feat(keybindings): allow configured double-prefix actions

[drakejwong]

Summary

• allow an explicit user keybinding whose prefix-mode key equals keys.prefix
• dispatch configured prefix actions before falling back to literal double-prefix passthrough
• preserve Escape precedence and the existing passthrough behavior when no override is configured

This enables configurations such as:

[keys]
prefix = "ctrl+s"
zoom = "prefix+ctrl+s"

Tests

• cargo fmt --check
• cargo test --bin herdr double_prefix
• cargo test --bin herdr escape_precedes_configured_prefix_action
• cargo test --bin herdr config::keybinds::tests
• cargo test --bin herdr app::input::navigate::tests

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[kangal-bot]

Hi @drakejwong, thanks for your interest in contributing.

Herdr does not accept unsolicited implementation pull requests from contributors who are not listed in .github/APPROVED_CONTRIBUTORS.

The pull request author is not an approved contributor.

If you encountered a reproducible bug, report the observed behavior through the bug issue template. A report does not reserve the work or authorize a pull request; accepted fixes are normally implemented by Herdr’s maintainer-controlled agents.

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