descrybe/docs/regression-categories-vs-campaigns.md

Regression: /categories must not render campaign edit

Symptom (fixed)

Nav/URL on Categories (/categories) sometimes showed Edit campaign chrome with a blank body.

Cause notes

• Route files are distinct: routes/categories/+page.svelte vs routes/campaigns/[id]/+page.svelte.
• SvelteKit dictionary maps /categories → categories page and /campaigns/[id] → campaign edit.
• Campaign edit previously rendered PageShell titled "Edit campaign" even when page.params.id was empty (blank body) — that shell must never linger across client navigations.

Guards added

1. Root dashboard layout keys page content by page.url.pathname so prior route shells unmount on nav.
2. Campaign edit redirects to /campaigns when id is missing; wizard is keyed by campaignId.

Quick check

1. Open /campaigns/<any-id> (or list), then click Categories in the nav.
2. Assert H1 is Categories and body shows the category tree (not "Edit campaign").
3. Hard-load /categories — same result.