refactor: add share-safe file provider helpers PR 1 [WPB-26687]

[MohamadJaara]

https://wearezeta.atlassian.net/browse/WPB-26687

Summary

• Adds share-safe FileProvider URI helpers backed by a dedicated shared cache directory.
• Routes app-generated file shares through chooser intents that can exclude Wire targets.
• Enables Android 15+ trusted share identity for Wire-origin shares.
• Updates QR/profile, feedback, avatar, and Cells share call sites to use the shared helpers.

General Idea

This stack separates “share externally” from “forward/share inside Wire” while keeping the behavior different per Android version:

• On Android 15+ we can rely on trusted share caller identity, so Wire can stay in the normal Android share sheet safely.
• On older Android versions we cannot reliably know that an incoming Wire FileProvider URI came from Wire itself, so we avoid routing Wire-internal files through the public share sheet.
• For older Android versions, internal Wire forwarding uses an explicit in-app navigation path into the import media flow.
• External sharing uses Android chooser intents and excludes Wire where needed to prevent re-importing internal Wire files.

flowchart TD
    A["User taps Share"] --> B{"Android 15+?"}

    B -- "Yes" --> C["Use Android share sheet"]
    C --> D["Enable share identity"]
    D --> E["Wire target can be trusted"]

    B -- "No" --> F{"Target action"}
    F -- "Share externally" --> G["Open external chooser"]
    G --> H["Exclude Wire targets"]

    F -- "Share via Wire" --> I["Create shared-cache FileProvider URI"]
    I --> J["Navigate directly to ImportMediaScreen"]
    J --> K["Validate URI is from Wire shared_files root"]
    K --> L["Import as pending asset"]

Loading

Stack

This PR is part of a stacked series:

1. mo/share-forward-01-share-plumbing
   Share-safe FileProvider helpers and chooser behavior.

2. mo/share-forward-02-import-safety
   Incoming share validation and trusted Wire caller handling.

3. mo/share-forward-03-asset-actions
   UI split between “Share via Wire” and “Share externally”.

4. mo/share-forward-04-log-sharing
   Share logs as one archive, either externally or via Wire.

5. mo/share-forward-05-stability-baselines
   Generated stability baseline updates.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[ohassine]

Could you clarify this part? It looks like we're creating a new file, but I can't see where it's populated with the avatar data

[sbakhtiarov]

I think this will break Cells code from com.wire.android.feature.cells.util.FileHelper since it is not updated. Will not be able to open Cell files in external apps.

[MohamadJaara]

I think this will break Cells code from com.wire.android.feature.cells.util.FileHelper since it is not updated. Will not be able to open Cell files in external apps.

Unfortunately, there is no e2e tests to verify it but i will test it manually and if it is broken i will handle it in its own PR