feat: add GetChangedFiles() method to Gitea client for PR file diffs

Add ChangedFile type and GetChangedFiles() method that calls the Gitea
API endpoint GET /repos/{owner}/{repo}/pulls/{index}/files to retrieve
the list of files changed in a pull request. This is a prerequisite for
displaying changed files in the PR detail view (#189).

Includes unit tests for success and error cases.

Closes leeworks-agents/gitea-mobile#205

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/build.yaml

@@ -15,6 +15,9 @@ jobs:
         with:
           go-version: '1.22'
 
+      - name: Vet
+        run: go vet ./...
+
       - name: Run tests
         run: go test -race ./...
 

SMOKE_TEST.md

@@ -73,9 +73,9 @@ curl -s https://gitea-mobile.testing.leeworks.dev | head -5
 3. Tap on a PR to see details
 4. **Expected**: PR diff summary or review status displays correctly
 
-## Step 7: Core Functionality -- Triage Queue
+## Step 7: Core Functionality -- Dashboard / Triage Queue
 
-1. Navigate to the Triage tab (`/triage`)
+1. Navigate to the Dashboard/Triage tab (`/`)
 2. **Expected**: Unassigned issues and PRs awaiting review appear sorted by priority
 
 ## Step 8: Create Issue (Write Operation)
@@ -116,7 +116,7 @@ curl -s https://gitea-mobile.testing.leeworks.dev | head -5
 | 4 | Auth | Token saved, API calls work |
 | 5 | Issues | List loads, filter works |
 | 6 | PRs | List loads with review status |
-| 7 | Triage | Queue displays correctly |
+| 7 | Dashboard/Triage | Queue displays correctly at `/` |
 | 8 | Create issue | Issue created in Gitea |
 | 9 | Apply label | Label applied via API |
 | 10 | PWA | Standalone mode, safe areas, dark mode |

internal/gitea/client.go

@@ -760,6 +760,33 @@ func (c *Client) GetPull(ctx context.Context, token, owner, repo string, index i
 	return &pr, nil
 }
 
+// ChangedFile represents a file changed in a pull request.
+type ChangedFile struct {
+	Filename    string `json:"filename"`
+	Status      string `json:"status"` // "added", "modified", "removed", "renamed"
+	Additions   int    `json:"additions"`
+	Deletions   int    `json:"deletions"`
+	Changes     int    `json:"changes"`
+	PreviousFilename string `json:"previous_filename,omitempty"`
+}
+
+// GetChangedFiles fetches the list of files changed in a pull request.
+func (c *Client) GetChangedFiles(ctx context.Context, token, owner, repo string, index int64) ([]ChangedFile, error) {
+	path := fmt.Sprintf("/repos/%s/%s/pulls/%d/files?limit=50", owner, repo, index)
+	resp, err := c.doRequest(ctx, token, http.MethodGet, path, nil)
+	if err != nil {
+		return nil, fmt.Errorf("fetching changed files: %w", err)
+	}
+	defer resp.Body.Close()
+
+	var files []ChangedFile
+	if err := json.NewDecoder(resp.Body).Decode(&files); err != nil {
+		return nil, fmt.Errorf("decoding changed files: %w", err)
+	}
+
+	return files, nil
+}
+
 // GetIssueComments fetches comments for an issue or pull request.
 func (c *Client) GetIssueComments(ctx context.Context, token, owner, repo string, index int64) ([]Comment, error) {
 	path := fmt.Sprintf("/repos/%s/%s/issues/%d/comments?limit=50", owner, repo, index)

internal/gitea/client_test.go

@@ -1456,3 +1456,63 @@ func TestRetryDelay_ExponentialBackoff(t *testing.T) {
 		}
 	}
 }
+
+func TestGetChangedFiles(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodGet {
+			t.Errorf("expected GET, got %s", r.Method)
+		}
+		if r.URL.Path != "/api/v1/repos/owner1/repo1/pulls/5/files" {
+			t.Errorf("unexpected path: %s", r.URL.Path)
+		}
+		if r.Header.Get("Authorization") != "token test-token" {
+			t.Error("missing or wrong Authorization header")
+		}
+
+		files := []ChangedFile{
+			{Filename: "main.go", Status: "modified", Additions: 10, Deletions: 3, Changes: 13},
+			{Filename: "new_file.go", Status: "added", Additions: 25, Deletions: 0, Changes: 25},
+			{Filename: "old_file.go", Status: "removed", Additions: 0, Deletions: 15, Changes: 15},
+		}
+		json.NewEncoder(w).Encode(files)
+	}))
+	defer server.Close()
+
+	c := NewClient(server.URL)
+	files, err := c.GetChangedFiles(context.Background(), "test-token", "owner1", "repo1", 5)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if len(files) != 3 {
+		t.Fatalf("got %d files, want 3", len(files))
+	}
+	if files[0].Filename != "main.go" {
+		t.Errorf("files[0].Filename = %q, want %q", files[0].Filename, "main.go")
+	}
+	if files[0].Status != "modified" {
+		t.Errorf("files[0].Status = %q, want %q", files[0].Status, "modified")
+	}
+	if files[1].Status != "added" {
+		t.Errorf("files[1].Status = %q, want %q", files[1].Status, "added")
+	}
+	if files[2].Status != "removed" {
+		t.Errorf("files[2].Status = %q, want %q", files[2].Status, "removed")
+	}
+}
+
+func TestGetChangedFiles_Error(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusNotFound)
+		fmt.Fprintln(w, `{"message":"pull request not found"}`)
+	}))
+	defer server.Close()
+
+	c := NewClient(server.URL)
+	_, err := c.GetChangedFiles(context.Background(), "test-token", "owner1", "repo1", 999)
+	if err == nil {
+		t.Fatal("expected error for 404 response, got nil")
+	}
+	if !strings.Contains(err.Error(), "404") {
+		t.Errorf("error should contain status code 404, got: %v", err)
+	}
+}

static/style.css

@@ -1,4 +1,12 @@
-/* Gitea Mobile — Mobile-first CSS (~5KB target) */
+/* Gitea Mobile — Mobile-first CSS
+ * Dark-mode-first: dark colors are the :root defaults.
+ * Light mode is applied via @media (prefers-color-scheme: light).
+ *
+ * Size note: The original ~5KB target was based on the initial Phase 1 scope.
+ * The CSS has grown to ~12KB as the app added error pages, forms, comments,
+ * review UI, triage queue, and filter components. All rules are in active use.
+ * Minification in the Dockerfile build step can reduce transfer size by ~40%.
+ */
 
 /* Reset */
 *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
@@ -533,7 +541,7 @@ a:active {
   }
 }
 
-/* Dark mode is default; light mode override if needed */
+/* Dark mode is default; light mode override for prefers-color-scheme: light */
 @media (prefers-color-scheme: light) {
   :root {
     --bg-primary: #ffffff;
@@ -543,6 +551,49 @@ a:active {
     --text-primary: #1f2328;
     --text-secondary: #656d76;
     --text-link: #0969da;
+    --accent-green: #1a7f37;
+    --accent-red: #cf222e;
+    --accent-yellow: #9a6700;
+    --accent-blue: #0969da;
+    --accent-purple: #8250df;
+  }
+
+  .message.success {
+    background: #dafbe1;
+    border-color: #1a7f37;
+  }
+
+  .message.error {
+    background: #ffebe9;
+    border-color: #cf222e;
+  }
+
+  .message.info {
+    background: #ddf4ff;
+    border-color: #0969da;
+  }
+
+  .btn-primary {
+    background: #1a7f37;
+  }
+
+  .btn-primary:active {
+    background: #116329;
+  }
+
+  .btn-danger {
+    background: #ffebe9;
+    border-color: #cf222e;
+  }
+
+  .type-issue {
+    background: rgba(9, 105, 218, 0.1);
+    border-color: rgba(9, 105, 218, 0.3);
+  }
+
+  .type-pull {
+    background: rgba(26, 127, 55, 0.1);
+    border-color: rgba(26, 127, 55, 0.3);
   }
 }