feat(ui): add maintenance page for task management

* Implement maintenance page with task and log display
* Add backfill and metadata retry functionality
* Integrate grid component for project display in thoughts page
* Update types for maintenance tasks and logs
* Enhance sidebar and shell for new maintenance navigation

internal/tools/learnings_test.go

@@ -0,0 +1,70 @@
+package tools
+
+import (
+	"context"
+	"testing"
+
+	"git.warky.dev/wdevs/amcs/internal/mcperrors"
+	"github.com/google/uuid"
+)
+
+func TestLearningsAddRequiresSummary(t *testing.T) {
+	tool := &LearningsTool{}
+
+	_, _, err := tool.Add(context.Background(), nil, AddLearningInput{})
+	if err == nil {
+		t.Fatal("Add() error = nil, want error")
+	}
+
+	_, data := requireRPCError(t, err)
+	if data.Field != "summary" {
+		t.Fatalf("Add() error field = %q, want %q", data.Field, "summary")
+	}
+}
+
+func TestLearningsMethodsRequireConfiguredStore(t *testing.T) {
+	tool := &LearningsTool{}
+
+	t.Run("add", func(t *testing.T) {
+		_, _, err := tool.Add(context.Background(), nil, AddLearningInput{Summary: "Keep this"})
+		if err == nil {
+			t.Fatal("Add() error = nil, want error")
+		}
+		_, data := requireRPCError(t, err)
+		if data.Type != mcperrors.TypeInvalidInput {
+			t.Fatalf("Add() data.type = %q, want %q", data.Type, mcperrors.TypeInvalidInput)
+		}
+	})
+
+	t.Run("get", func(t *testing.T) {
+		_, _, err := tool.Get(context.Background(), nil, GetLearningInput{ID: uuid.New()})
+		if err == nil {
+			t.Fatal("Get() error = nil, want error")
+		}
+		_, data := requireRPCError(t, err)
+		if data.Type != mcperrors.TypeInvalidInput {
+			t.Fatalf("Get() data.type = %q, want %q", data.Type, mcperrors.TypeInvalidInput)
+		}
+	})
+
+	t.Run("list", func(t *testing.T) {
+		_, _, err := tool.List(context.Background(), nil, ListLearningsInput{})
+		if err == nil {
+			t.Fatal("List() error = nil, want error")
+		}
+		_, data := requireRPCError(t, err)
+		if data.Type != mcperrors.TypeInvalidInput {
+			t.Fatalf("List() data.type = %q, want %q", data.Type, mcperrors.TypeInvalidInput)
+		}
+	})
+}
+
+func TestNormalizeStringSliceTrimsDedupesAndDropsEmpties(t *testing.T) {
+	got := normalizeStringSlice([]string{" alpha ", "beta", "", "beta", "alpha"})
+	if len(got) != 2 {
+		t.Fatalf("normalizeStringSlice() len = %d, want 2", len(got))
+	}
+	if got[0] != "alpha" || got[1] != "beta" {
+		t.Fatalf("normalizeStringSlice() = %#v, want [alpha beta]", got)
+	}
+}