The app's terminal prints production's address and the newest open preview, gated like the pill #6461

The Deploys screen now shows "Newest preview: #N <title> <url>" on production, and it's pushed. The preview-side "Production: <url>" line isn't reachable from any screen yet. tsc, tui-deploys and the three existing pill-side test files pass, and the design lint is clean. I did not run the whole check.

• Shared gate: I pulled the pill's gate and reading out of sideFor in src/apps/proxy.ts into an exported sideForViewer, so the pill and the terminal use the same code. It returns nothing for a guest, an inactive user, or someone who can't read the repo. The newest preview comes from openPulls, so only pulls the viewer may read are named.
• New helpers: sideLine in src/apps/side.ts formats the line as plain text with control characters stripped. appSideLine in src/actions/apps.ts returns it, or an empty string when there is nothing to show.
• Screen: src/tui/screens/deploys.ts draws that line in the header block, next to the visitors, trend and pace lines.
• Tests: test/tui-deploys.test.ts gets one new test. It stubs a running pull-7 and checks four things:

- A reader sees Newest preview: #7 Dim the beacon https://beacon--7.apps.test on the screen. - A guest gets nothing. - A preview environment gives Production: https://beacon.apps.test to a reader. - A preview environment gives nothing to a guest.

I did not test the guest through the rendered screen. The guest case is covered at the appSideLine level, and the screen only draws what that function returns.

I left out any banner inside the app's own pty (runAppTty). That terminal belongs to the app's program, and writing into it would corrupt its output. Because the Deploys screen only ever shows production, the "Production:" line has no screen to appear on yet. It is implemented in appSideLine(..., env) and tested, but not shown anywhere.

To try it, open an app's Deploys screen over ssh while one of its pulls has a running or asleep preview.

Closes #6047

The Deploys screen now shows "Newest preview: #N <title> <url>" on production, and it's pushed. The preview-side "Production: <url>" line isn't reachable from any screen yet. tsc, tui-deploys and the three existing pill-side test files pass, and the design lint is clean. I did not run the whole check.

• Shared gate: I pulled the pill's gate and reading out of sideFor in src/apps/proxy.ts into an exported sideForViewer, so the pill and the terminal use the same code. It returns nothing for a guest, an inactive user, or someone who can't read the repo. The newest preview comes from openPulls, so only pulls the viewer may read are named.
• New helpers: sideLine in src/apps/side.ts formats the line as plain text with control characters stripped. appSideLine in src/actions/apps.ts returns it, or an empty string when there is nothing to show.
• Screen: src/tui/screens/deploys.ts draws that line in the header block, next to the visitors, trend and pace lines.
• Tests: test/tui-deploys.test.ts gets one new test. It stubs a running pull-7 and checks four things:

- A reader sees Newest preview: #7 Dim the beacon https://beacon--7.apps.test on the screen. - A guest gets nothing. - A preview environment gives Production: https://beacon.apps.test to a reader. - A preview environment gives nothing to a guest.

I did not test the guest through the rendered screen. The guest case is covered at the appSideLine level, and the screen only draws what that function returns.

I left out any banner inside the app's own pty (runAppTty). That terminal belongs to the app's program, and writing into it would corrupt its output. Because the Deploys screen only ever shows production, the "Production:" line has no screen to appear on yet. It is implemented in appSideLine(..., env) and tested, but not shown anywhere.

To try it, open an app's Deploys screen over ssh while one of its pulls has a running or asleep preview.

The Deploys screen now prints production's address as well as the newest preview. I have pushed this to the same branch. I ran tsc and 123 tests across the 11 test files that mention the pill's side. These include the proxy/credentials, toolbar and pill-side tests, which cover the sideFor refactor. I did not run the whole check.

• Production line: a signed-in reader sees Production: <url>, then Newest preview: #N <title> <url> when a pull's preview is up or asleep. A guest, an inactive user, or someone who can't read the repo sees neither. The new appSideLines in src/actions/apps.ts builds both lines, so the screen is a real caller of the production line.
• Dead branch removed: I dropped the env parameter and the Production: branch of sideLine; side.ts now only has a small plainLine helper that strips control characters.
• Shared gate: the pill's active-reader check moved into an exported sideReader in src/apps/proxy.ts. sideForViewer, the pill and the terminal all use it, so there is one gate.
• Guest test: test/tui-deploys.test.ts now renders the screen for a guest and asserts that neither line appears. The screenText helper takes null for a guest, because passing undefined silently fell back to the default user.
• Docs: I added the lines to the Deploys-screen paragraph in docs/APPS.md. The root README.md doesn't mention the Deploys screen at all, so I put it where the screen is already documented rather than adding a new section.

To try it, open an app's Deploys screen (d on the repository) while one of its pulls has a running or asleep preview.