Fix the overlapping scrollbars on the room list filters on macOS.

[pixlwave]

This PR makes 2 changes:

• Fix the filters scroll view content so that if isn't clipped on the leading edge and has matching padding on the trailing edge
• Add some extra padding to the content on macOS so that any scroll bars don't overlap (the padding is then removed from the view itself so no extra space is take up). Fixes Horizontal Scrollbar overlays filters on macOS #2583

Before iPhone	After iPhone

Mouse macOS	No mouse macOS

[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

[stefanceriu]

Woo! 👏

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
908	1	907	0

View the full list of 1 ❄️ flaky tests

PreviewTests test_userProfileScreen()

Flake rate in main: 9.52% (Passed 38 times, Failed 4 times)

Stack Traces | 3.72s run time

failed - Snapshot "Verified User" does not match reference.

@−
"file:.../__Snapshots__/PreviewTests/test_userProfileScreen-iPhone-16-pseudo.Verified-User.png"
@+
"file:.../tmp/PreviewTests/test_userProfileScreen-iPhone-16-pseudo.Verified-User.png"

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

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

The percentage of pixels that match 0.892395 is less than required 1.0
The lowest perceptual color precision 0.31062502 is less than required 0.98 (PreviewTests/Sources/PreviewTests.swift:84)

To view more test analytics, go to the Test Analytics Dashboard
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