feat(page): ship DocsUI::Table + DocsUI::PropTable — stop hand-rolling tables

[mhenrixon]

Closes #11 (Part of #8, Phase 1).

Problem

Reference tables were the most duplicated markup in the ecosystem: the gem's own docs carried a page-local PropTable explicitly marked "Not part of the DocsUI kit", and every consuming site hand-rolled its own table/tr/td blocks. None could get an options/params/errors table from the gem.

What changed

Upstreams the dogfooded design into the kit, generalized:

• DocsUI::Table.new(headers, rows) — generic headers + rows in the kit's daisyUI look (table table-sm table-zebra inside a rounded-box border, not-prose). Cell values follow the proven convention:
  • String → plain, Phlex-escaped text
  • [:code, "x"] → inline <code>
  • [:md, "…"] → inline GFM through DocsUI::Markdown (opt-in, so a plain string that merely looks like markdown is never surprise-parsed)
• DocsUI::PropTable.new(rows, headers:) — a thin preset built ON Table (composition, no markup duplication): first column auto code-styled, Option/Type/Default/Description headers by default, overridable via headers:.
• DocsUI::Markdown.inline — a no-wrapper, no-<p> render used by [:md, …] cells. Adjacent top-level paragraphs are space-joined so unwrapping never fuses text.

Both are kit-form-callable (DocsUI::Table(...) / DocsUI::PropTable(...)) automatically via include DocsUI.

Delta for a consuming site

New components, fully backwards compatible — nothing existing changes. A site can now render an args/options table from the gem instead of hand-writing daisyUI table markup.

Cleanup in this repo

• Deletes the page-local Views::Docs::Pages::PropTable.
• Swaps all 18 PropTable.new call sites across 7 docs pages to DocsUI::PropTable (the constructor flips from (headers, rows) to (rows, headers:); the default headers are dropped where they were the default).
• Documents Table + PropTable on the components reference page (with a live demo of all three cell types) and in the README component table.

Test plan

Spec	Covers
spec/docs_ui/table_spec.rb	headers→th, rows→td, [:code]→<code>, [:md]→inline markdown, empty rows → headers only, HTML in a string cell / header escaped
spec/docs_ui/prop_table_spec.rb	first column code-styled, default + custom headers, [:code]/[:md] honored in other columns, reuses Table's wrapper
spec/docs_ui/markdown_spec.rb	.inline: no <p>/Prose wrapper, soft break → one space, multiple paragraphs separated (regression against a "onepara" fusion bug caught in adversarial review)

Verification

• bundle exec rspec — 121 examples, 0 failures
• bundle exec rubocop — 48 files, no offenses
• cd docs && bun run build:css — clean; table-zebra/rounded-box/not-prose present in the built CSS
• Rendered /docs/configuration + all 7 swapped pages via a real HTTP request — HTTP 200, tables identical to before the swap
• No page-local PropTable references remain

Out of scope (per the issue)

• FieldTable/ErrorTable API presets (Phase 2 — they build on this).
• Sortable/filterable tables (would violate the one-controller rule).
• Fixing consumer repos' hand-rolled tables (follow-up once this ships).