chore: add changeset for 0.1.1 (SSR fix + README refresh) (#18)

* chore: add changeset for 0.1.1 (SSR fix + README refresh)

Queues the next version bump. Once this lands on main, the changesets
GitHub Action will open a "chore: version packages" PR that bumps
@kripa006/404-ui 0.1.0 -> 0.1.1 and updates the changelog. Merging
that auto-PR triggers Release on push, which runs `changeset publish`
and uploads 0.1.1 to npm.

The headline change is the SSR fix from PR #10 — vanilla entries no
longer throw `HTMLElement is not defined` under Node. The README
refresh ensures npmjs.com displays the up-to-date gallery + snippets
on the 0.1.1 version page (the 0.1.0 publish stored `readme: null`
so npmjs is currently falling back to a much older 0.0.0 readme).

Per the original ship plan, this is a patch bump (bug fix + docs).
The framework example apps that were originally bundled with PR #4
were deferred to a follow-up, so no minor bump is warranted yet.

* ci: ensure local base branch exists before running changeset status

PR Validation's `release-check` job was failing on the first PR that
actually contains a changeset (#18) with:

  🦋 Error: Failed to find where HEAD diverged from "main".
  Does "main" exist and it's synced with remote?

Root cause: actions/checkout@v4 with `fetch-depth: 0` fetches every
commit but only sets up a remote-tracking ref (`origin/main`). The
local `main` branch never gets created. `pnpm changeset status` reads
`baseBranch: "main"` from `.changeset/config.json` and runs
`git merge-base HEAD main`, which fails because `main` doesn't exist
locally.

Adding a small step that creates the local base ref from the remote-
tracking one before any changeset commands run. Uses
`${{ github.base_ref }}` so it works on any base branch (not just
main).

Also de-duplicates the `git fetch` previously inlined in the
"Check for changeset files" step — the new step covers it.

Latent for previous PRs because none had a changeset to validate.
PR #18 is the first to surface it; this fix unblocks the entire
release flow.

Author: kripa-sindhu-007

.changeset/ssr-safe-vanilla-and-readme-refresh.md

@@ -0,0 +1,21 @@
+---
+"@kripa006/404-ui": patch
+---
+
+Make the vanilla entry SSR-safe and refresh the package README.
+
+**SSR fix.** Each vanilla theme used to declare `export class
+<Theme>404Element extends HTMLElement` at module top, which threw
+`HTMLElement is not defined` the moment the package was imported
+under Node — Next.js SSR, Nuxt SSG, Astro build, Remix server. The
+class now extends a `SafeHTMLElement` reference that resolves to the
+real `HTMLElement` in browsers and to a dummy class in Node. The class
+is still only ever instantiated by `customElements.define` inside the
+existing `typeof window !== "undefined"` guard, so behavior in the
+browser is unchanged.
+
+**README refresh.** The npm-rendered README now shows the live
+4-template gallery (Space, Glitch, Ocean, Forest), per-framework
+code snippets, and the bundle-size badge. The previous publish
+stored an empty README in the version metadata; this version sets
+it correctly.

.github/workflows/pr-validation.yml

@@ -181,12 +181,25 @@ jobs:
       - name: Install dependencies
         run: pnpm install --frozen-lockfile
 
+      # `pnpm changeset status` (run further down) compares HEAD against
+      # the local branch named in `.changeset/config.json` (`baseBranch:
+      # "main"`). actions/checkout@v4 with fetch-depth: 0 fetches all
+      # commits but only sets up a remote-tracking ref `origin/main` —
+      # the local `main` branch doesn't exist, so changeset's
+      # `getDivergedCommit` aborts with "Failed to find where HEAD
+      # diverged from main". Create the local `main` ref so the status
+      # command can find its base.
+      - name: Ensure base branch is available locally
+        run: |
+          git fetch origin ${{ github.base_ref }}:${{ github.base_ref }} || true
+          git branch --list ${{ github.base_ref }} || \
+            git branch ${{ github.base_ref }} origin/${{ github.base_ref }}
+
       - name: Check for changeset files
         id: check-changeset
         run: |
-          # Check if any changeset files were added or modified in this PR
-          # Compare against the base branch to find changed files
-          git fetch origin ${{ github.base_ref }}
+          # Check if any changeset files were added or modified in this PR.
+          # Compare against the base branch to find changed files.
           CHANGED_FILES=$(git diff --name-only origin/${{ github.base_ref }}...HEAD)
           
           # Check if any .md files in .changeset directory (excluding README.md specifically)