List view is now the default. A toggle in the toolbar switches between
list and grid. List rows use NcListItem with mtime subname and a star
indicator for favourites. The chosen mode persists via the new
settings/overview/grid_view endpoint.

Signed-off-by: James Manuel <moodyjmz@users.noreply.github.com>

…le toggle, a11y fixes

- Center search bar; move view toggle into a files section header alongside
  a "Recent {category}" h2 heading
- Toggle is now a single button switching icon based on current mode
- TemplateSection gets a subtle background (--color-background-hover) and
  uses h2 + aria-labelledby for correct heading hierarchy
- FileCard changed from div to button for keyboard accessibility;
  adds focus-visible outline

Signed-off-by: James Manuel <moodyjmz@users.noreply.github.com>

Blank card was taller than template cards because min-height and
padding-bottom combined. Replaced flex centering with absolute
positioning for the icon so height is driven by padding-bottom alone.

Template preview URLs were null from the API despite hasPreview: true.
Generate from fileid using /core/preview (mirrors TemplatePreview.vue).

File grid preview URLs now include etag version param and mimeFallback=1
so broken previews degrade to MIME icons rather than broken img elements.

Signed-off-by: James Manuel <moodyjmz@users.noreply.github.com>

Guard setOverviewGridView() against a null userId by returning 401
rather than writing to an empty-string uid. Mirror the same null guard
in OverviewController::index() when reading the stored grid-view pref.

Also rename the initial state key from 'config' to 'overview_config' to
avoid colliding with any existing config state provided by other parts
of the app.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Signed-off-by: James Manuel <moodyjmz@users.noreply.github.com>

…meFallback param

Replace the ratio-based padding-bottom trick in TemplateSection with a
fixed 2/3 aspect-ratio so all categories (docs, sheets, presentations)
render at the same height. Switch .template-card__preview to flex
centering, removing the now-redundant absolute-position rule on the
blank card icon.

Add an @error handler that sets failedPreviews[fileid] so a broken
image falls back to the file-type icon without a broken-image glitch.
Use template.previewUrl when the API provides it, otherwise derive the
URL from the fileid.

In OfficeOverview, fix the preview URL to use mimeFallback=true
(boolean string) instead of mimeFallback=1, and update the loadState
key to match the renamed initial state ('overview_config').

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Signed-off-by: James Manuel <moodyjmz@users.noreply.github.com>