feat(cli): integrate ProgressBar into sync command

Update progress.zig and integrate into sync command:
- progress.zig: update import from colors.zig to io.zig
- sync.zig: add ProgressBar for multi-run sync operations
- Shows progress bar when syncing 2+ runs (not in JSON mode)
- Updates progress after each successful sync

Benefits:
- Better UX for long-running sync operations
- Visual feedback on sync progress
- Maintains clean output for single runs

All tests pass.

cli/src/commands/sync.zig

@@ -6,6 +6,7 @@ const crypto = @import("../utils/crypto.zig");
 const mode = @import("../mode.zig");
 const core = @import("../core.zig");
 const manifest_lib = @import("../manifest.zig");
+const progress = @import("../utils/progress.zig");
 
 pub fn run(allocator: std.mem.Allocator, args: []const []const u8) !void {
     var flags = core.flags.CommonFlags{};
@@ -82,8 +83,20 @@ pub fn run(allocator: std.mem.Allocator, args: []const []const u8) !void {
     defer client.close();
 
     var success_count: usize = 0;
-    for (runs_to_sync.items) |run_info| {
-        if (!flags.json) std.debug.print("Syncing run {s}...\n", .{run_info.run_id[0..8]});
+
+    // Show progress bar for multiple runs (not in JSON mode)
+    var pb: ?progress.ProgressBar = null;
+    if (!flags.json and runs_to_sync.items.len > 1) {
+        pb = progress.ProgressBar.init(allocator, runs_to_sync.items.len, "Syncing runs...");
+    }
+    defer if (pb) |*p| p.finish();
+
+    for (runs_to_sync.items, 0..) |run_info, idx| {
+        if (!flags.json) {
+            if (runs_to_sync.items.len == 1) {
+                std.debug.print("Syncing run {s}...\n", .{run_info.run_id[0..8]});
+            }
+        }
         syncRun(allocator, &database, &client, run_info, api_key_hash) catch |err| {
             if (!flags.json) std.debug.print("Failed to sync run {s}: {}\n", .{ run_info.run_id[0..8], err });
             continue;
@@ -94,6 +107,9 @@ pub fn run(allocator: std.mem.Allocator, args: []const []const u8) !void {
         try db.DB.bindText(update_stmt, 1, run_info.run_id);
         _ = try db.DB.step(update_stmt);
         success_count += 1;
+
+        // Update progress bar
+        if (pb) |*p| p.update(idx + 1);
     }
 
     database.checkpointOnExit();

cli/src/utils/progress.zig

@@ -1,5 +1,5 @@
 const std = @import("std");
-const colors = @import("colors.zig");
+const io = @import("io.zig");
 
 /// Progress bar for long-running operations
 pub const ProgressBar = struct {