Open Contacts with o, and attachments with Enter

[robzolkos]

The Contacts tab underlines the o in its name, but the key that opened it was Shift+O, so pressing the letter the tab points at did nothing. Mail, Calendar and Journal underline a capital, so their hints were already right. The C that starts "Contacts" belongs to Calendar, which leaves o.

• o now opens Contacts from anywhere, including inside a thread. Shift+O still works, the way HEY's letter shortcuts answer either case. HEY's web app has no Contacts shortcut to match, and its o (Power Through) has no counterpart in the TUI.
• o used to open the selected attachment in a thread; that moves to Enter. With a link selected (Tab), Enter opens the link as before; otherwise it opens the selected attachment. Escape clears the link.
• The help bar offers enter open attachment only while no link is selected, since the link footer already says what Enter does, and the section row now reads shift+M/C/J jump · o contacts.
• docs/tui.md covers both.

Before

In a thread, Enter does nothing and o opens the attachment; Contacts needs Shift+O.

After

Enter opens the attachment, then o goes to Contacts.

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Summary by cubic

The Contacts tab underlines o, but the shortcut that opened it was Shift+O — so the letter the tab points at did nothing. o now opens Contacts from anywhere, including inside a thread; Shift+O still works, and the attachment shortcut in a thread moves from o to Enter.

• With a link selected (Tab), Enter opens the link as before; otherwise it opens the selected attachment, and Escape clears the link.
• The help bar offers enter open attachment only while no link is selected, since the link footer already says what Enter does.
• docs/tui.md reflects both shortcuts.

^{Written for commit 4f7b6b7. Summary will update on new commits.}

[Copilot]

Copilot review overview

🟢 Approved

The shortcut routing, contextual help, documentation, and automated coverage are consistent and complete.

Review effort: Balanced
Findings: None

What changed in this PR

Updates TUI navigation so o opens Contacts and Enter opens attachments unless a link is selected.

Changes:

• Adds lowercase o as the Contacts shortcut while retaining Shift+O.
• Moves attachment opening from o to Enter with link-selection precedence.
• Updates help text, documentation, and tests.

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File	Description
internal/​tui/​tui.go	Updates global shortcut help.
internal/​tui/​tui_test.go	Tests Contacts and Enter routing.
internal/​tui/​nav.go	Maps o/O to Contacts.
internal/​tui/​mail.go	Routes Enter to links or attachments.
internal/​tui/​mail_test.go	Updates attachment-opening tests.
docs/​tui.md	Documents revised shortcuts.

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