Merge pull request 'fix(ui): Vuetify-4 review polish — active-tab indicator + one continuous chrome gradient' (#226) from dev into main

frontend/src/components/TopNav.vue

@@ -1,5 +1,5 @@
 <template>
-  <header class="fc-topnav">
+  <header class="fc-topnav" :class="{ 'fc-topnav--chrome': hasStickyChrome }">
     <div class="fc-nav-left">
       <RouterLink :to="FRONT_DOOR" class="fc-brand" aria-label="FabledCurator home">
         <img src="/favicon.svg" alt="" class="fc-brand__glyph" width="22" height="22" />
@@ -65,6 +65,7 @@
 
 <script setup>
 import { computed, onMounted } from 'vue'
+import { useRoute } from 'vue-router'
 import router, { FRONT_DOOR } from '../router.js'
 import { useSystemStore } from '../stores/system.js'
 import PipelineStatusChip from './PipelineStatusChip.vue'
@@ -72,6 +73,13 @@ import PipelineStatusChip from './PipelineStatusChip.vue'
 const system = useSystemStore()
 onMounted(() => system.refreshHealth())
 
+// Views that pin a sticky sub-header (filter bar / tabs) directly under the nav
+// declare `meta.stickyChrome`. On those, the nav doesn't fade to transparent at
+// its bottom — it hands off at the shared seam alpha so the sub-header can
+// continue the SAME fade (see .fc-chrome-continues in app.css). One gradient.
+const route = useRoute()
+const hasStickyChrome = computed(() => !!route.meta?.stickyChrome)
+
 // Every route with a meta.title is a nav entry. Order by meta.navOrder —
 // router.getRoutes() does NOT guarantee declaration order, so explicit numbers
 // pin the sequence (e.g. Explore after Gallery). Routes without one fall to the
@@ -129,6 +137,20 @@ const health = computed(() => {
   backdrop-filter: blur(2px);
   -webkit-backdrop-filter: blur(2px);
 }
+/* On a view with a sticky sub-header pinned beneath (meta.stickyChrome), the nav
+   stops fading at the shared seam alpha instead of going fully transparent — the
+   sub-header (.fc-chrome-continues) picks the fade up from there, so the two read
+   as one continuous gradient. Compound selector out-specifies .fc-topnav so it
+   wins regardless of Vite's production CSS ordering. --fc-chrome-* come from the
+   global :root in app.css (custom props inherit into scoped styles). */
+.fc-topnav.fc-topnav--chrome {
+  background: linear-gradient(
+    to bottom,
+    rgba(var(--fc-chrome-rgb), 0.92) 0%,
+    rgba(var(--fc-chrome-rgb), 0.72) 55%,
+    rgba(var(--fc-chrome-rgb), var(--fc-chrome-seam)) 100%
+  );
+}
 
 .fc-brand {
   display: flex;

frontend/src/components/gallery/GalleryFilterBar.vue

@@ -1,5 +1,5 @@
 <template>
-  <div class="fc-filterbar-wrap">
+  <div class="fc-filterbar-wrap fc-chrome-continues">
    <div class="fc-filterbar">
     <v-autocomplete
       v-model="selected"
@@ -313,20 +313,10 @@ function pushFilter(mutate) {
      and a gap shows through when scrolled to the top. */
   margin-top: -8px;
   margin-bottom: 12px;
-  /* EXACT same gradiated obsidian (#14171A = 20,23,26) frost as the TopNav so
+  /* The frost itself (obsidian fade + blur) is the shared .fc-chrome-continues
-     the two read as one continuous piece of chrome — images scroll visibly
+     primitive: it CONTINUES the TopNav's fade from the seam alpha to transparent
-     under both. The nav's gradient fades to transparent at ITS bottom; this
+     rather than re-darkening, so the nav + bar read as one gradient (operator
-     bar re-darkens at its top, so a faint seam (the page/image showing through
+     2026-07-13). This block only owns the sticky positioning now. */
-     the nav's transparent edge) separates them when scrolled to the very top,
-     while under-scroll they frost as one. */
-  background: linear-gradient(
-    to bottom,
-    rgba(20, 23, 26, 0.92) 0%,
-    rgba(20, 23, 26, 0.65) 60%,
-    rgba(20, 23, 26, 0) 100%
-  );
-  backdrop-filter: blur(2px);
-  -webkit-backdrop-filter: blur(2px);
 }
 .fc-filterbar {
   display: flex;

frontend/src/router.js

@@ -20,7 +20,7 @@ const routes = [
 
   // FC-2: image backbone
   { path: '/showcase', name: 'showcase', component: ShowcaseView, meta: { title: 'Showcase', navOrder: 10 } },
-  { path: '/gallery',  name: 'gallery',  component: GalleryView,  meta: { title: 'Gallery', navOrder: 20  } },
+  { path: '/gallery',  name: 'gallery',  component: GalleryView,  meta: { title: 'Gallery', navOrder: 20, stickyChrome: true } },
   // Explore: a 3-pane tagging workspace — walk an image's visual neighbours
   // (left) while tagging the focused image (center viewer + modal-parity tag
   // rail). Optional anchor param — the bare /explore nav entry SEEDS a random
@@ -29,11 +29,11 @@ const routes = [
   // Browse hub (operator-asked 2026-06-09): Posts / Artists / Tags as tabs —
   // the three "browse the library by an axis" surfaces. One nav entry; the old
   // standalone paths redirect into the matching tab (below).
-  { path: '/browse', name: 'browse', component: BrowseView, meta: { title: 'Browse', navOrder: 30 } },
+  { path: '/browse', name: 'browse', component: BrowseView, meta: { title: 'Browse', navOrder: 30, stickyChrome: true } },
   // Artist detail — no meta.title (reached by clicking an artist, not nav).
   { path: '/artist/:slug', name: 'artist', component: ArtistView },
   // Series browse — a nav entry (meta.title).
-  { path: '/series', name: 'series', component: SeriesView, meta: { title: 'Series', navOrder: 40 } },
+  { path: '/series', name: 'series', component: SeriesView, meta: { title: 'Series', navOrder: 40, stickyChrome: true } },
   // Series management — no meta.title (reached from a series card/tag).
   { path: '/series/:tagId', name: 'series-manage', component: SeriesManageView },
   // Series reader — immersive (no top nav, no meta.title).
@@ -41,10 +41,10 @@ const routes = [
 
   // FC-3: subscription backbone — purely management (sources/downloads),
   // distinct from the Browse hub.
-  { path: '/subscriptions', name: 'subscriptions', component: SubscriptionsView, meta: { title: 'Subscriptions', navOrder: 50 } },
+  { path: '/subscriptions', name: 'subscriptions', component: SubscriptionsView, meta: { title: 'Subscriptions', navOrder: 50, stickyChrome: true } },
 
   // Settings — config, pinned to the right of the nav (TopNav special-cases it).
-  { path: '/settings', name: 'settings', component: SettingsView, meta: { title: 'Settings' } },
+  { path: '/settings', name: 'settings', component: SettingsView, meta: { title: 'Settings', stickyChrome: true } },
 
   // The old standalone paths now redirect into the Browse hub, preserving any
   // deep-link query (e.g. /posts?post_id=N → /browse?tab=posts&post_id=N). The

frontend/src/styles/app.css

@@ -49,3 +49,47 @@
   ul, ol, figure, details, summary { padding: 0; margin: 0; }
   h1, h2, h3, h4, h5, h6, p { margin: 0; }
 }
+
+/* Active-tab indicator (operator-flagged 2026-07-13 in the Vuetify-4 review): v4's
+   MD3 v-tab "slider" underline renders wider than the tab and floats below it. The
+   active tab's TEXT is already accent-coloured (color="accent"), so drop the slider
+   and mark the active tab with a subtle accent fill + rounded top — a clean,
+   unambiguous highlight app-wide (Subscriptions / Browse / Settings / Series). */
+.v-tab__slider { display: none !important; }
+.v-tab[aria-selected="true"],
+.v-tab.v-tab--selected {
+  background: rgb(var(--v-theme-accent) / 0.12);
+  border-radius: 8px 8px 0 0;
+}
+
+/* --- Continuous chrome fade (operator-asked 2026-07-13: "group the sub-nav as
+   part of the nav and use a single gradient in them"). ------------------------
+   The TopNav and any sticky sub-header pinned directly beneath it (Gallery's
+   filter bar, the Browse/Series/Settings/Subscriptions tabs bars) used to each
+   paint their OWN dark-to-transparent gradient (or a solid band), so the fade
+   read as happening TWICE — dark, fade out, then dark again. Instead the two
+   share ONE obsidian fade: the nav paints the TOP half (opaque → the seam
+   alpha) and the sub-header paints the CONTINUATION (seam alpha → transparent)
+   over its own height. Both reference --fc-chrome-seam, so the alphas meet
+   exactly at the 64px boundary — no re-darkening, no doubling, one gradient.
+
+   --fc-chrome-seam is the single knob: raise it for a heavier sub-header (more
+   legible tabs/controls over scrolling content), lower it for a lighter fade. */
+:root {
+  --fc-chrome-rgb: 20, 23, 26;   /* obsidian #14171A — matches the TopNav */
+  --fc-chrome-seam: 0.46;        /* alpha where the nav hands off to the sub-header */
+}
+/* Applied to a sticky sub-header so it continues the nav's fade instead of
+   restarting it. Percentage stops so the fade always spans the element's height
+   (survives the filter bar's expanding refine panel). The blur keeps tabs and
+   controls legible as the fill thins toward transparent — the solid-surface
+   bars it replaces had none, so it must live here. */
+.fc-chrome-continues {
+  background: linear-gradient(
+    to bottom,
+    rgba(var(--fc-chrome-rgb), var(--fc-chrome-seam)) 0%,
+    rgba(var(--fc-chrome-rgb), 0) 100%
+  );
+  backdrop-filter: blur(2px);
+  -webkit-backdrop-filter: blur(2px);
+}

frontend/src/views/BrowseView.vue

@@ -7,7 +7,7 @@
          switcher and the search stay reachable no matter how far you scroll.
          Background uses the theme surface token so content scrolls cleanly
          under it (matches SettingsView's sticky tabs). -->
-    <div class="fc-browse__head">
+    <div class="fc-browse__head fc-chrome-continues">
       <v-container fluid class="py-0">
         <!-- Tabs and search share one row: the axis switcher on the left, the
              search field + active-scope chips on the right (operator-asked
@@ -156,7 +156,8 @@ function clearFilter(key) {
   position: sticky;
   top: 64px; /* directly under AppShell's 64px sticky TopNav */
   z-index: 4;
-  background: rgb(var(--v-theme-surface));
+  /* Background is the shared .fc-chrome-continues fade — it continues the nav's
+     gradient instead of a solid surface band (operator 2026-07-13). */
 }
 .fc-browse__bar {
   display: flex;

frontend/src/views/SeriesView.vue

@@ -4,7 +4,7 @@
          the 64px TopNav (operator-asked 2026-06-12), so the axis switcher and
          search/sort stay reachable on a long grid. The controls can't sit
          inside v-window (it clips sticky children), so they're hoisted here. -->
-    <div class="fc-series__head">
+    <div class="fc-series__head fc-chrome-continues">
       <v-tabs v-model="tab" density="compact">
         <v-tab value="browse">Browse</v-tab>
         <v-tab value="suggestions">
@@ -294,12 +294,13 @@ onMounted(() => {
 
 <style scoped>
 /* Sticky header (tabs + active-tab controls) pinned under the 64px TopNav, so
-   content scrolls cleanly beneath it. Surface bg matches SettingsView. */
+   content scrolls cleanly beneath it. Background is the shared
+   .fc-chrome-continues fade — continues the nav's gradient rather than a solid
+   band (operator 2026-07-13). */
 .fc-series__head {
   position: sticky;
   top: 64px;
   z-index: 4;
-  background: rgb(var(--v-theme-surface));
   padding-bottom: 12px;
 }
 .fc-series-browse__controls {

frontend/src/views/SettingsView.vue

@@ -7,13 +7,11 @@
     <!-- Sticky tabs: operator-flagged 2026-05-25 — long Import / Maintenance
          panels pushed the tab strip out of the viewport, forcing a scroll-
          to-top just to change tab. AppShell's TopNav is 64px sticky, so the
-         tab strip lives directly under it. Background uses the theme surface
+         tab strip lives directly under it. The .fc-chrome-continues fade
-         token so it visually merges with the page rather than the
+         continues the nav's gradient across the strip (operator 2026-07-13). -->
-         translucent v-tabs default. -->
     <v-tabs
-      v-model="tab" color="accent" class="mb-4"
+      v-model="tab" color="accent" class="mb-4 fc-chrome-continues"
-      style="position: sticky; top: 64px; z-index: 4;
+      style="position: sticky; top: 64px; z-index: 4;"
-             background: rgb(var(--v-theme-surface));"
     >
       <v-tab value="overview">Overview</v-tab>
       <v-tab value="activity">Activity</v-tab>

frontend/src/views/SubscriptionsView.vue

@@ -5,7 +5,7 @@
       align-tabs="start"
       color="accent"
       density="compact"
-      class="fc-subs-tabs"
+      class="fc-subs-tabs fc-chrome-continues"
     >
       <v-tab value="subscriptions">
         <v-icon start>mdi-account-multiple-check</v-icon>
@@ -63,7 +63,10 @@ const { tab } = useTabQuery(VALID_TABS, 'subscriptions')
 }
 .fc-subs-tabs {
   flex: 0 0 auto;
-  border-bottom: 1px solid rgb(var(--v-theme-on-surface-variant) / 0.18);
+  /* Cancel the shell's pt-2 so the tabs sit flush under the 64px nav, letting
+     the .fc-chrome-continues fade read as one gradient with it (operator
+     2026-07-13). The fade replaces the old border-bottom separator. */
+  margin-top: -8px;
 }
 .fc-subs-window {
   flex: 1 1 auto;