Add emoji-picker: emoji & Unicode symbol browser panel

[liamwh]

Plugin

• Id: liamwh/emoji-picker
• New plugin
• Update to an existing plugin (version bumped in plugin.toml)

What it does

A Raycast-inspired emoji and Unicode symbol browser: fuzzy search over
~4,000 entries (CLDR names + keywords, plus curated symbol aliases so
"euro" ranks € above 💶), category browsing, a Frequently Used section
ranked by recency-decayed frequency, and copy-on-Enter. Three panel
entries (wide, desktop, compact) share one script and differ only
in surface size, so a binding can match the display; the grid tier is
derived from the focused output's logical width.

External dependencies

None. The optional paste_command setting (empty by default) runs a
shell command the user configures; the plugin ships no injection
machinery of its own and spawns nothing unless that setting is filled.

Testing

• Self-contained Luau suite (stock luau CLI, no host needed):
  python3 tests/build_test.py --out /tmp/t.luau && luau /tmp/t.luau —
  86 passed, 0 failed (symbol/emoji ranking, literal-character
  queries, browse/keyboard model, Enter-copies-and-closes, dataset
  pre-lowering contract, CPU-budget smoke: 0.43 ms average per search
  against the 25 ms host budget).

• python3 .github/workflows/scripts/validate-plugins.py — clean.

• Daily-driven on the author's machine as the local variant this was
  ported from; the thumbnail is a live screenshot of the panel.

• Tested on Niri

• Tested on Hyprland

• Tested on Sway

• Tested on another compositor:

• Noctalia version tested against: v5.0.0-beta.9

• Plugin API level: 28

Screenshots / Videos

thumbnail.webp (created with the thumbnail generator from a live
screenshot of the panel). Happy to attach a typing-and-selecting video
on request.

Checklist

• The directory name matches the part of id after the / in plugin.toml exactly.
• It ships plugin.toml, README.md, thumbnail.webp, and translations/en.json.
• README.md follows the
  README template, documents
  every entry id and dependency, and includes exact panel IPC commands and launcher prefixes where applicable.
• I created thumbnail.webp with the thumbnail generator.
• version follows semver and is bumped in this PR; plugin_api is the oldest API level this plugin requires.
• Every non-English translation in this PR uses a locale supported by Noctalia core, and I can read, write, and
  understand that language well enough to review and maintain it (no unreviewed machine/LLM translations).
• I did not edit catalog.toml; CI generates it.
• This PR touches exactly one plugin directory.

Code review attestation

• The code is readable and not obfuscated, minified, or generated.
• It does not download and execute remote code.
• Every network call, filesystem write, and spawned process is something the description above accounts for.
• I have the right to publish this code under the license declared in plugin.toml.

---

Notes for reviewers

Dataset provenance (committed data, not generated code):
assets/emoji.json is a data table generated deterministically from
pinned Unicode sources by tools/emoji-list-gen.py (shipped alongside,
docstring documents the exact inputs): CLDR 47 English annotations +
annotationsDerived (names, keywords), Unicode 16.0 emoji-test.txt (RGI
set, ordering, categories), Unicode 16.0 UnicodeData.txt (formal symbol
names). Data sources are Unicode-licensed; generator and plugin code are
MIT. The dataset ships pre-indexed (lowered names/keywords/aliases,
pre-built search blob) so full-dataset per-keystroke search stays inside
the host's CPU budget — the tests assert this.

Behaviour accounting: network — none; filesystem writes — one,
<pluginDataDir>/usage.json (pick counts + timestamps for Frequently
Used; deleting it resets recents); processes — none by default, only the
optional user-configured paste_command.

Works on stock Noctalia: no patched-shell capabilities required or
relied on.

Disclaimer: AI-assisted tooling was used.

[github-actions]

This pull request was automatically closed because its description no longer contains
every part of the pull request template
that this repository requires.

Missing:

• the template marker line <!-- noctalia-pr-template:v1 -->
• the ## Plugin heading
• the ## What it does heading
• the ## External dependencies heading
• the ## Checklist heading
• the ## Code review attestation heading
• the - **Id:** field
• the - **Noctalia version tested against:** field
• the - **Plugin API level:** field
• the checklist entry: Update to an existing plugin (version bumped in plugin.toml)
• the checklist entry: Tested on Niri
• the checklist entry: Tested on Hyprland
• the checklist entry: Tested on Sway
• the checklist entry: Tested on another compositor:
• the checklist entry: The directory name matches the part of id after the / in plugin.toml exactly.
• the checklist entry: It ships plugin.toml, README.md, thumbnail.webp, and translations/en.json.
• the checklist entry: README.md follows the README template, documents every entry id and dependency, and includes exact panel IPC commands and launcher prefixes where applicable.
• the checklist entry: I created thumbnail.webp with the thumbnail generator.
• the checklist entry: version follows semver and is bumped in this PR; plugin_api is the oldest API level this plugin requires.
• the checklist entry: Every non-English translation in this PR uses a locale supported by Noctalia core, and I can read, write, and understand that language well enough to review and maintain it (no unreviewed machine/LLM translations).
• the checklist entry: I did not edit catalog.toml; CI generates it.
• the checklist entry: This PR touches exactly one plugin directory.
• the checklist entry: The code is readable and not obfuscated, minified, or generated.
• the checklist entry: It does not download and execute remote code.
• the checklist entry: Every network call, filesystem write, and spawned process is something the description above accounts for.
• the checklist entry: I have the right to publish this code under the license declared in plugin.toml.
• at least one checked compositor testing entry

Please add the items listed above back to the description, keeping their exact wording, then
reopen the pull request. Reopening re-runs this check. Draft pull requests may leave boxes
unchecked. Before a pull request is ready for review, exactly one plugin type, at least one
tested compositor, and every item under Checklist and Code review attestation must be checked.

[liamwh]

Superseded by #502 (same branch; re-opened as a fresh PR with the required template after the initial description was missing required sections). The thumbnail was also regenerated with the official generator in 7043992.