apple: upgrade glass token to interactive Liquid Glass, add glass-container

[RCmerci]

Summary

Upgrades the glass background token to full iOS 26 Liquid Glass so Lui_element_combine chrome — composer capsule, composer_collapsed, and the buttons action capsules (the only "glass" users) — renders interactive glass with press feedback, without each app registering a custom tweak (as chat does today via LGChatLiquidGlassTweak).

Three changes, all inside LUIBackgroundStyleModifier / LUISurfaceModifier:

• "glass": content.glassEffect(in: shape) → content.glassEffect(.regular.interactive(), in: glassShape) on iOS 26/macOS 26. Below 26 the .regularMaterial fallback is unchanged.
• New "glass-container" token: on iOS 26/macOS 26 wraps the node's subtree in a GlassEffectContainer so sibling glass surfaces fuse into one region. A GlassEffectContainer wraps children rather than painting a background, but content inside the surface modifier is the node's whole subtree, so the same background: wire prop covers it — no new wire contract. Below 26 it degrades to content.background(color, in: shape) (a plain container; the name resolves to nil → clear for non-surface kinds).
• Shape fidelity: new LUIGlassShapePolicy.isPill(cornerRadius:height:) — true when corner_radius >= 999 (the sentinel composer_collapsed/n_action_button already send) or when the radius is ≥ half the declared height — selects Capsule() for the glass shape instead of a clamped RoundedRectangle. Avatars keep Circle(); non-glass surfaces' shape computation is untouched.

Other backends ignore the new token gracefully (Flutter/Qt/WinUI resolve unknown background names to transparent), and "glass-container" flows through the free-form background string prop — no OCaml/wire changes.

Verified: swift build, swift test (133), dune build, dune runtest (28) all green on macOS 26.5 / Swift 6.3.3.

Link to Devin session: https://app.devin.ai/sessions/cb54102d1f9b42c19804df4506305ac6
Open in Devin Desktop: https://app.devin.ai/desktop/session/cb54102d1f9b42c19804df4506305ac6?variant=devin
Requested by: @RCmerci

[devin-ai-integration]

I'll fix CI failures and address comments from users with write access. I'll skip comments containing "(aside)".

• Disable automatic comment, CI, and merge conflict monitoring

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-27T05:05:35.960138Z	5f340d9	PR opened

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[chatgpt-codex-connector]

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Reviewed commit: 5f340d9662

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[chatgpt-codex-connector]

Exclude glass containers from surface clipping

When glass-container is applied to a row or column used to group child glass surfaces, LUIClipRenderingPolicy still treats the non-transparent background name as visible and the later LUIOptionalClipModifier clips this entire wrapped subtree to a zero-radius rectangle. Child Liquid Glass halos, shadows, or animated fusion reaching the grouping node's bounds will therefore be cut off; special-case this container token as non-painting when deciding whether to clip.

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[devin-ai-integration]

Verified on iPhone 17 sim (iOS 26.5) — built the examples/components/ios-swiftui gallery app from this branch and exercised every background:"glass" surface it renders.

Glass Buttons page — all four surfaces render as translucent capsules with correct pill geometry (radius 999 → Capsule(); multi-action groups fuse into one capsule):

Interactive press confirmed — mid-press screenshots show the capsule responding (scale/highlight). Pixel-diff vs baseline: 6,256 px changed confined exactly to the capsule bounds — a non-interactive glassEffect(in:) would show zero delta:

Unpressed	Pressed

Combine page — the composer capsule renders as rounded-rect glass (radius 24 correctly stays RoundedRectangle, not pill) and composer_collapsed renders as a true capsule; both respond to press-hold (17k / 5k px deltas):

Regression pass on logseq_journal (linked against this lui revision via JOURNAL_LUI_PACKAGE_PATH): Cognito sign-in → E2EE unlock → timeline renders, bottom-bar glass capsules + account circle render, account menu opens, capture composer sheet presents and accepts text, block detail + back nav work, cold relaunch restores the timeline. Both apps idle at 0% CPU.

Caveats: logseq_journal itself emits no background:"glass" surfaces today (its glass chrome is native JournalChrome/SwiftUI toolbar, and its composer is a V.Sheet modal), so the modifier is verified via the gallery and journal got a runtime regression pass; the new glass-container token compiles but has no consumers yet; journal's composer sheet nav chrome doesn't render inside presented sheets on the sim — a known pre-existing host limitation, unrelated to this change.