Change the stored collection path in prefs to a bad location:

   adb shell run-as com.ichi2.anki.debug \
   "sed -i 's#/storage/emulated/0/AnkiDroid#/storage/emulated/0/Android/com.ichi2.anki.debug/files/AnkiDroid#g' shared_prefs/com.ichi2.anki.debug_preferences.xml"
   

3. Put a fake DB only at that bad path:

   adb shell 'rm -rf /storage/emulated/0/Android/com.ichi2.anki.debug/files/AnkiDroid && \
   mkdir -p /storage/emulated/0/Android/com.ichi2.anki.debug/files/AnkiDroid && \
   echo "not a real sqlite db" > /storage/emulated/0/Android/com.ichi2.anki.debug/files/AnkiDroid/collection.anki2'
   

4. Force stop and relaunch the app:

   adb shell am force-stop com.ichi2.anki.debug
   adb shell monkey -p com.ichi2.anki.debug -c android.intent.category.LAUNCHER 1
   

5. You should see “Collection not opened” then, after tapping Options, the Error handling dialog with the new “Use default collection folder” option.