diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index fe4408f..08e39ca 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -32,7 +32,7 @@ repos:
       - id: test
         name: Run zig build test
         entry: zig
-        args: ["build", "coverage", "-Dcoverage-threshold=74"]
+        args: ["build", "coverage", "-Dcoverage-threshold=75"]
         language: system
         types: [file]
         pass_filenames: false
diff --git a/src/tui.zig b/src/tui.zig
index 385f0f3..db71d99 100644
--- a/src/tui.zig
+++ b/src/tui.zig
@@ -527,6 +527,11 @@ pub const App = struct {
     symbol_owned: bool = false,
     scroll_offset: usize = 0,
     visible_height: u16 = 24, // updated each draw
+    /// Monotonic counter incremented each draw frame. Passed to the
+    /// active tab's `tick` hook so polling-based async work (future
+    /// observation engine async dispatch, etc.) has a wall-clock-
+    /// independent tick to react to.
+    frame: u64 = 0,
 
     has_explicit_symbol: bool = false, // true if -s was used
 
@@ -661,11 +666,11 @@ pub const App = struct {
 
         switch (mouse.button) {
             .wheel_up => {
-                self.moveBy(-3);
+                self.wheelBy(-3);
                 return ctx.consumeAndRedraw();
             },
             .wheel_down => {
-                self.moveBy(3);
+                self.wheelBy(3);
                 return ctx.consumeAndRedraw();
             },
             .left => {
@@ -1141,23 +1146,57 @@ pub const App = struct {
         return false;
     }
 
-    /// Move cursor/scroll. Positive = down, negative = up.
-    /// For tabs with a row cursor, moves the cursor by 1 with
-    /// debounce to absorb duplicate events from mouse wheel ticks.
-    /// For other tabs (or cursor-bearing tabs with empty rows),
-    /// adjusts scroll_offset by |n|.
+    /// Keyboard cursor movement (`j`/`k`/arrows). Positive = down,
+    /// negative = up, magnitude = 1 per keypress. For tabs with a
+    /// row cursor, moves the cursor; for tabs without one (or with
+    /// empty rows), adjusts scroll_offset.
+    ///
+    /// No debounce — keyboard input isn't bursty the way wheel
+    /// events are.
     fn moveBy(self: *App, n: isize) void {
-        // Migrated cursor-bearing tabs (portfolio, options, history).
-        // The hook returns false when it has no rows, so we fall
-        // through to scroll. Debounce applies to the cursor-move
-        // path only — preserving legacy behavior where wheel
-        // events on non-cursor views scroll without debounce.
         if (self.activeTabHas("onCursorMove")) {
-            if (self.shouldDebounceWheel()) return;
             if (self.dispatchBool("onCursorMove", .{n})) return;
             // Hook declined (empty rows) — fall through to scroll.
         }
-        // Non-cursor tabs: scroll the viewport directly.
+        self.scrollViewportBy(n);
+    }
+
+    /// Mouse-wheel-driven movement. Positive = down, negative = up,
+    /// magnitude = lines per detent (typically 3).
+    ///
+    /// Dispatch order:
+    ///   1. `onWheelMove` if declared — tab decides what wheel means
+    ///      (review tab uses this to ALWAYS scroll viewport rather
+    ///      than mix with cursor movement).
+    ///   2. `onCursorMove` — legacy "wheel moves cursor" behavior
+    ///      preserved for tabs that don't declare `onWheelMove`
+    ///      (portfolio, options, history at time of writing).
+    ///   3. Viewport scroll — fallback when the active tab has no
+    ///      cursor or the cursor hook declines (empty rows).
+    ///
+    /// Debounce applies — terminals typically batch 3-5 wheel events
+    /// per physical detent and we don't want to act on each one.
+    fn wheelBy(self: *App, n: isize) void {
+        if (self.activeTabHas("onWheelMove")) {
+            if (self.shouldDebounceWheel()) return;
+            if (self.dispatchBool("onWheelMove", .{n})) return;
+            // Tab handled wheel as viewport scroll (returned false);
+            // fall through.
+            self.scrollViewportBy(n);
+            return;
+        }
+        if (self.activeTabHas("onCursorMove")) {
+            if (self.shouldDebounceWheel()) return;
+            if (self.dispatchBool("onCursorMove", .{n})) return;
+        }
+        self.scrollViewportBy(n);
+    }
+
+    /// Adjust the App-level scroll_offset by `n` (signed, positive =
+    /// down, negative = up). Clamps at 0; no upper bound (the draw
+    /// path handles overflow visually). Shared by `moveBy` and
+    /// `wheelBy` as their fallback.
+    fn scrollViewportBy(self: *App, n: isize) void {
         if (n > 0) {
             self.scroll_offset += @intCast(n);
         } else {
@@ -1586,6 +1625,13 @@ pub const App = struct {
         const self: *App = @ptrCast(@alignCast(ptr));
         const max_size = ctx.max.size();
 
+        // Per-frame tick dispatch to the active tab. Tabs that
+        // don't declare a `tick` hook fall through to the
+        // framework's `noopTick`. Used for polling-based async
+        // work (future observation engine async dispatch, etc.).
+        self.frame +%= 1;
+        self.dispatchVoid("tick", .{self.frame});
+
         if (max_size.height < 3) {
             return .{ .size = max_size, .widget = self.widget(), .buffer = &.{}, .children = &.{} };
         }
diff --git a/src/tui/history_tab.zig b/src/tui/history_tab.zig
index 7cc01a7..d7775d4 100644
--- a/src/tui/history_tab.zig
+++ b/src/tui/history_tab.zig
@@ -152,6 +152,8 @@ pub const State = struct {
     /// Per-bucket expansion set. Keyed by `BucketKey` (tier + days)
     /// to disambiguate edge-aligned parents and children. Initialized
     /// in `init` (requires an allocator).
+    // SAFETY: overwritten by `init()` before any read; the framework
+    // contract guarantees `init` runs before `activate`/draw paths.
     expanded_buckets: std.AutoHashMap(BucketKey, void) = undefined,
 };
 
@@ -288,6 +290,17 @@ pub const tab = struct {
         return true;
     }
 
+    /// Mouse wheel: always scroll the viewport, never move the
+    /// cursor. Keeps wheel-as-look-around and cursor-as-pointer
+    /// distinct. The framework falls through to viewport scroll
+    /// when this returns false.
+    pub fn onWheelMove(state: *State, app: *App, delta: isize) bool {
+        _ = state;
+        _ = app;
+        _ = delta;
+        return false;
+    }
+
     /// Mouse handling: a left-click on a row moves the cursor and
     /// toggles tier expansion (no-op for non-tier rows). Returns
     /// `true` if the click landed on a data row in the recent-
diff --git a/src/tui/options_tab.zig b/src/tui/options_tab.zig
index 564bc6f..5f7aaae 100644
--- a/src/tui/options_tab.zig
+++ b/src/tui/options_tab.zig
@@ -256,6 +256,17 @@ pub const tab = struct {
         ensureCursorVisible(state, &app.scroll_offset, app.visible_height);
         return true;
     }
+
+    /// Mouse wheel: always scroll the viewport, never move the
+    /// cursor. Keeps wheel-as-look-around and cursor-as-pointer
+    /// distinct. The framework falls through to viewport scroll
+    /// when this returns false.
+    pub fn onWheelMove(state: *State, app: *App, delta: isize) bool {
+        _ = state;
+        _ = app;
+        _ = delta;
+        return false;
+    }
 };
 
 // ── Cursor movement / visibility (private; called from onCursorMove) ──
diff --git a/src/tui/portfolio_tab.zig b/src/tui/portfolio_tab.zig
index 003129e..e6a4b74 100644
--- a/src/tui/portfolio_tab.zig
+++ b/src/tui/portfolio_tab.zig
@@ -420,6 +420,17 @@ pub const tab = struct {
         return true;
     }
 
+    /// Mouse wheel: always scroll the viewport, never move the
+    /// cursor. Keeps wheel-as-look-around and cursor-as-pointer
+    /// distinct. The framework falls through to viewport scroll
+    /// when this returns false.
+    pub fn onWheelMove(state: *State, app: *App, delta: isize) bool {
+        _ = state;
+        _ = app;
+        _ = delta;
+        return false;
+    }
+
     /// Pre-empt key handler. Called by the framework BEFORE
     /// global keymap matching runs. When portfolio is in a
     /// modal sub-state (`state.modal != .none`) we route to the
diff --git a/src/tui/tab_framework.zig b/src/tui/tab_framework.zig
index f301816..aa578dc 100644
--- a/src/tui/tab_framework.zig
+++ b/src/tui/tab_framework.zig
@@ -68,16 +68,40 @@
 //!     /// this hook.
 //!     pub fn onScroll(state: *State, app: *App, where: ScrollEdge) void { ... }
 //!
-//!     /// Fired when the user invokes a relative cursor-move
-//!     /// (`j`/`k`, ↑/↓, mouse wheel). `delta` is signed: positive
-//!     /// = down, negative = up. Magnitude is 1 for keys, larger
-//!     /// for wheel events. Tabs with a row cursor step it,
-//!     /// clamp to row count, and ensure visibility; return
-//!     /// `true` to consume. Tabs without a cursor (or with empty
-//!     /// rows) return `false` so the framework falls through to
-//!     /// scroll-by-`delta` instead.
+//!     /// Fired when the user invokes a relative cursor-move via
+//!     /// keyboard (`j`/`k`, ↑/↓). `delta` is signed: positive =
+//!     /// down, negative = up. Magnitude is 1 per keypress. Tabs
+//!     /// with a row cursor step it, clamp to row count, and
+//!     /// ensure visibility; return `true` to consume. Tabs without
+//!     /// a cursor (or with empty rows) return `false` so the
+//!     /// framework falls through to scroll-by-`delta` instead.
+//!     ///
+//!     /// **Mouse wheel events go through `onWheelMove`, NOT this
+//!     /// hook.** A tab that wants wheel-as-cursor-move (the legacy
+//!     /// portfolio-tab convention) implements `onWheelMove` to
+//!     /// delegate to `onCursorMove`. A tab that wants
+//!     /// wheel-as-viewport-scroll (the cleaner default for tabs
+//!     /// with multiple cursor regions) declines `onWheelMove` and
+//!     /// the framework scrolls instead.
 //!     pub fn onCursorMove(state: *State, app: *App, delta: isize) bool { ... }
 //!
+//!     /// Fired when the user wheels the mouse. `delta` is signed:
+//!     /// positive = down, negative = up. Magnitude is whatever the
+//!     /// terminal reports per wheel detent (typically 3-5 lines on
+//!     /// most platforms; the framework already debounces).
+//!     ///
+//!     /// Return `true` to consume; return `false` to fall through
+//!     /// to viewport scroll. If a tab omits this hook entirely,
+//!     /// the framework's default behavior is to delegate to
+//!     /// `onCursorMove` — which preserves the legacy
+//!     /// "wheel moves cursor" behavior for single-cursor tabs.
+//!     ///
+//!     /// New multi-region tabs (e.g. review tab with separate
+//!     /// holdings + findings tables) should declare this hook and
+//!     /// return `false` so wheel always scrolls the viewport,
+//!     /// reserving cursor movement for keyboard and click.
+//!     pub fn onWheelMove(state: *State, app: *App, delta: isize) bool { ... }
+//!
 //!     // ── Misc (required) ─────────────────────────────────────
 //!     pub fn isDisabled(app: *App) bool { ... }
 //! };
@@ -514,6 +538,16 @@ pub fn validateTabModule(comptime Module: type) void {
                 "pub fn onCursorMove(state: *State, app: *App, delta: isize) bool { ... }",
             );
         }
+        if (@hasDecl(tab_decl, "onWheelMove")) {
+            validator.expectFn(
+                "Tab module",
+                mod_name,
+                tab_decl,
+                "onWheelMove",
+                fn (*State, *App, isize) bool,
+                "pub fn onWheelMove(state: *State, app: *App, delta: isize) bool { ... }",
+            );
+        }
     }
 }