## Summary
Minimal fix for #1281 — two surgical changes to the packet detail pane:
1. **Hide the `Location` row when transmitter GPS is unavailable.**
Only ADVERT packets carry unencrypted GPS in their payload, so ~90% of
packet types (TXT_MSG, GRP_TXT, ACK, REQ, MULTIPART, …) were rendering
`<dt>Location</dt><dd>—</dd>` for nothing. We now skip the `<dt>/<dd>`
pair entirely when `locationHtml` is empty. ADVERT rendering is
unchanged.
2. **Fix the `📍map` link contrast in dark mode.**
The trailing link had only `style="font-size:0.85em"` and inherited the
UA-default `<a>` blue (`rgb(0,0,238)`) → unreadable against
`--card-bg` in dark theme. Replaced inline style with
`class="loc-map-link"` and added a small CSS rule that pulls color
from `var(--accent)`.
### Out of scope (per operator direction)
The original issue also proposed adding an `Rx:` observer-GPS line and
distance-from-observer. **Not in this PR** — operator decided the
existing observer IATA pill already conveys that, so adding more rows
here is unnecessary. Bullets 1–2 of the issue's "Acceptance" list are
covered; the multi-line `Tx:`/`Rx:` reformat is intentionally not done.
## TDD
- **Red** `d465cf84` — `test-issue-1281-location-row-e2e.js` asserting:
- Non-ADVERT detail must NOT contain `<dt>Location</dt>`
- ADVERT detail STILL contains `<dt>Location</dt>` with GPS coords
- `.loc-map-link` computed `color` equals `var(--accent)` (not UA blue)
Verified to fail on master (`1 passed, 2 failed`) — see commit body.
- **Green** `8c9bd8cb` — implementation. All three assertions pass.
- **CI wiring** `9571b4f4` — added the test to `deploy.yml`'s E2E block.
## Files changed
- `public/packets.js` — empty-string default for `locationHtml`,
conditional `<dt>/<dd>` render, three sites swap inline style → class.
- `public/style.css` — new `.loc-map-link { color: var(--accent); … }`
rule next to `.detail-meta dd`.
- `test-issue-1281-location-row-e2e.js` — new Playwright E2E.
- `.github/workflows/deploy.yml` — one-line CI hook.
## Acceptance verification (against fixture DB)
```
=== #1281 Location row + map link contrast E2E against http://localhost:13581 ===
✓ Non-ADVERT packet detail does NOT render <dt>Location</dt>
✓ ADVERT packet detail STILL renders <dt>Location</dt> with GPS coords
link.color=rgb(74, 158, 255) --accent→rgb(74, 158, 255)
✓ 📍map link uses class="loc-map-link" with color = var(--accent)
3 passed, 0 failed
```
Fixes#1281
---------
Co-authored-by: bot <bot@local>
Kpa-clawbot