feat: search files in conversation - WPB-21647

[jullianm]

WPB-21647 [iOS] Search files in Conversation

Issue

This PR introduces a new action on the conversation search screen: the ability to search for files on a wire cells enabled conv. User will be redirected to the Files view that lists all the files for the conv with the ability to search for a specific file.

Simulator.Screen.Recording.-.Snapshots.-.2025-12-23.at.14.17.01.mov

Testing

• on a wire cells enabled conv, tap on the on the conv name, then "Search", it opens up the (legacy) search screen with a new cell "Search files" which, on tap, it opens modally the Files list for the conv + a search bar.
• on that cell, clicking on the information icon opens up an alert, and on Search files action tapped, it opens up the view like mentioned above.

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

240 tests   238 ✅  32s ⏱️
 50 suites    0 💤
  1 files      2 ❌

For more details on these failures, see this check.

Results for commit 42a15a5.

♻️ This comment has been updated with latest results.

[datadog-wireapp]

⚠️ Tests

⚠️ Warnings

🧪 2 Tests failed

testFilesView_LoadingState() from WireMessagingTests.FilesViewTests (Datadog)

FilesViewTests.swift:307: XCTAssertNil failed: "Snapshot "dark" does not match reference.

@−
"file:///Users/admin/actions-runner/_work/wire-ios/wire-ios/WireMessaging/Tests/WireMessagingTests/Resources/ReferenceImages/FilesViewTests/testFilesView_LoadingState.dark.png"
@+
"file:///Users/admin/actions-runner/_work/wire-ios/wire-ios/WireMessaging/Tests/WireMessagingTests/Resources/SnapshotResults/FilesViewTests/testFilesView_LoadingState.dark.png"

To configure output for a custom diff tool, use 'withSnapshotTesting'. For example:

    withSnapshotTesting(diffTool: .ksdiff) {
...

testFilesView_NoDataState() from WireMessagingTests.FilesViewTests (Datadog)

FilesViewTests.swift:319: XCTAssertNil failed: "Snapshot "dark" does not match reference.

@−
"file:///Users/admin/actions-runner/_work/wire-ios/wire-ios/WireMessaging/Tests/WireMessagingTests/Resources/ReferenceImages/FilesViewTests/testFilesView_NoDataState.dark.png"
@+
"file:///Users/admin/actions-runner/_work/wire-ios/wire-ios/WireMessaging/Tests/WireMessagingTests/Resources/SnapshotResults/FilesViewTests/testFilesView_NoDataState.dark.png"

To configure output for a custom diff tool, use 'withSnapshotTesting'. For example:

    withSnapshotTesting(diffTool: .ksdiff) {
...

ℹ️ Info

❄️ No new flaky tests detected

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