Add application-only website parsing and prefilled failure issues

[maebli]

Application-only payloads such as 78 03 13 15 31 00 and bare DIF/VIF records such as 03 13 15 31 00 now parse on the website after wired and wireless frame detection fails. The fallback supports all website output formats, labels application-only results, and rejects malformed or incomplete records. Existing full-frame APIs keep their strict behavior.

Parse failures and partial frame results show an Open GitHub issue link prefilled with the captured payload, error codes/messages, parse attempts, parser version, output format, browser, and reproduction URL. AES keys are omitted. The toolbar report action uses the captured failure even if the input is edited afterward; successful retries clear stale reports.

Validation:

• Workspace tests with decryption enabled passed.
• Application/output contract tests, formatting, and Clippy passed.
• Release WASM build and actual WASM/inline website-helper integration passed for all seven website formats.
• Chromium checks verified URL auto-parsing, application-only JSON, bare-record hex view, and the prefilled issue link.
• Added WASM browser regression tests. Local headless Firefox could not start because its installation encountered permission errors; these tests run in the existing Firefox CI job.

Pages continues to rebuild the WASM assets during deployment.