Restore the feed bar container and name a single active filter

[bradleymackey]

Summary

The feed's bottom bar (tag pills + item count + Clear/Edit) lost its container and its descriptive filter text. These were two separate changes, months apart — and neither was #551, which only touched the backup screens:

• The container — 510bfeaa (Rebuild the feed bottom bar on standard SwiftUI controls #555) deleted .background(Color.primary.opacity(0.05)) + .clipShape(RoundedRectangle(cornerRadius: 12)) from the status row, on the stated grounds that "the controls sit on the content the way a system bottom bar does". The controls were left with no surface at all, so the LazyVGrid scrolled directly under the status label.
• The detail — 315486f5 (Fix edit mode access during search #499, January) replaced the localized prose "2 tag filters" with a bare • 🏷 2 badge.

For the record: there is no sort control in the app and never has been (git log --all -i -S "sort" -- Sources/VaultiOS is empty). Order is fixed to .relativeOrder at the store layer and rearranged by drag in edit mode.

What changed

• The container is back exactly where it was: Color.primary.opacity(0.05) + RoundedRectangle(cornerRadius: 12) around the status row only, inset by 12pt. The tag pills stay above it, sitting directly on the content — that is the original arrangement and it is the one restored here.
• A single active filter is named (• 🏷 work). The pill row scrolls horizontally, so an active tag can sit off-screen; the name is information the bare count never carried. With more than one filter there is no room for names inside the container, so it shows the bare count exactly as before (• 🏷 2).
• Item count is localized: statusLabel hardcoded English count == 1 ? "item" : "items". It now uses the existing feedViewModel.searching.title.%lld plural via a new VaultDataModel.itemsCountDescription, mirroring filteringByTagsDescription. (That plural lives in VaultFeed's bundle, so it cannot be read from VaultiOS's localized(), which resolves against the "Feed" table.)

The button styles introduced by #555 (.bordered / .borderedProminent capsules, Toggle-based tag pills) are left alone — those were an accessibility fix, not part of the regression.

A material was tried and rejected

The first attempt replaced the container with a full-width .bar material across the whole safeAreaInset. Two problems, both visible in the history of this branch:

1. It pulled the tag pills inside the band, which is not how the bar is meant to read.
2. .background(.bar) applied directly puts the label in a vibrancy context. That is not cosmetic — it rendered the key.horizontal and tag.fill icons completely invisible and forced the secondary text to black. (.background { Rectangle().fill(.bar) } avoids the vibrancy, if a material is ever wanted here.)

Manifesto

Reviewed against MANIFESTO.md. C5 / C2 are the live ones and drove an explicit non-goal: no "matched of total" count. The feed query filters on visibility == always and unions search-passphrase matches only when the query matches (PersistedLocalVaultStore.swift:42-49, 102-106), so items.count deliberately excludes passphrase-hidden items. Surfacing an unfiltered total would disclose that hidden items exist and let a coercer diff the two numbers. The status label still counts only what the feed already displays, and itemsCountDescription carries a doc comment saying so. Nothing else is touched: no bulk operation (C1), no telemetry (C3), no auth change (C4), no undo or audit surface (C6), no default flipped (C7), no step removed from a sensitive flow (C8), no duress feature advertised (C9), no payload change (C10).

Testing

• Full iOSAllTests plan passes locally on iPhone 18 Pro Max / iOS 27.0.
• Feed snapshots re-recorded and visually compared against git show 510bfeaa^:…/unifiedBar_multipleTagsFiltered.1.png to confirm the layout matches the original. Two added — unifiedBar_singleFilterIsNamed and unifiedBar_multipleFiltersFallBackToCount — pinning both sides of the naming threshold.
• The navigation and autofill suites that embed the feed were re-recorded too.

⚠️ Automatic CI is still disabled (#548), so this is local verification only.

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