Release v0.7.2 — Settings polish + container CRUD

- Containers can now be added, edited, and removed from the UI
  (/containers/new and the delete button on /containers/<name>).
  No more manual config.yml edits for normal container work.
- Test-notification buttons on Gotify and Pushover sections.
  Uses live form values and surfaces HTTP errors.
- Toggle switches replace enabled checkboxes.
- Priority reference block with Pushover mapping.
- Config diagnostics strip (path + writable badge + version) on
  every settings page — catches read-only bind mounts.
- Containers listed in the settings left rail.
- Color input: 10 swatches + native color picker + hex text.
- Status page no longer prints the "auto-refreshes" text.

CHANGELOG.md

@@ -7,6 +7,50 @@ Version numbers follow [Semantic Versioning](https://semver.org/spec/v2.0.0.html
 
 ---
 
+## [0.7.2] — 2026-10-27
+
+### Added
+
+- **Container CRUD from the UI.** `/containers/new` adds a new container to
+  `config.yml`; a delete button on `/containers/<name>` removes one. The config
+  change is picked up on the next polling cycle without a restart.
+- **Test-notification buttons** on the Gotify and Pushover sub-sections. The
+  button posts the current (unsaved) form values to `POST /api/test-notify/<channel>`
+  and shows the result inline. Unlike the regular notifier it does not swallow
+  errors — HTTP failures are reported back to the UI.
+- **Priority reference** block on the Notifications section, including the
+  Inspector → Pushover `-2..2` mapping.
+- **Config diagnostics strip** at the bottom of every settings page: shows the
+  live `config.yml` path, whether it's writable, and the Inspector version. If
+  the bind mount is read-only (a common deployment misconfiguration — a `:ro`
+  mount means saves fail silently) a red `READ-ONLY` badge appears with a hint.
+- **Containers listed in the settings left rail** under their own group, plus a
+  "+ Add container" link, so you can jump between sections and containers from
+  the same navigation.
+- **Color input upgrade** on container edit / new forms: ten preset color swatches,
+  a native color picker, and the existing hex text field, all bound together.
+
+### Changed
+
+- **Toggle switches** replace the stock checkbox + "requires restart" layout for
+  all `enabled`-style fields (notifications, dashboard, database, health summary,
+  maintenance, notification mute, container enabled, Inspector `dry_run` /
+  `heartbeat`). Reads much cleaner.
+- **Status page** no longer prints "auto-refreshes every 30s" (the `<meta refresh>`
+  still ticks every 30s).
+
+### Internal
+
+- `_apply_container_create()` + `_apply_container_delete()` helpers alongside the
+  existing `_apply_settings_update()`; container names are validated against
+  `^[a-zA-Z0-9][a-zA-Z0-9_-]{0,62}$` and rejected if duplicate.
+- `_render_diag_strip()` uses `os.access(path, os.W_OK)` to detect read-only mounts.
+- Test-notification bypasses `GotifyNotifier.notify()` / `PushoverNotifier.notify()`
+  so HTTP failures are surfaced (the real notifier intentionally swallows them to
+  avoid breaking the inspector loop).
+
+---
+
 ## [0.7.1] — 2026-10-27
 
 ### Changed