fix(site): add explicit whitespace between inline elements

[maehr]

Fixes the missing-whitespace defect reported in #53.

Cause

Astro applies JSX whitespace rules to .astro templates — including the top-level HTML template, not just .map() bodies. A text node's leading/trailing whitespace is deleted when it contains a newline, so a line break between two inline elements yields no whitespace text node. <p>\n a,\n <strong>b</strong> renders as a,b.

CSS masks part of it (.reg-tag { margin-right: .4rem }, flex gap), but the document text stays wrong for copy/paste, assistive technology, text extraction and the Pagefind search index.

Fix

Explicit {' '} separators — already the idiom in this repo (src/components/RegistrySnapshot.astro). No wording, markup or styling changes.

• src/pages/reg/index.astro — the five prose cases from the issue (cited),citation systems, SeeURL layout, for how/id/, and/api/ fit, or thespecification).
• All four record templates (/id/work/, /id/system/, /id/mapping/, /id/ref/) — the .reg-sub header, where the record IRI ran into the JSON link (…aristotle.nicomachean-ethicsJSON) and the type/status chips ran into each other.
• /id/ref/ and /id/mapping/ label↔value pairs (Work:, Citation system:, Subject:, Target:).
• /id/ref/ transcription chips (provider link ↔ edition ↔ access ↔ license), /id/work/ mapping rows (two adjacent anchors).
• Paginated reference lists (/reg/work/…/refs/, /reg/system/…/refs/) — back-link ↔ draft chip.
• AliasList.astro, and the RecordPage.astro site header (TextRefsUnstable preview). Whitespace-only text nodes are ignored in flex layout, so the flex headers are unchanged visually.

Verification

npm run verify:fast green. Built output re-scanned:

$ grep -o 'The TextRefs registry holds.*data model\.' dist/reg/index.html | sed 's/<[^>]*>//g'
The TextRefs registry holds works (texts that get cited), citation systems (rules for …
… See URL layout for how /id/, /reg/, /cite/, and /api/ fit together, or the specification for the data model.

$ grep -rlE '</code><a|</span><a|</a><span|</span><code' dist/id/ dist/reg/
(no matches)

Targets staging, so it rides along in release PR #4.

Closes #53

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