fix(themes): Handle tilde in theme paths

[rrroyal]

Description

When using settings sync between machines with different usernames, custom theme gets reset every time the settings sync. All settings reference mention ~/.warp/themes/my-theme.yaml, so figured it should support it. It didn't, so I (with some help from Copilot) have added it.

Linked Issue

Mainly targeted at my own use case, but probably also #6678.

Screenshots / Videos

Testing

Verified in real-world with ./script/run/cargo run using paths with and without ~.
Tested only on macOS - I don't have access to a Windows or Linux machine as of right now.

Also added tests for themes (theme_test.rs) and warp_core (theme_tests.rs). If they seem redundant, please let me know and I'll remove one of them.

Agent Mode

• Warp Agent Mode - This PR was created via Warp's AI Agent Mode
• Copilot-assisted - This PR was created using Copilot assistance.

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CHANGELOG-IMPROVEMENT: Added support for tilde (~) in custom theme paths.

[oz-for-oss]

@rrroyal

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[oz-for-oss]

Overview

This PR adds tilde expansion and contraction for custom theme paths, including the settings-file path that uses SettingsValue and serde-based paths used for sync/serialization.

Concerns

• None.

Verdict

Found: 0 critical, 0 important, 0 suggestions

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[kevinchevalier]

Thank you for the submission! This works really well.

Can you run cargo fmt to fix the formatting errors and then I will merge it in.

[rrroyal]

Thank you for the submission! This works really well.

Can you run cargo fmt to fix the formatting errors and then I will merge it in.

done @kevinchevalier :)

thanks for the quick review!