fix: show loader when processing video from the native gallery picker - WPB-27398

[jullianm]

WPB-27398 [iOS] Show loader when video is being processed from native gallery picker

Issue

Fixes a missing loading indicator when a video selected from the native gallery picker is being processed for a Shared Drive conversation.

• Extracted a showActivityIndicator(_:) helper on CameraKeyboardViewController that wraps the existing activityIndicator.start()/stop() calls in DispatchQueue.main.async, replacing the repeated inline dispatch blocks.
• ConversationInputBarViewController+ImagePickerDriveConversation now calls cameraKeyboardViewController?.showActivityIndicator(true) when a video is picked via the native PHPickerViewController for a Wire Drive conversation, and stops it once the video finishes loading, copying, or converting (including on early-return error paths).

Testing

• Pick a video from the native gallery picker in a Shared Drive conversation and confirm a loading indicator appears while the video is processed and disappears once the upload starts.
• Trigger the error paths (failed load, failed copy, failed conversion) and confirm the loading indicator is dismissed in each case.

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Checklist

• Title contains a reference JIRA issue number like [WPB-XXX].
• Description is filled and free of optional paragraphs.
• Adds/updates automated tests.

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UI accessibility checklist

If your PR includes UI changes, please utilize this checklist:

• Make sure you use the API for UI elements that support large fonts.
• All colors are taken from WireDesign.ColorTheme or constructed using WireDesign.BaseColorPalette.
• New UI elements have Accessibility strings for VoiceOver.

[github-actions]

Test Results

1 936 tests   1 909 ✅  2m 35s ⏱️
  304 suites     27 💤
    1 files        0 ❌

Results for commit 2cf6a01.

Summary: workflow run #30013532934
Allure report (download zip): html-report-32270-fix_show-loader-on-selected-video-from-native-picker

[Copilot]

Pull request overview

This PR addresses missing user feedback during video processing when selecting a video via the native gallery picker in a Wire Drive (Shared Drive) conversation, by ensuring a loading indicator is shown while the video is loaded/copied/converted.

Changes:

• Show the camera keyboard activity indicator at the start of Wire Drive video processing, and reliably hide it on success and early-return error paths.
• Refactor repeated DispatchQueue.main.async { activityIndicator.start()/stop() } blocks into a single showActivityIndicator(_:) helper on CameraKeyboardViewController.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
wire-ios/Wire-iOS/Sources/UserInterface/Conversation/InputBar/ConversationInputBarViewController+ImagePickerDriveConversation.swift	Shows/hides the loader around native-picker Wire Drive video load/copy/convert steps.
wire-ios/Wire-iOS/Sources/UserInterface/Conversation/InputBar/CameraKeyboard/CameraKeyboardViewController.swift	Centralizes activity-indicator toggling into showActivityIndicator(_:) and uses it in existing media flows.

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