[xO-ox-ai]

Automatic upload currently skips every zero-byte file, including intentional empty files. Allow an empty regular file once its valid filesystem modification time is at least one hour old. Recently modified empty files remain deferred, and files that gain content can upload immediately. Preserve the camera/MediaStore comment and add an explanation for the grace period.

Deferred files remain pending for the next automatic scan; this does not schedule an upload exactly one hour later. Unknown or future modification times remain deferred. No additional write-state checks are introduced.

Validation

• 10 focused unit tests passed, covering the one-hour boundary, modification-time changes, empty-to-nonempty transitions, invalid/future timestamps, missing files and directories.
• Gplay debug Kotlin/Java compilation passed.
• Android lint passed: 0 errors, 0 warnings, 3 hints outside the changed files.
• spotlessKotlinCheck, detekt and git diff --check passed.
• Tested locally with Java 21 and cached Gradle 9.8.2.
• Running SpotBugs separately with an argument file produced 250 findings across the project's Java classes and reported missing analysis classes; this is not a clean SpotBugs result. No Java source files are changed by this PR.

Checklist

• Tests are included.
• PR title describes the behavior.
• Human review and contributor DCO sign-off.

AI assistance

• This PR was generated with assistance from OpenAI Codex (GPT-6).