Rework Dashboard, add toasts, container folders/icons/WebUI links, detail tabs

Dashboard:
- Plain-count stat tiles (Running/Stopped/Pods/Images/Volumes/Networks)
  separated from a single "Resource Usage" card (CPU/Memory/Swap/Storage
  meter rows) instead of forcing both into one tile grid, which produced
  awkward spanning-tile/dead-cell layouts.
- Fixed CPU usage never changing (libpod's own cpuUtilization is computed
  once and never resampled) by computing it from /proc/stat deltas instead.
- Fixed memory usage reading far too high by using /proc/meminfo's
  MemAvailable instead of libpod's raw (non-reclaimable-aware) memFree.
- Added an Autostart Queue table reusing podman-autostart.sh's own
  failure-counter files.
- Dashboard and Containers now auto-refresh every ~2s (paused when the
  tab is hidden or a modal is open).

Toasts:
- Real success/warn/error/info toast notifications replacing every
  alert() used for one-way feedback, across every panel.

Container detail modal:
- 5 new tabs: Resources, Logs, Console, Events, Healthcheck.

Containers panel:
- Folders to group containers (name + icon), stored in the plugin's own
  folders.json — a folder's header always shows an icon+name+status chip
  per member, matching Unraid's own Docker page folders. "Move to
  Folder" becomes "Remove from Folder" once a container is already
  grouped.
- Containers can carry an icon URL and a WebUI URL (small button next to
  the name), both stored as container labels and auto-filled from
  templates where applicable.
- Settings: an "Add container" control for the Autostart order table.

Fixes:
- Context menus now measure their own rendered size and flip above the
  anchor when there isn't room below, instead of running off-screen.
- Containers table now uses table-layout:fixed with explicit column
  widths — auto layout was shifting every column (and the header) on
  every folder expand/collapse, and briefly again when a flex wrapper
  was mistakenly placed directly on a <td>.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

CHANGELOG.md

@@ -9,6 +9,112 @@ see [docs/ARCHITECTURE.md](docs/ARCHITECTURE.md#52-build-strategie)).
 
 ## [Unreleased]
 
+### Added
+- Containers panel: folders to group containers (name + optional icon
+  URL), purely cosmetic organizational metadata stored in the plugin's
+  own `folders.json` — podman itself has no such concept, same as
+  Unraid's own Docker page's folders. "+ New Folder", a "Move to Folder"
+  submenu on each container's row menu, and per-folder rename/delete
+  (deleting a folder only ungroups its containers, never touches them).
+  A folder with nothing assigned yet still shows up (so there's
+  somewhere to move a container into); one that's merely hidden by the
+  current search/filter does not. A folder's header always shows an
+  icon+name+status chip per member — collapsed or expanded, matching how
+  Unraid's own Docker page folders behave — rather than hiding everything
+  behind a bare count; clicking a chip opens the same row menu the "⋮"
+  button does (Details is now a menu item there too, alongside
+  Pause/Kill/Rename/Edit/Remove) rather than jumping straight to the
+  detail modal. "Move to Folder" only shows for a container that isn't
+  grouped yet — once it's in one, that item becomes a direct "Remove
+  from Folder" instead, since "move to a folder" reads as "add" and is
+  ambiguous/redundant once it's already in one. Containers can also
+  carry an icon URL (settable in the create/edit form, auto-filled when
+  creating from a template) shown in the table instead of the 2-letter
+  initials avatar.
+- Containers can now carry a WebUI URL too (create/edit form, preserved
+  through Update/Update All the same way the icon URL is), shown as a
+  small open-in-new-tab button next to the name in the Containers table
+  when set. Both this and the icon are stored as the plugin's own
+  container labels (`podman-webui.weburl`/`.icon`), read straight off
+  the already-fetched container list — no extra per-container calls.
+- Container detail modal: 5 new tabs (Resources, Logs, Console, Events,
+  Healthcheck), rounding it out from 6 to 11 of prompt.md's 12 requested
+  tabs (Volumes was left merged into the existing Mounts tab — same
+  underlying source/destination data, a separate tab would just repeat
+  it). Resources shows live CPU/memory alongside configured limits
+  (memory/swap/CPU/PIDs/block-I/O — a `0` in podman's own HostConfig
+  means "unlimited", not zero). Logs reuses the existing per-container
+  logs endpoint. Console opens a real ttyd/podman-exec session scoped to
+  the modal, cleaned up (killing the ttyd process server-side) on every
+  way of leaving — switching tabs, Close, backdrop click, or Escape —
+  not just on an explicit Disconnect, so peeking at a console doesn't
+  leak an orphaned ttyd process. Events and Healthcheck are both one-shot
+  historical queries (libpod's `/events?stream=false` for the last 7
+  days, and inspect's own `State.Health.Log`) rather than a live stream,
+  which stays out of scope (see dashboard.js's own note on why).
+- A real toast notification system (success/warning/error/info, auto-
+  dismissing, stacked bottom-right, dismissible early) replacing every
+  `alert()` used for one-way feedback across Containers, Images, Volumes,
+  Networks, Pods, Templates, Compose, and Settings — confirmations stay
+  native `confirm()` (a decision, not a notice), and long command output
+  (`podman compose up/down`, previously also an `alert()`) now goes to
+  the existing scrolling log-modal instead, which fits it better than a
+  toast ever could.
+- Dashboard reworked: a clean 6-tile row of plain counts (Running,
+  Stopped, Pods, Images, Volumes, Networks — colored green/red on
+  Running/Stopped so fleet health reads at a glance), a single "Resource
+  Usage" card with aligned CPU/Memory/Swap/Storage meter rows (bars shift
+  to warn/bad colors above 75%/90% instead of staying accent-colored at
+  any value), and an "Autostart Queue" table (reusing
+  `podman-autostart.sh`'s own per-container failure counters, so it shows
+  exactly what that script would decide, not a second tracked history).
+  Bar-and-percentage metrics were kept out of the plain-count tile grid
+  entirely after an earlier attempt at combining them (a tile spanning
+  multiple grid columns) left dead, empty cells in the layout.
+- Dashboard and Containers now auto-refresh every ~2s (paused while the
+  tab is hidden or a modal is open) instead of requiring a manual
+  Refresh click to see current state.
+- Settings: an "Add container" dropdown + button above the Autostart
+  order table — previously that table could only reorder/remove
+  containers already in the chain, with no way to add one in the first
+  place.
+- Containers: "Update All" now also removes the old, now-unused image
+  version each updated container leaves behind (only when at least one
+  container actually updated), instead of leaving stale images to pile up
+  on disk after every update run.
+
+### Fixed
+- Dashboard memory usage was calculated from libpod's raw `memFree` (which
+  excludes reclaimable buffers/cache), showing usage far higher than
+  reality — e.g. 67% "used" where `free -h` reported 19%. Now reads
+  `/proc/meminfo`'s `MemAvailable` directly, matching what `free -h` and
+  most monitoring tools show.
+- Dashboard CPU usage never changed — libpod's own `/info` computes
+  `cpuUtilization` once and never resamples it (confirmed live: three
+  calls seconds apart returned byte-identical numbers). Now computed from
+  `/proc/stat` deltas between successive requests, the same technique
+  `top`/`htop` use, which auto-refresh's ~2s cadence fits naturally.
+- Context menus (a container's "⋮", a folder's "⋮") always dropped down
+  from the anchor at a fixed position — opened from a row near the
+  bottom of the viewport, the menu ran off-screen with its last items
+  unreachable. Now measures its own actual rendered size (which varies
+  with item count) after appending and flips above the anchor instead
+  when there isn't enough room below, clamped horizontally too.
+- Expanding/collapsing a folder shifted every column (including the
+  header text) in the Containers table — its default `table-layout:
+  auto` sizes each column from the widest content among only the
+  currently-visible rows, so adding/removing a folder's rows changed
+  what counted as "widest" on every toggle. Columns now use explicit
+  fixed widths that don't depend on row content at all.
+- The Name column's content (icon + name + WebUI button) was
+  misaligned with its own header, drifting further off with every row —
+  putting `display:flex` directly on the `<td>` (to keep the WebUI
+  button on the same line as the name) pulls that cell out of
+  table-cell layout entirely, so with `table-layout:fixed` it stopped
+  respecting the column width its `<th>` assigns. The flex layout now
+  lives on a `<div>` inside the `<td>` instead, so the `<td>` itself
+  stays a normal, fixed-width table cell.
+
 ## [0.1.3] - 2026-07-12
 
 ### Added