chore: one changeset for the release, and no new em-dashes

Consolidates the four contributor changesets, and rewords the em-dashes this release
added in comments and docs. The five in test/settings-save-failure-ui.test.ts stay:
they assert existing toast text.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/api-reference.md

@@ -1259,7 +1259,7 @@ authStyle?, defaultModelId?, defaultContextLength? }` creates one. `id`
   `total_slots`) for whatever the command did not answer, and OVERWRITES the
   listed figure for that model; the model's own listing
   (`context_length`, then `context_window`) only ever fills the gap when
-  neither probe does, and is recorded as a single-slot figure —
+  neither probe does, and is recorded as a single-slot figure:
   llama-swap lists the PER-SLOT window, so whenever the listed figure is
   the one taken the stored slot count is 1. A server with no `status`
   field on any entry (plain llama.cpp, a non-llama-swap gateway) gets no