fix(storage): resolve MediaStore URIs before scoped requests

[sjug]

Type of change(s)

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

What changed and why

• Added async MediaStore URI resolution for scoped-storage file operations.
• Uses public MediaScannerConnection.scanFile(...) and verifies resolved MediaStore IDs before passing URIs to Android R+ write/delete/trash requests.
• Prevents invalid request URIs like content://media/external/images/media/0.
• Hardens SDK 30 request helpers so empty URI lists and exceptions invoke callback(false).
• Deprecates older unsafe helpers and makes FileDirItem.assembleContentUri() nullable instead of fabricating invalid IDs.
• Fails rename batches when any item cannot be resolved instead of silently skipping unresolved files.

This is a breaking API/behavior change and is intended for the next major commons release, e.g. 7.0.0.

Required by the Gallery scoped-storage overwrite-save fix for FossifyOrg/Gallery#1031.

Tests performed

• ./gradlew :commons:compileDebugKotlin
• ./gradlew :commons:publishToMavenLocal
• Verified with Fossify Gallery debug build using the locally published commons artifact.
• Runtime-tested Gallery crop overwrite-save flow on Android 16 / Pixel device; no invalid /media/0 URI crash.

Before & after preview

N/A — no UI changes.

Closes the following issue(s)

N/A — prerequisite library fix for FossifyOrg/Gallery#1031.

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; no CHANGELOG.md exists in this repo).
• I have self-reviewed my pull request (no typos, formatting errors, etc.).
• I understand every change in this pull request.