Plugin: properties UI + Bases-style vault tables (#72)

[thetechjon]

Summary

Closes #72 by building a noteser-properties reference plugin under
public/plugins/. Two surfaces, both via the Plugin API v1.2 stack
that landed across PRs A–F + the post-v1.2 VNode event delivery
follow-up (#142):

• Sidebar Properties+ panel — renders the active note's
  frontmatter as a key/value list. One input VNode per property;
  "+ Add property" opens a key + value draft row. Every commit
  calls ctx.vault.write.updateNote(id, { frontmatter }) so the
  host's existing writeFrontmatter helper re-serialises the block
  and the note body stays untouched. Subscribes to
  ctx.vault.events.onActiveNoteChange + onNoteSaved so the
  panel re-pulls the host-parsed frontmatter on every relevant
  change.
• Fullscreen Vault tables view — Obsidian Bases-style table
  over the whole vault. ctx.vault.read.getAllNotes() (falls back
  to ctx.vault.read.stream() when the vault is too large for the
  single-envelope path), columns inferred as the union of every
  note's frontmatter keys. Filter input matches across title,
  folder path, every stringified value. Column headers are button
  VNodes — click to sort, click again to flip direction. Each row
  renders the title as a link VNode so the PR Wire VNode event delivery + wikilink intercept (post-v1.2 followup) #142 wikilink
  intercept opens the note. "Save current view as note" calls
  ctx.vault.write.createNote with the rendered markdown table.

Coexists with the existing core PropertiesPanel — both stay
selectable per Jon's rule.

Why a plugin (not core)

The plugin platform was specifically scoped to unlock these four
issues (#70, #71, #72, #73) as plugins rather than core code; the
v1.2 plan doc calls #72 out by name in §13. Shipping as a plugin
keeps:

• Bases parity on the surface that Obsidian users already know
• The vault.write audit trail engaged for every property edit
• The pluggable boundary clean — future schemas (Templater, Tasks
  cross-references) can replace this without touching core

Frontmatter inference notes

• Source: NoteWithBody.frontmatter from the host. The plugin
  never re-parses YAML; js-yaml is intentionally NOT a
  dependency (the plan's "already a dep — check package.json"
  hint checked — it isn't; the host's lightweight parser already
  hands us a typed object).
• Per-column type: string / number / date (ISO date pattern)
  / tag-array / boolean. Heterogeneous columns reduce to
  string so sort stays sane on a mixed vault.
• Numeric-shaped strings (e.g. frontmatter priority: 3 written
  bare) classify as number so a "priority" column sorts
  numerically even though the underlying values arrive as JS
  strings from some other plugin's writes.
• Columns whose every value was empty are dropped — they would
  otherwise add noise to vaults with one-off bare key: lines.
• tags always renders first; remaining columns alphabetical.

Filter / sort UX

• Filter is a single search input. Case-insensitive substring
  match across title, folder path, and every stringified
  frontmatter value (arrays joined with , , objects JSON-ified).
  Empty / whitespace filter keeps every note.
• Click a header to sort by that column. Clicking the same header
  again flips ascending↔descending; clicking a different header
  resets to ascending. The active sort is shown in the header
  label with a ▲/▼ glyph.
• Empties (null / undefined / empty string / missing key) always
  sort last in ascending direction, reversed by desc.
• Title and folder-path get their own special sort keys (_title,
  _folder) so they remain sortable even on vaults whose
  frontmatter never declares those keys.

Test plan

• npm run lint clean
• npx tsc --noEmit zero errors
• npm test -- --ci green (2608 passing, 17 pre-existing
  skips — the new suite adds 44 tests covering inference,
  filter, sort, value coercion, and markdown export)
• Manual smoke: install plugin via Settings → Plugins, open a
  note with frontmatter, confirm Properties+ panel renders +
  lets you edit. Run "Open Vault tables" from the palette,
  confirm table appears, sort by a column, click a row to
  open that note.

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