Remove stale link preview from share modal after create

The generated-link "Copy link:" row stayed visible after creating,
looking like the form hadn't reset — but the new link was already in
the Active links list with its own Copy button. Drop the redundant
preview row; on create, reset the form and briefly highlight the new
entry in the active list. Removes the now-dead shareNewLinkRow markup
and copyShareLink().

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

CHANGELOG.md

@@ -9,6 +9,10 @@ Version numbers follow [Semantic Versioning](https://semver.org/spec/v2.0.0.html
 
 ## [Unreleased]
 
+### Changed
+
+- **Share modal no longer leaves a stale link in the create box** — after clicking "Create", the generated-link preview row ("Copy link:") stayed visible at the top of the modal even though the new link was already listed under Active links with its own Copy button — so it looked like the form hadn't cleared. The redundant preview row is removed; creating a link now resets the form and briefly highlights the new entry in the Active links list, where it can be copied. (The 1.7.4 fix cleared the input fields but not this preview row.)
+
 ### Added
 
 - **Reverse-proxy / HTTPS setup guide** — new `docs/setup/ZORAXY_SETUP.md` walks through putting the scanner behind Zoraxy with a Let's Encrypt certificate on a LAN-only deployment: DNS A-record to a private IP, ACME via DNS-01 challenge (HTTP-01 cannot reach a LAN-only host), proxy rule to `127.0.0.1:5100`, binding the app to loopback with `--host 127.0.0.1`, and scanner-specific verification (SSE streaming, HTTPS share links, self-update). Linked from the README (new "HTTPS / reverse proxy" section) and SECURITY.md.