Merge branch 'worktree-agent-a63474e92b05425a5'

# Conflicts:
#	Cargo.lock
#	Cargo.toml

tickets/010-css-management.md

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+# 010 — CSS import/management
+
+## Summary
+
+Let users import custom CSS (stored alongside settings/profiles, deletable) or link
+to an external CSS path/URL (not deletable, just referenced).
+
+## Scope
+
+- `POST /api/settings/css` (import): accept raw CSS content, store it in the same
+  directory as settings/profiles ([008](008-settings-model.md)), return an id/handle.
+- `DELETE /api/settings/css/:id`: remove an imported CSS file; reject deletion for
+  linked (non-imported) entries.
+- `POST /api/settings/css/link`: register a path/URL reference without copying
+  content; these are never deletable via the delete endpoint (only "unlink"-able,
+  if that distinction matters — clarify in implementation).
+- Settings model tracks the list of CSS entries (imported + linked) with enough
+  metadata to distinguish the two kinds.
+- Serve imported CSS content back so the frontend can `<link>`/inline it.
+
+## Acceptance criteria
+
+- Importing CSS persists content under the settings directory and survives restart.
+- Deleting an imported CSS entry removes the file and the settings reference.
+- Attempting to delete a linked (non-imported) entry is rejected.
+- Linked entries resolve to their original path/URL, not a copy.
+
+## Depends on
+
+- [008 — Settings model](008-settings-model.md)