feat(tui): expose slash commands as hotbar actions

[reidliu41]

Summary

Refs #2067
Part of #2061

This adds the slash-command source adapter for the Hotbar.

The Hotbar can now bind existing slash commands as slash.<name> actions, for example:

• slash.mode
• slash.task
• slash.rename

Arg-less and optional-arg commands run through the same slash-command dispatch path as typing the command manually.
Commands with required arguments do not run incomplete; they prefill the composer with the command and a trailing space so
the user can finish the input.

Also updates config.example.toml with a slash.mode binding example.

Testing

• cargo fmt --all -- --check
• cargo clippy --workspace --all-targets --all-features
• cargo test --workspace --all-features

Checklist

• Updated docs or comments as needed
• Added or updated tests where relevant
• Verified TUI behavior manually if UI changes
• Harvested/co-authored credit uses a GitHub numeric noreply address

[greptile-apps]

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[gemini-code-assist]

Code Review

This pull request introduces the ability to bind slash commands to hotbar slots (e.g., slash.<name>). It adds a helper method to determine if a command requires arguments, registers slash commands as hotbar actions, and implements the dispatch logic. If a slash command requires arguments, it pre-fills the composer; otherwise, it executes the command immediately. Documentation and unit tests are also added to support this feature. I have no feedback to provide as there are no review comments.

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[Hmbown]

The action surface is sane — approving.

What I verified:

• ** bracket-depth parser** is the right call and improves on the existing naive requires_argument() (which just checks contains('<')). It correctly handles the nested usage strings: /queue [list|send <n>|...] → false (the <n> is inside [], so the whole arg is optional), /agent [N] <task> → true (<task> at depth 0), /mode [agent|plan|...] → false. This is the genuinely clever piece and it's correct.
• API surface matches the branch: commands::command_infos() returns Vec<&'static CommandInfo> so the &'static CommandInfo field is sound; commands::execute, clear_input_recoverable, CommandResult { action: Option<AppAction> } all exist as used.
• No id-namespace collision — the slash. prefix is unused in the existing hotbar registry.
• is_active() = false is correct for slash actions: they have no toggle/highlight state (unlike mode.agent), so the button correctly never highlights as active.
• Required-arg prefill path (/rename) clears the draft recoverably and seeds /rename in the composer — the test covers the undo buffer and status message. Argless/optional-arg commands dispatch through the same commands::execute path as typing them manually.

Full CI matrix green (ubuntu/macos/windows + lint + mobile smoke). reidliu41 is in AUTHOR_MAP. The unchecked --workspace box in the PR body is moot — the CI matrix already runs the workspace suite. Merging.

[Hmbown]

The action surface is sane — approving.

What I verified:

• requires_required_argument() bracket-depth parser is the right call and improves on the existing naive requires_argument() (which just checks contains('<')). It correctly handles the nested usage strings: /queue [list|send <n>|...] → false (the <n> is inside [], so the whole arg is optional), /agent [N] <task> → true (<task> at depth 0), /mode [agent|plan|...] → false. This is the genuinely clever piece and it's correct.
• API surface matches the branch: commands::command_infos() returns Vec<&'static CommandInfo> so the &'static CommandInfo field is sound; commands::execute, clear_input_recoverable, CommandResult { action: Option<AppAction> } all exist as used.
• No id-namespace collision — the slash. prefix is unused in the existing hotbar registry.
• is_active() = false is correct for slash actions: they have no toggle/highlight state (unlike mode.agent), so the button correctly never highlights as active.
• Required-arg prefill path (/rename) clears the draft recoverably and seeds /rename in the composer — the test covers the undo buffer and status message. Argless/optional-arg commands dispatch through the same commands::execute path as typing them manually.

Full CI matrix green (ubuntu/macos/windows + lint + mobile smoke). reidliu41 is in AUTHOR_MAP. The unchecked --workspace box in the PR body is moot — the CI matrix already runs the workspace suite. Merging.