fix: Add table clipping + cursor animation API

Table clipping:
- Add clip region around table content area
- Prevents cell text from drawing outside table bounds
- Header and scrollbar render outside clip region

Cursor animation API:
- Add CURSOR_IDLE_TIMEOUT_MS (5s) and CURSOR_BLINK_PERIOD_MS (500ms) constants
- Add needsCursorAnimation() to check if cursor should blink
- Add getAnimationTimeout() for dynamic event loop timeout
- Update TextInput to use constants from Context

The application can now query ctx.getAnimationTimeout() to determine
if a short timeout is needed for cursor animation, or if it can wait
indefinitely for events.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/core/context.zig

@@ -99,6 +99,13 @@ pub const Context = struct {
     /// Used for idle detection (e.g., cursor stops blinking after inactivity)
     last_input_time_ms: u64 = 0,
 
+    /// Idle timeout for cursor blinking (ms). After this time without input,
+    /// cursor becomes solid and no animation frames are needed.
+    pub const CURSOR_IDLE_TIMEOUT_MS: u64 = 5000;
+
+    /// Cursor blink period (ms). Cursor toggles visibility at this rate.
+    pub const CURSOR_BLINK_PERIOD_MS: u64 = 500;
+
     const Self = @This();
 
     /// Frame statistics for performance monitoring
@@ -288,6 +295,27 @@ pub const Context = struct {
         return self.frame_delta_ms;
     }
 
+    /// Check if cursor animation is needed (for event loop timeout decisions).
+    /// Returns true if we're within the active period where cursor should blink.
+    /// The application should use a short timeout (e.g., 500ms) when this returns true,
+    /// and can use infinite timeout when false.
+    pub fn needsCursorAnimation(self: Self) bool {
+        if (self.current_time_ms == 0) return false;
+        const idle_time = self.current_time_ms -| self.last_input_time_ms;
+        return idle_time < CURSOR_IDLE_TIMEOUT_MS;
+    }
+
+    /// Get recommended event loop timeout in milliseconds.
+    /// Returns the time until next cursor blink toggle, or null for infinite wait.
+    pub fn getAnimationTimeout(self: Self) ?u32 {
+        if (!self.needsCursorAnimation()) return null;
+
+        // Calculate time until next blink toggle
+        const time_in_period = self.current_time_ms % CURSOR_BLINK_PERIOD_MS;
+        const time_until_toggle = CURSOR_BLINK_PERIOD_MS - time_in_period;
+        return @intCast(@max(time_until_toggle, 16)); // Minimum 16ms to avoid busy loop
+    }
+
     // =========================================================================
     // ID Management
     // =========================================================================

src/widgets/table/table.zig

@@ -13,6 +13,7 @@
 
 const std = @import("std");
 const Context = @import("../../core/context.zig").Context;
+const Command = @import("../../core/command.zig");
 const Layout = @import("../../core/layout.zig");
 
 // Re-export types
@@ -152,6 +153,11 @@ pub fn tableRectFull(
         }
     }
 
+    // Begin clipping to table content area (excludes header)
+    // This prevents cell text from drawing outside the table bounds
+    const content_y = bounds.y + @as(i32, @intCast(header_h));
+    ctx.pushCommand(Command.clip(bounds.x, content_y, bounds.w, content_h));
+
     // Calculate visible row range
     const first_visible = table_state.scroll_row;
     const last_visible = @min(first_visible + visible_rows, table_state.row_count);
@@ -189,7 +195,10 @@ pub fn tableRectFull(
         if (row_result.cell_edited) result.cell_edited = true;
     }
 
-    // Draw scrollbar if needed
+    // End clipping
+    ctx.pushCommand(Command.clipEnd());
+
+    // Draw scrollbar if needed (outside clip region)
     if (table_state.row_count > visible_rows) {
         render.drawScrollbar(ctx, bounds, table_state, visible_rows, config, colors);
     }

src/widgets/text_input.zig

@@ -364,16 +364,14 @@ pub fn textInputRect(
             if (ctx.current_time_ms == 0) break :blk true;
 
             // Check idle time (time since last user input)
-            const idle_timeout_ms: u64 = 5000; // 5 seconds
             const idle_time = ctx.current_time_ms -| ctx.last_input_time_ms;
 
-            if (idle_time >= idle_timeout_ms) {
+            if (idle_time >= Context.CURSOR_IDLE_TIMEOUT_MS) {
                 // Idle: cursor always visible (solid, no blink)
                 break :blk true;
             } else {
-                // Active: cursor blinks (visible for 500ms, hidden for 500ms)
-                const blink_period_ms: u64 = 500;
-                break :blk (ctx.current_time_ms / blink_period_ms) % 2 == 0;
+                // Active: cursor blinks
+                break :blk (ctx.current_time_ms / Context.CURSOR_BLINK_PERIOD_MS) % 2 == 0;
             }
         };