Per-content favicon: emit the node icon server-side, inherit the package mark, raster fallback for Safari

[rbuergi]

Observed

memex.meshweaver.cloud (rc6, 3933b50) never shows a content-dependent favicon, although the feature shipped (0b13c7851, 2026-08-18, in rc5+): every tab wears the portal favicon.ico.

$ curl -sL https://memex.meshweaver.cloud/Chess | grep -o '<link rel="icon"[^>]*>'
<link rel="icon" type="image/png" href="favicon.ico">

— while the same response carries the full og head (og:title "Chess", description, url), so the SSR pipeline ran; it just never emits the node's icon.

Why

1. The node icon link is circuit-only. ApplicationPage.TabIcon → <HeadContent><link rel="icon" …> renders only after the circuit connects and context.Node resolves. The prerendered HTML — first paint, crawlers, and any browser that doesn't honor late link swaps — carries only the static site favicon. OpenGraphPreviewService (which demonstrably runs server-side) has no icon output at all.
2. Safari never shows it regardless: Safari ignores SVG data: favicons (MeshNodeImageHelper.IconLinkFor emits image/svg+xml data URIs), so on macOS Safari the feature is invisible even in-circuit.
3. Child nodes fall back to a generic glyph. ResolveNodeIcon's chain is own icon → shipped glyph → NodeType default → neutral box. A lesson page under AgenticEngineering, a game under Chess, a doc under a package — none carries its own icon, so tabs show generic chrome instead of the package's mark.

Proposed

1. Emit <link rel="icon"> in the SSR head from the same node resolution the og tags use, so the first response already identifies the page; keep the circuit-side swap for in-circuit navigation.
2. Package-root inheritance: a node with no icon of its own resolves the PARTITION ROOT's icon before the NodeType default — every page under a package then wears that package's mark. (MeshWeaver.Plugins just aligned all 47 package marks to one language — bold 24×24 plate + white detail — precisely so they read at 16 px; Plugins Chat composer dropdowns (harness / agent / model) clip their top entries above the viewport #588.)
3. Raster fallback for Safari: a small endpoint (e.g. /api/icon/{path}.png?size=32|180) that rasterizes the resolved SVG — usable both as the image/png icon link Safari accepts and as apple-touch-icon.

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