Various media gallery related tweaks

[stefanceriu]

• simplify some previews
• avoid showing empty media groups
• add empty states for rooms that don't have any media
• fix taps not working on media gallery files

[github-actions]

	Warnings
⚠️	Some of the commits are missing ticket numbers. Please consider squashing all commits that don't have a tracking number.
⚠️	You seem to have made changes to views. Please consider adding screenshots.

Generated by 🚫 Danger Swift against ac70559

[pixlwave]

Nice, LGTM! 😎

[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

[codecov]

❌ 2 Tests Failed:

Tests completed	Failed	Passed	Skipped
888	2	886	0

View the top 1 failed tests by shortest run time

RoomDetailsEditScreenViewModelTests testCanEdit()

Stack Traces | 1.21s run time

XCTAssertTrue failed (UnitTests/Sources/RoomDetailsEditScreenViewModelTests.swift:35)

View the full list of 1 ❄️ flaky tests

PreviewTests test_timelineMediaPreviewDetailsView()

Flake rate in main: 28.81% (Passed 42 times, Failed 17 times)

Stack Traces | 2.84s run time

failed - Snapshot "Image" does not match reference.

@−
"file:.../__Snapshots__/PreviewTests/test_timelineMediaPreviewDetailsView-iPhone-16-pseudo.Image.png"
@+
"file:.../tmp/PreviewTests/test_timelineMediaPreviewDetailsView-iPhone-16-pseudo.Image.png"

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

    withSnapshotTesting(diffTool: .ksdiff) {
      // ...
    }

The percentage of pixels that match 0.9949837 is less than required 1.0
The lowest perceptual color precision 0.29250002 is less than required 0.98 (PreviewTests/Sources/PreviewTests.swift:84)

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