feat: Implement keyboard system improvements (4 phases)

Phase 1: Frame timing in Context
- Added current_time_ms and frame_delta_ms to Context
- Added setFrameTime() method for applications to provide timing

Phase 2: Centralized shortcuts system
- Added StandardShortcut enum with common shortcuts (copy, paste, etc.)
- Added isStandardActive() function for checking shortcuts
- Updated TextInput to use centralized shortcuts

Phase 3: Incremental search in table
- Added search_buffer, search_len, search_last_time to TableState
- Added addSearchChar(), getSearchTerm(), clearSearch() methods
- Typing in focused table searches first column (case-insensitive)
- 1 second timeout resets search buffer

Phase 4: Blinking cursor in TextInput
- Cursor blinks every 500ms when field is focused
- Uses current_time_ms from Context for timing

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

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

src/core/context.zig

@@ -88,6 +88,13 @@ pub const Context = struct {
     /// Unified focus management system
     focus: FocusSystem,
 
+    /// Current time in milliseconds (set by application each frame)
+    /// Used for animations, cursor blinking, etc.
+    current_time_ms: u64 = 0,
+
+    /// Time delta since last frame in milliseconds
+    frame_delta_ms: u32 = 0,
+
     const Self = @This();
 
     /// Frame statistics for performance monitoring
@@ -248,6 +255,30 @@ pub const Context = struct {
         self.focus.focusNextGroup();
     }
 
+    // =========================================================================
+    // Timing
+    // =========================================================================
+
+    /// Set the current frame time (call once per frame, before beginFrame or after)
+    /// This enables animations, cursor blinking, and other time-based effects.
+    pub fn setFrameTime(self: *Self, time_ms: u64) void {
+        if (self.current_time_ms > 0) {
+            const delta = time_ms -| self.current_time_ms;
+            self.frame_delta_ms = @intCast(@min(delta, std.math.maxInt(u32)));
+        }
+        self.current_time_ms = time_ms;
+    }
+
+    /// Get current time in milliseconds
+    pub fn getTime(self: Self) u64 {
+        return self.current_time_ms;
+    }
+
+    /// Get time delta since last frame in milliseconds
+    pub fn getDeltaTime(self: Self) u32 {
+        return self.frame_delta_ms;
+    }
+
     // =========================================================================
     // ID Management
     // =========================================================================
@@ -589,3 +620,27 @@ test "Context focus groups" {
 
     ctx.endFrame();
 }
+
+test "Context timing" {
+    var ctx = try Context.init(std.testing.allocator, 800, 600);
+    defer ctx.deinit();
+
+    // Initially zero
+    try std.testing.expectEqual(@as(u64, 0), ctx.getTime());
+    try std.testing.expectEqual(@as(u32, 0), ctx.getDeltaTime());
+
+    // Set first frame time
+    ctx.setFrameTime(1000);
+    try std.testing.expectEqual(@as(u64, 1000), ctx.getTime());
+    try std.testing.expectEqual(@as(u32, 0), ctx.getDeltaTime()); // No delta on first frame
+
+    // Set second frame time
+    ctx.setFrameTime(1016); // ~60 FPS = 16ms per frame
+    try std.testing.expectEqual(@as(u64, 1016), ctx.getTime());
+    try std.testing.expectEqual(@as(u32, 16), ctx.getDeltaTime());
+
+    // Set third frame time with larger gap
+    ctx.setFrameTime(1116); // 100ms later
+    try std.testing.expectEqual(@as(u64, 1116), ctx.getTime());
+    try std.testing.expectEqual(@as(u32, 100), ctx.getDeltaTime());
+}

src/core/shortcuts.zig

@@ -44,7 +44,7 @@ pub const Modifiers = packed struct {
             .ctrl = input.keyDown(.left_ctrl) or input.keyDown(.right_ctrl),
             .shift = input.keyDown(.left_shift) or input.keyDown(.right_shift),
             .alt = input.keyDown(.left_alt) or input.keyDown(.right_alt),
-            .super = input.keyDown(.left_super) or input.keyDown(.right_super),
+            .super = input.modifiers.super, // Use tracked modifier state
         };
     }
 };
@@ -104,6 +104,48 @@ pub const Shortcut = struct {
     }
 };
 
+/// Standard shortcut IDs for quick checking without registration
+pub const StandardShortcut = enum {
+    select_all,
+    copy,
+    paste,
+    cut,
+    undo,
+    redo,
+    save,
+    new,
+    open,
+    close,
+    find,
+    quit,
+    help,
+    cancel,
+};
+
+/// Check if a standard shortcut is active (convenience function)
+/// Works without ShortcutManager - checks input directly
+pub fn isStandardActive(input: *const Input.InputState, shortcut: StandardShortcut) bool {
+    const mods = Modifiers.fromInput(input);
+
+    return switch (shortcut) {
+        .select_all => input.keyPressed(.a) and mods.eql(.{ .ctrl = true }),
+        .copy => input.keyPressed(.c) and mods.eql(.{ .ctrl = true }),
+        .paste => input.keyPressed(.v) and mods.eql(.{ .ctrl = true }),
+        .cut => input.keyPressed(.x) and mods.eql(.{ .ctrl = true }),
+        .undo => input.keyPressed(.z) and mods.eql(.{ .ctrl = true }),
+        .redo => (input.keyPressed(.z) and mods.eql(.{ .ctrl = true, .shift = true })) or
+            (input.keyPressed(.y) and mods.eql(.{ .ctrl = true })),
+        .save => input.keyPressed(.s) and mods.eql(.{ .ctrl = true }),
+        .new => input.keyPressed(.n) and mods.eql(.{ .ctrl = true }),
+        .open => input.keyPressed(.o) and mods.eql(.{ .ctrl = true }),
+        .close => input.keyPressed(.w) and mods.eql(.{ .ctrl = true }),
+        .find => input.keyPressed(.f) and mods.eql(.{ .ctrl = true }),
+        .quit => input.keyPressed(.q) and mods.eql(.{ .ctrl = true }),
+        .help => input.keyPressed(.f1) and mods.eql(.{}),
+        .cancel => input.keyPressed(.escape) and mods.eql(.{}),
+    };
+}
+
 /// Shortcut manager for registering and checking shortcuts
 pub const ShortcutManager = struct {
     shortcuts: [MAX_SHORTCUTS]Shortcut = undefined,
@@ -381,3 +423,17 @@ test "registerCommon" {
     try std.testing.expect(manager.getByAction("paste") != null);
     try std.testing.expect(manager.getByAction("undo") != null);
 }
+
+test "isStandardActive" {
+    var input = Input.InputState.init();
+
+    // Simulate Ctrl being held
+    input.keys_down[@intFromEnum(Input.Key.left_ctrl)] = true;
+
+    // Simulate 'a' key press this frame
+    input.keys_down[@intFromEnum(Input.Key.a)] = true;
+    input.keys_down_prev[@intFromEnum(Input.Key.a)] = false;
+
+    try std.testing.expect(isStandardActive(&input, .select_all));
+    try std.testing.expect(!isStandardActive(&input, .copy)); // 'c' not pressed
+}

src/widgets/table.zig

@@ -158,6 +158,8 @@ pub const TableResult = struct {
     validation_failed: bool = false,
     /// Validation error message
     validation_message: []const u8 = "",
+    /// Incremental search matched a row
+    search_matched: bool = false,
 };
 
 // =============================================================================
@@ -218,6 +220,15 @@ pub const TableState = struct {
     /// Length of last validation message
     last_validation_message_len: usize = 0,
 
+    /// Incremental search buffer
+    search_buffer: [64]u8 = [_]u8{0} ** 64,
+    /// Search buffer length
+    search_len: usize = 0,
+    /// Last search keypress time (for timeout reset)
+    search_last_time: u64 = 0,
+    /// Search timeout in ms (reset search after this)
+    search_timeout_ms: u64 = 1000,
+
     const Self = @This();
 
     /// Initialize table state
@@ -273,6 +284,34 @@ pub const TableState = struct {
         self.edit_state.focused = false;
     }
 
+    /// Add character to search buffer (for incremental search)
+    /// Returns the current search term
+    pub fn addSearchChar(self: *Self, char: u8, current_time: u64) []const u8 {
+        // Reset search if timeout expired
+        if (current_time > self.search_last_time + self.search_timeout_ms) {
+            self.search_len = 0;
+        }
+
+        // Add character if room
+        if (self.search_len < self.search_buffer.len) {
+            self.search_buffer[self.search_len] = char;
+            self.search_len += 1;
+        }
+
+        self.search_last_time = current_time;
+        return self.search_buffer[0..self.search_len];
+    }
+
+    /// Get current search term
+    pub fn getSearchTerm(self: Self) []const u8 {
+        return self.search_buffer[0..self.search_len];
+    }
+
+    /// Clear search buffer
+    pub fn clearSearch(self: *Self) void {
+        self.search_len = 0;
+    }
+
     /// Get edit text
     pub fn getEditText(self: *Self) []const u8 {
         return self.edit_state.text();
@@ -1397,6 +1436,86 @@ fn handleKeyboard(
             result.selection_changed = true;
         }
     }
+
+    // Incremental search (only when not editing and no modifiers pressed)
+    if (!state.editing and !ctx.input.modifiers.ctrl and !ctx.input.modifiers.alt) {
+        const text_in = ctx.input.getTextInput();
+        if (text_in.len > 0) {
+            // Add characters to search buffer
+            for (text_in) |char| {
+                if (char >= 32 and char < 127) { // Printable ASCII
+                    const search_term = state.addSearchChar(char, ctx.current_time_ms);
+
+                    // Search for matching row in first column (column 0)
+                    if (search_term.len > 0) {
+                        var found_row: ?usize = null;
+
+                        // Search from current position first, then wrap
+                        const start_row: usize = if (state.selected_row >= 0)
+                            @intCast(state.selected_row)
+                        else
+                            0;
+
+                        // Search from start_row to end
+                        var row: usize = start_row;
+                        while (row < state.row_count) : (row += 1) {
+                            const cell_text = get_cell(row, 0);
+                            if (startsWithIgnoreCase(cell_text, search_term)) {
+                                found_row = row;
+                                break;
+                            }
+                        }
+
+                        // If not found, wrap to beginning
+                        if (found_row == null and start_row > 0) {
+                            row = 0;
+                            while (row < start_row) : (row += 1) {
+                                const cell_text = get_cell(row, 0);
+                                if (startsWithIgnoreCase(cell_text, search_term)) {
+                                    found_row = row;
+                                    break;
+                                }
+                            }
+                        }
+
+                        // Move selection if found
+                        if (found_row) |row_idx| {
+                            state.selected_row = @intCast(row_idx);
+                            state.ensureVisible(visible_rows);
+                            result.selection_changed = true;
+                            result.search_matched = true;
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+
+// =============================================================================
+// Helper Functions
+// =============================================================================
+
+/// Case-insensitive prefix match for incremental search
+fn startsWithIgnoreCase(haystack: []const u8, needle: []const u8) bool {
+    if (needle.len > haystack.len) return false;
+    if (needle.len == 0) return true;
+
+    for (needle, 0..) |needle_char, i| {
+        const haystack_char = haystack[i];
+        // Simple ASCII case-insensitive comparison
+        const needle_lower = if (needle_char >= 'A' and needle_char <= 'Z')
+            needle_char + 32
+        else
+            needle_char;
+        const haystack_lower = if (haystack_char >= 'A' and haystack_char <= 'Z')
+            haystack_char + 32
+        else
+            haystack_char;
+
+        if (needle_lower != haystack_lower) return false;
+    }
+    return true;
 }
 
 // =============================================================================
@@ -1615,3 +1734,36 @@ test "TableState validation" {
     state.clearAllErrors();
     try std.testing.expect(!state.hasAnyErrors());
 }
+
+test "startsWithIgnoreCase" {
+    try std.testing.expect(startsWithIgnoreCase("Hello World", "hello"));
+    try std.testing.expect(startsWithIgnoreCase("Hello World", "HELLO"));
+    try std.testing.expect(startsWithIgnoreCase("Hello World", "Hello"));
+    try std.testing.expect(startsWithIgnoreCase("ABC", "abc"));
+    try std.testing.expect(startsWithIgnoreCase("abc", "ABC"));
+    try std.testing.expect(!startsWithIgnoreCase("Hello", "World"));
+    try std.testing.expect(!startsWithIgnoreCase("Hi", "Hello"));
+    try std.testing.expect(startsWithIgnoreCase("Test", ""));
+    try std.testing.expect(startsWithIgnoreCase("", ""));
+}
+
+test "TableState incremental search" {
+    var state = TableState.init();
+
+    // Add first char
+    const search1 = state.addSearchChar('a', 1000);
+    try std.testing.expectEqualStrings("a", search1);
+    try std.testing.expectEqualStrings("a", state.getSearchTerm());
+
+    // Add second char within timeout
+    const search2 = state.addSearchChar('b', 1500);
+    try std.testing.expectEqualStrings("ab", search2);
+
+    // Timeout resets search
+    const search3 = state.addSearchChar('c', 3000);
+    try std.testing.expectEqualStrings("c", search3);
+
+    // Clear search
+    state.clearSearch();
+    try std.testing.expectEqualStrings("", state.getSearchTerm());
+}

src/widgets/text_input.zig

@@ -9,6 +9,7 @@ const Command = @import("../core/command.zig");
 const Layout = @import("../core/layout.zig");
 const Style = @import("../core/style.zig");
 const Input = @import("../core/input.zig");
+const shortcuts = @import("../core/shortcuts.zig");
 
 /// Text input state (caller-managed)
 pub const TextInputState = struct {
@@ -310,17 +311,16 @@ pub fn textInputRect(
                     .enter => {
                         result.submitted = true;
                     },
-                    .a => {
-                        // Ctrl+A = Select All
-                        if (key_event.modifiers.ctrl) {
-                            state.selectAll();
-                        }
-                    },
                     else => {},
                 }
             }
         }
 
+        // Check standard shortcuts using centralized system
+        if (shortcuts.isStandardActive(&ctx.input, .select_all)) {
+            state.selectAll();
+        }
+
         // Handle typed text
         const text_in = ctx.input.getTextInput();
         if (text_in.len > 0) {
@@ -351,8 +351,16 @@ pub fn textInputRect(
         ctx.pushCommand(Command.text(inner.x, text_y, display_text, display_color));
     }
 
-    // Draw cursor if focused
+    // Draw cursor if focused (blinking every 500ms)
     if (has_focus and !config.readonly) {
+        // Cursor blinks: visible for 500ms, hidden for 500ms
+        const blink_period_ms: u64 = 500;
+        const cursor_visible = if (ctx.current_time_ms > 0)
+            (ctx.current_time_ms / blink_period_ms) % 2 == 0
+        else
+            true; // Always visible if no timing available
+
+        if (cursor_visible) {
             const char_width: u32 = 8;
             const cursor_x = inner.x + @as(i32, @intCast(state.cursor * char_width));
             const cursor_color = theme.foreground;
@@ -365,6 +373,7 @@ pub fn textInputRect(
                 cursor_color,
             ));
         }
+    }
 
     // Draw selection if any
     if (state.selection_start) |sel_start| {