fix(build): Bundle the plugin with tsdown to load ESM vim engine

[craftzdog]

Problem

The plugin fails to activate on Inkdrop 6:

SyntaxError: Failed to construct 'ContextifyScript': Unexpected token 'export'
  at .../@replit/codemirror-vim-core/vim.js:41
  at Object.<anonymous> (.../@replit/codemirror-vim/dist/index.cjs:3:25)
  at Object.<anonymous> (.../packages/vim/src/vim.js:1:177)

@replit/codemirror-vim@6.4.0 split its engine into @replit/codemirror-vim-core@0.1.0, which is ESM-only ("type": "module", a single export function initVim(CM)). Its own dist/index.cjs therefore require()s an ESM file. Inkdrop loads plugins through CommonJS require(), so activation throws before the plugin ever runs.

Fix

Bundle src/ into one CJS file with tsdown, the same approach the mermaid and embed plugins use.

• inkdrop and @codemirror/* stay external — those must resolve to the host's instances (via Inkdrop's exports/@codemirror/*.js shims) or the plugin's extensions would run against a duplicate @codemirror/state and be rejected by the editor.
• Everything else, including both @replit packages, is bundled in. @replit/codemirror-vim moves to devDependencies; the plugin now has no runtime dependencies.
• main → ./lib/index, lib/ gitignored, prepublishOnly: npm run build.

Also in this PR

• TypeScript — all 8 sources converted; src/vim.js → src/index.ts with export default new VimPlugin() (tsdown's cjsDefault emits module.exports = …, so the loader contract is unchanged). Adds @inkdropapp/types, typescript@^7.0.2 (matching desktop-v6), and @codemirror/state/view as devDeps for typechecking.
• oxlint / oxfmt replace eslint / prettier, matching the sibling plugins.
• Three dead bits the type checker surfaced: an unused actions import in the entry, two leftover console.log calls in the preview scroll handlers, and a vim.visualBlock argument that was always undefined (vim is the extension factory, not vim state).

Size

lib/index.js is 127 KB minified / 40 KB gzipped. Sourcemap attribution:

	bytes	share
@replit/codemirror-vim-core (vim engine)	92 KB	74.3%
@replit/codemirror-vim (CM6 adapter)	27 KB	21.5%
plugin src/	5 KB	4.2%

This is smaller than before: the installed plugin used to carry 740 KB of node_modules, of which 324 KB of unminified JS was parsed on every load. Treeshaking can't reduce it further — the engine is one 7,164-line function behind a single export.

Test plan

• pnpm typecheck — clean
• pnpm lint — 0 warnings, 0 errors over 8 files
• pnpm build — emits only the five @codemirror/* requires as externals
• Plain node require() of lib/index.js returns the plugin instance with activate and both config keys — the SyntaxError is gone
• Load in Inkdrop 6 and exercise: normal/insert/visual mode classes, :w / :n / :prev / :preview, <C-n>/<C-p> completion nav, yank/paste against the system clipboard across note switches, relative line numbers toggle, preview-pane scroll commands