Translate the mail dialog, the Playground web server and the copy-path error - #647

…eaks left in wrapped code (#653)

## Why

#630 is the last batch of #622. #647 did the part that didn't depend on
the other batches. This does the rest, now that #636, #643, #644, #645
and #646 are merged: the en-XA sweep #630 asks for, and the two rule
breaks it named in already-wrapped code.

## What changes

**Found by the sweep:**
- xterm's own screen-reader strings: the terminal input's label
("Terminal input") and its "too much output" announcement, set through
`Terminal.strings` before each terminal is created.
- Main's refusal to submit while a patch is applied. It was `${label} is
applied. Revert it…`, a sentence spliced around the name, and it's shown
as-is in the patch pane. It's now two whole sentences, one with the name
and one without.
- The Playground web server's three errors from main (no folder to
serve, exits before it's ready, times out). #647's review deferred these
here.

**Rule breaks #630 named:**
- `apply-card.cjs` adds a full stop to a headline that lacks one. #630
said to drop it once main's errors carried their own. They don't, and
can't all: `patch-apply.js` messages double as terminal bullets, the
fallback headline is Git's own stderr line, and four paths pass a thrown
error's text. So the full stop stays but goes through `_x('%s.', …)` for
the translator to choose, and a sentence already ended in any script's
mark (`\p{Sentence_Terminal}`) keeps it.
- `workItem.label` is removed from both project types. Nothing read it
once the sentences that named a work item became one per kind.

**Already done, nothing to change:** `use-dev-server.jsx` had nothing
left after #646.

## How to test this

Any platform, current head. The suites cover it:

```bash
# from the repository root
npm test
npm run build:once
npx playwright test --project=journeys tests/e2e/journeys/i18n.spec.js
```

- `ipc-wiring.test.cjs` has two new pseudo-locale tests, for main's
refusal (with and without a name) and the web server's failures. Both
are red on the old `main.js`.
- `apply-card.test.cjs` checks the translated full stop, and that
sentences ended in `。`, `؟` and `।` keep their mark.
- The i18n Terminal journey now finds the input by its translated name.
The apply card journey now expects the whole refusal, full stop
included, as one translated string.

To look by hand: run `npx electron . --lang=en-XA` from the repository
root, open a site, open the Terminal tray, and inspect the terminal's
textarea. Its `aria-label` is bracketed and accented.

**What must not have happened:** with no `--lang`, nothing reads
differently. The refusal, the web server errors and the terminal's label
are the same English as before, and `mail.spec.js`, `terminal.spec.js`
and the rest of the English journeys pass unchanged.

## Risks and limitations

- **What the sweep covered:** I launched en-XA with a Core site and a
Gutenberg site, opened every tray, log tab and settings tab, the site
menu and the create dialog, and scanned the whole window. After the
xterm fix, the only English left was product names, commands, the `$`
prompt and PHP version numbers. It didn't open every dialog or failure
state; the existing i18n journeys cover many of those.
- **Left on purpose** (#622's do-not-wrap list): main's argument guards
(`'Site is not registered'`, `'No running script'`), the `github-prs.js`
and `trac-view.js` errors that are replaced by a status before display,
and `console.error` messages.
- **Untested:** `'Timed out starting web server'` is wrapped but has no
test. It needs fake timers for its 20-second wait.
- #648 (the a11y "Notifications" text) is separate.

## Related

Closes #630. Part of #622.

---

<details>
<summary>Review outcome</summary>

**1 [fix here] · 1 [follow-up]. The fix is applied in c2eb4ba.**

- **Review:** completed by a separate agent with a fresh context,
against `.github/instructions/code-review.instructions.md`. Reviewed
head c53312a, base 8303849 (trunk). `npm run lint` clean, `npm test`
2081/2081, full journey suite 147/147 on c53312a.
- **Fixed:** the list of marks that end a sentence missed Devanagari
`।`, Armenian, Ethiopic, Khmer and Myanmar, so a Hindi sentence would
have got a second mark. It now uses `\p{Sentence_Terminal}`, with a
Hindi case in the test. The doc comment's over-long line was rewrapped.
- **Deferred:** a test for the web server's 20-second timeout (see
Risks).
- **Confirmed by the review:**
- xterm reads `promptLabel` in `open()` and `tooMuchOutput` on each
announcement, so setting both before `new Terminal` is early enough.
- The refusal's English is unchanged for every label, including a blank
one.
  - Nothing reads `workItem.label`.
  - No English journey asserts a changed string.
- **Since review:** c53312a → c2eb4ba, which contains only the fix
above. Lint, unit tests (2081) and the i18n journeys were rerun on
c2eb4ba. One i18n journey (site details and menu, which this branch
doesn't touch) failed once in that run, then passed three times on its
own and in the full run before. That's a flake.

</details>

Nothing on screen changes in English, so there are no screenshots.

🤖 Generated with [Claude Code](https://claude.com/claude-code)