fix: page-title avatar updates on theme toggle

Extends the previous theme-toggle fix to cover the page-title render
path. `block.cljs:3223` (page-title) routes through `icon-picker` →
`icon-picker-trigger-icon` → `(icon …)`, bypassing `get-node-icon-cp`
entirely. The earlier `(state/sub :ui/theme)` on `get-node-icon-cp`
covered the sidebar, cmdk, breadcrumb, and inline page references,
but the page-title's reactive boundary is `icon-picker-trigger-icon`
— which only subscribed to `:ui/icon-hover-preview`, not theme.
Result: page-title avatars with user-picked custom hex colors (which
get contrast-adjusted differently per theme via `adjust-for-contrast`)
stayed frozen with the previous theme's tone until something else
triggered a re-render.

One-line patch: add `_theme (state/sub :ui/theme)` to the trigger's
let block. The subscribed value is discarded; the subscription is
just there to tick Rum's dependency graph when the user hits `t t`.

Known follow-up: same pattern exists in other less-trafficked render
paths (avatar-cp picker-tile, custom-tab-cp preview, asset-picker
customize-band, and a handful of external callers in property/value,
property, property/config, views). They'll exhibit the same staleness
but only when visible — most are picker-internal (rare during theme
toggle). Best addressed in a focused refactor that extracts the
avatar-only and colored-icon branches of `icon` into reactive
subcomponents, killing the bug class at the right abstraction layer.
Filed for after this PR lands.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/main/frontend/components/icon.cljs

@@ -6970,6 +6970,14 @@
   trigger only reflects previews from a Default-Icon-scoped picker."
   [icon-value preview-target-db-id icon-props & [property]]
   (let [property (or property :logseq.property/icon)
+        ;; Re-render on theme toggle so the inline `style="background-
+        ;; color:#...;color:#..."` produced by `avatar-fallback-style`
+        ;; recomputes against the new theme's CSS variables. The
+        ;; page-title (`block.cljs:3223`) routes through `icon-picker`
+        ;; → this trigger and bypasses `get-node-icon-cp` entirely, so
+        ;; the `:ui/theme` sub on get-node-icon-cp (icon.cljs:913)
+        ;; doesn't cover the page-title path.
+        _theme (state/sub :ui/theme)
         preview (when preview-target-db-id (state/sub :ui/icon-hover-preview))
         preview-active? (and preview
                              (icon-preview-matches? preview preview-target-db-id property))