Add support for rendering media captions in the timeline.

[pixlwave]

Should bring EXI into parity with EXA regarding captions. Part of https://github.com/element-hq/element-internal/issues/637 which I now remember needs to be broken down into tasks still.

Caption!

[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 9e2586d

[sonarcloud]

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 SonarCloud

[codecov]

❌ 3 Tests Failed:

Tests completed	Failed	Passed	Skipped
846	3	843	0

View the top 1 failed tests by shortest run time

PreviewTests test_roomDetailsEditScreen()

Stack Traces | 2.23s run time

failed - Snapshot "Editable" does not match reference.

@−
"file:.../__Snapshots__/PreviewTests/test_roomDetailsEditScreen-iPhone-16-en-GB.Editable.png"
@+
"file:.../tmp/PreviewTests/test_roomDetailsEditScreen-iPhone-16-en-GB.Editable.png"

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

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

The percentage of pixels that match 0.8510742 is less than required 1.0
The lowest perceptual color precision 0.016250014 is less than required 0.98 (.../PreviewTests/Sources/PreviewTests.swift:84)

View the full list of 2 ❄️ flaky tests

PreviewTests test_identityConfirmationScreen()

Flake rate in main: 21.19% (Passed 212 times, Failed 57 times)

Stack Traces | 1.44s run time

failed - Snapshot does not match reference.

@−
"file:.../__Snapshots__/PreviewTests/test_identityConfirmationScreen-iPhone-16-en-GB.1.png"
@+
"file:.../tmp/PreviewTests/test_identityConfirmationScreen-iPhone-16-en-GB.1.png"

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

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

The percentage of pixels that match 0.89941406 is less than required 1.0
The lowest perceptual color precision 0.39937502 is less than required 0.98 (.../PreviewTests/Sources/PreviewTests.swift:84)

PreviewTests test_userProfileScreen()

Flake rate in main: 14.29% (Passed 66 times, Failed 11 times)

Stack Traces | 6s run time

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

@−
"file:.../__Snapshots__/PreviewTests/test_userProfileScreen-iPhone-16-en-GB.Other-User.png"
@+
"file:.../tmp/PreviewTests/test_userProfileScreen-iPhone-16-en-GB.Other-User.png"

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

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

The percentage of pixels that match 0.9088135 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 individual test run time comparison to the main branch, go to the Test Analytics Dashboard