feat(studio): editorial Today hero on the store (v0.30.0)

App-store research shows that the most loved discovery
surfaces — Apple's Today tab being the canonical example —
work because editors tell stories instead of stacking
algorithmic recommendations. F∆I has no surveillance budget
and no monetization pressure, so we lean fully into editorial
curation.

This commit adds `_StoreTodayHero`, the first surface a
browsing operator sees:

- Single curated story per release, kept const in
  [_kCurrentTodayStory] so the narrative is reviewable in code
  review and ships in the audit log via the binary hash. No
  CMS, no network, no surveillance.
- Bilingual content shipped inline (`titleEn`/`titleDe`,
  `bodyEn`/`bodyDe`) so KRITIS deployments don't need a
  translation backend.
- Gradient backdrop with hero icon, deck, narrative paragraph,
  optional CTA. Visual treatment matches Apple Today's
  hierarchy: badge → headline → body → action.
- Auto-hides whenever a filter is active so a purposeful
  search isn't pushed below the fold.
- Per-session dismiss button — no permanent suppression, the
  next Studio launch shows it again so a release-bumped story
  has a chance to be seen.

Current story (Studio v0.30.x) directs operators to the new
recommended-sources strip, closing the loop between editorial
context and one-click action.

Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

lib/l10n/app_de.arb

@@ -118,6 +118,9 @@
     "placeholders": { "n": { "type": "int" } }
   },
   "storeReloadTooltip": "Aktualisieren",
+  "storeTodayBadge": "HEUTE",
+  "storeTodayDeck": "Von der F∆I-Redaktion",
+  "storeTodayDismissTooltip": "Für diese Sitzung ausblenden",
   "storePillInstalled": "installiert",
   "storePillUpdate": "Update",
   "storeUpdateButton": "Update auf {version}",

lib/l10n/app_en.arb

@@ -119,6 +119,9 @@
     "placeholders": { "n": { "type": "int" } }
   },
   "storeReloadTooltip": "Reload",
+  "storeTodayBadge": "TODAY",
+  "storeTodayDeck": "From the F∆I editor",
+  "storeTodayDismissTooltip": "Hide for this session",
   "storePillInstalled": "installed",
   "storePillUpdate": "update",
   "storeUpdateButton": "Update to {version}",

lib/l10n/app_localizations.dart

@@ -692,6 +692,24 @@ abstract class AppLocalizations {
   /// **'Reload'**
   String get storeReloadTooltip;
 
+  /// No description provided for @storeTodayBadge.
+  ///
+  /// In en, this message translates to:
+  /// **'TODAY'**
+  String get storeTodayBadge;
+
+  /// No description provided for @storeTodayDeck.
+  ///
+  /// In en, this message translates to:
+  /// **'From the F∆I editor'**
+  String get storeTodayDeck;
+
+  /// No description provided for @storeTodayDismissTooltip.
+  ///
+  /// In en, this message translates to:
+  /// **'Hide for this session'**
+  String get storeTodayDismissTooltip;
+
   /// No description provided for @storePillInstalled.
   ///
   /// In en, this message translates to:

lib/l10n/app_localizations_de.dart

@@ -345,6 +345,15 @@ class AppLocalizationsDe extends AppLocalizations {
   @override
   String get storeReloadTooltip => 'Aktualisieren';
 
+  @override
+  String get storeTodayBadge => 'HEUTE';
+
+  @override
+  String get storeTodayDeck => 'Von der F∆I-Redaktion';
+
+  @override
+  String get storeTodayDismissTooltip => 'Für diese Sitzung ausblenden';
+
   @override
   String get storePillInstalled => 'installiert';
 

lib/l10n/app_localizations_en.dart

@@ -363,6 +363,15 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get storeReloadTooltip => 'Reload';
 
+  @override
+  String get storeTodayBadge => 'TODAY';
+
+  @override
+  String get storeTodayDeck => 'From the F∆I editor';
+
+  @override
+  String get storeTodayDismissTooltip => 'Hide for this session';
+
   @override
   String get storePillInstalled => 'installed';