edit-plugin-form.tsx slugify missing 80-char truncation — update always fails for rules with long descriptions

[abstractonion]

Bug

Clicking "Update Plugin" on a plugin whose rules have long description frontmatter fails with:

Failed to update plugin: new row for relation "plugin_components" violates check constraint "plugin_components_slug_length_check"

Root cause

The slugify function in edit-plugin-form.tsx (and the one in update-plugin.ts) is missing the .slice(0, 80) truncation that exists in both parse.ts and insert.ts:

// edit-plugin-form.tsx — missing truncation
function slugify(value: string) {
  return value
    .toLowerCase()
    .replace(/[^a-z0-9]+/g, "-")
    .replace(/^-+|-+$/g, "");
}

Compare with parse.ts / insert.ts:

const MAX_SLUG_LENGTH = 80;
function slugify(value: string) {
  return value
    .toLowerCase()
    .replace(/[^a-z0-9]+/g, "-")
    .replace(/^-+|-+$/g, "")
    .slice(0, MAX_SLUG_LENGTH)
    .replace(/-+$/g, "");
}

Additionally, the edit form (EditableComponent type) discards the original slug when loading existing components from the database. On submit, it regenerates slugs from comp.name — which for rules is the description frontmatter (a full sentence), not the short filename. This produces slugs well over 80 characters.

Steps to reproduce

1. Publish a plugin with rules that have long description frontmatter (e.g. > 80 chars when slugified)
2. Go to the plugin's edit page
3. Click "Update Plugin" (even without making changes)
4. Observe the plugin_components_slug_length_check constraint violation

Affected plugin

https://cursor.directory/plugins/cadence — 22 of 34 rules produce description-derived slugs over 80 characters. Initial creation works fine (insert path caps at 80); only the update path fails.

Suggested fix

1. edit-plugin-form.tsx: Preserve the original slug from the database in the EditableComponent type, and pass it through on submit instead of regenerating it from name.
2. edit-plugin-form.tsx: Add .slice(0, 80).replace(/-+$/, "") to the client-side slugify as a safety net.
3. update-plugin.ts: Add .slice(0, 80).replace(/-+$/, "") to the server-side slugify as belt-and-suspenders.

Related: migration 20260513_plugin_component_slug_length.sql and commit b99b94e ("chore: trigger rebuild after slug-length data fix") addressed slug length in the insert/parse paths but missed the update path.