Preview a sender's email in The Screener with space

[dhh]

A row in The Screener only has room for the subject and the first line of what the sender wrote, which often isn't enough to decide. Space now opens a bigger preview.

• The preview: it shows the sender's most recent email in full, rendered the way a thread renders a body: name and address, date and subject at the top, the Markdown body below in a scrolling viewport. It covers the queue while it's open.
• Keys: arrow keys, j/k and PgUp/PgDn scroll it. y/i and n answer for the sender being previewed and close it. Space, Escape and q close it and leave you in The Screener. The help bar changes to match, and the queue's help bar offers "space preview".
• Reading: one Messages().Get of the clearance's most_recent_entry (the row now keeps entryID). It only reads, so it doesn't screen the sender or tell them anything. I checked against a live account: a still-unscreened sender's email reads in full, and the Screener still held the same four senders afterwards.
• Edge cases:
  • A slow answer for a preview the reader already closed is dropped, using a request id as the other lanes do.
  • A sender HEY served no entry for gets a notice instead of an empty preview.
  • Screener History has decisions, not emails, so space does nothing there.
  • The body is rendered again when the width or the theme changes.
  • The header is cut to the screen width before it's styled, keeping room for the date, so a long name or address can't wrap and push the footer off screen. Found in review.
• Refactor: screen now calls a new screenRow, so an answer from the preview goes to the previewed sender, not to whoever a live re-read has since put under the cursor.

docs/tui.md describes it. New tests cover opening, the three ways to close, answering from the preview, a late answer after closing, a sender with nothing to preview, the history tab, and scrolling with the header in place.

🤖 Generated with Claude Code

[Copilot]

Copilot review overview

🟡 Changes recommended

Theme refresh and narrow-header layout defects can leave the preview incorrectly rendered.

Review effort: Balanced
Findings: 2 · 1

Open (3)

• Restyle Screener preview when the theme changes · New
• Reserve trailing field width before truncating the header name · New
• Document q as the preview close shortcut · New

What changed in this PR

Adds full-message previews to The Screener so users can review an email before screening its sender.

Changes:

• Adds preview loading, rendering, scrolling, closing, and screening controls.
• Preserves sender identity during live queue refreshes.
• Adds tests and TUI documentation.

[!TIP]
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File	Description
internal/​tui/​screener.go	Integrates preview state and controls.
internal/​tui/​screener_preview.go	Implements preview loading and rendering.
internal/​tui/​screener_test.go	Adds preview API fixture.
internal/​tui/​screener_preview_test.go	Tests preview behavior and edge cases.
docs/​tui.md	Documents preview controls.

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