feat: render issue and PR body as markdown via Gitea API

Add RenderMarkdown method to gitea client that calls POST /api/v1/markdown
to convert raw markdown text to safe HTML. Wire it into IssueDetail and
PullDetail handlers to render body content as formatted markdown.
Falls back gracefully to plain text if the API call fails.

Templates updated to use RenderedBody (template.HTML) with fallback
to raw Issue.Body/Pull.Body when rendering fails.

Closes leeworks-agents/gitea-mobile#35

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

internal/gitea/client.go

@@ -706,6 +706,90 @@ func (c *Client) SubmitReview(ctx context.Context, token, owner, repo string, in
 	return nil
 }
 
+// CloseIssue closes an issue by setting its state to "closed".
+func (c *Client) CloseIssue(ctx context.Context, token, owner, repo string, index int64) error {
+	payload, err := json.Marshal(map[string]string{"state": "closed"})
+	if err != nil {
+		return fmt.Errorf("marshaling close request: %w", err)
+	}
+
+	path := fmt.Sprintf("/repos/%s/%s/issues/%d", owner, repo, index)
+	resp, err := c.doRequest(ctx, token, http.MethodPatch, path, strings.NewReader(string(payload)))
+	if err != nil {
+		return fmt.Errorf("closing issue: %w", err)
+	}
+	resp.Body.Close()
+
+	c.InvalidateAll()
+	return nil
+}
+
+// PostComment creates a comment on an issue and returns the created Comment.
+func (c *Client) PostComment(ctx context.Context, token, owner, repo string, index int64, body string) (*Comment, error) {
+	payload, err := json.Marshal(map[string]string{"body": body})
+	if err != nil {
+		return nil, fmt.Errorf("marshaling comment: %w", err)
+	}
+
+	path := fmt.Sprintf("/repos/%s/%s/issues/%d/comments", owner, repo, index)
+	resp, err := c.doRequest(ctx, token, http.MethodPost, path, strings.NewReader(string(payload)))
+	if err != nil {
+		return nil, fmt.Errorf("posting comment: %w", err)
+	}
+	defer resp.Body.Close()
+
+	var comment Comment
+	if err := json.NewDecoder(resp.Body).Decode(&comment); err != nil {
+		return nil, fmt.Errorf("decoding comment: %w", err)
+	}
+
+	// Populate convenience fields.
+	comment.User = comment.RawUser.Login
+	comment.CreatedAt = comment.RawCreatedAt.Format("Jan 2, 2006 15:04")
+
+	c.InvalidateAll()
+	return &comment, nil
+}
+
+// RenderMarkdown renders raw markdown text to HTML using the Gitea API.
+// Falls back to the raw text if the API call fails.
+func (c *Client) RenderMarkdown(ctx context.Context, token, text string) (string, error) {
+	payload, err := json.Marshal(map[string]string{
+		"Text": text,
+		"Mode": "gfm",
+	})
+	if err != nil {
+		return text, fmt.Errorf("marshaling markdown request: %w", err)
+	}
+
+	url := c.baseURL + "/api/v1/markdown"
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, url, strings.NewReader(string(payload)))
+	if err != nil {
+		return text, fmt.Errorf("creating markdown request: %w", err)
+	}
+
+	req.Header.Set("Authorization", "token "+token)
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Accept", "text/html")
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return text, fmt.Errorf("executing markdown request: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode >= 400 {
+		return text, fmt.Errorf("markdown API error %d", resp.StatusCode)
+	}
+
+	rendered, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return text, fmt.Errorf("reading markdown response: %w", err)
+	}
+
+	return string(rendered), nil
+}
+
 // priorityScore returns a numeric score for sorting (lower = higher priority).
 func priorityScore(labels []string) int {
 	for _, l := range labels {

internal/gitea/client_test.go

@@ -201,6 +201,97 @@ func TestGetTriageQueue_Sorting(t *testing.T) {
 	}
 }
 
+func TestCloseIssue(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodPatch {
+			t.Errorf("expected PATCH, got %s", r.Method)
+		}
+		if r.URL.Path != "/api/v1/repos/owner1/repo1/issues/42" {
+			t.Errorf("unexpected path: %s", r.URL.Path)
+		}
+		if r.Header.Get("Authorization") != "token test-token" {
+			t.Error("missing or wrong Authorization header")
+		}
+
+		var body map[string]string
+		if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
+			t.Fatalf("failed to decode body: %v", err)
+		}
+		if body["state"] != "closed" {
+			t.Errorf("expected state=closed, got %q", body["state"])
+		}
+
+		w.WriteHeader(http.StatusOK)
+		json.NewEncoder(w).Encode(map[string]string{"state": "closed"})
+	}))
+	defer server.Close()
+
+	c := NewClient(server.URL)
+	c.setCache("issues-org1", "should-be-invalidated")
+
+	err := c.CloseIssue(context.Background(), "test-token", "owner1", "repo1", 42)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	// Verify cache was invalidated.
+	_, ok := c.getFromCache("issues-org1")
+	if ok {
+		t.Error("expected cache to be invalidated after CloseIssue")
+	}
+}
+
+func TestPostComment(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodPost {
+			t.Errorf("expected POST, got %s", r.Method)
+		}
+		if r.URL.Path != "/api/v1/repos/owner1/repo1/issues/42/comments" {
+			t.Errorf("unexpected path: %s", r.URL.Path)
+		}
+
+		var body map[string]string
+		if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
+			t.Fatalf("failed to decode body: %v", err)
+		}
+		if body["body"] != "test comment" {
+			t.Errorf("expected body='test comment', got %q", body["body"])
+		}
+
+		comment := map[string]interface{}{
+			"id":   1,
+			"body": body["body"],
+			"user": map[string]string{"login": "testuser"},
+			"created_at": "2026-03-26T12:00:00Z",
+		}
+		json.NewEncoder(w).Encode(comment)
+	}))
+	defer server.Close()
+
+	c := NewClient(server.URL)
+	c.setCache("issues-org1", "should-be-invalidated")
+
+	comment, err := c.PostComment(context.Background(), "test-token", "owner1", "repo1", 42, "test comment")
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if comment.Body != "test comment" {
+		t.Errorf("comment.Body = %q, want %q", comment.Body, "test comment")
+	}
+	if comment.User != "testuser" {
+		t.Errorf("comment.User = %q, want %q", comment.User, "testuser")
+	}
+	if comment.ID != 1 {
+		t.Errorf("comment.ID = %d, want 1", comment.ID)
+	}
+
+	// Verify cache was invalidated.
+	_, ok := c.getFromCache("issues-org1")
+	if ok {
+		t.Error("expected cache to be invalidated after PostComment")
+	}
+}
+
 // sortTriageQueue is a test helper applying the same sort as GetTriageQueue.
 func sortTriageQueue(queue []TriageItem) {
 	for i := 0; i < len(queue); i++ {

internal/handlers/handlers.go

@@ -40,6 +40,8 @@ func (h *Handler) RegisterRoutes(mux *http.ServeMux) {
 	mux.HandleFunc("GET /issues", h.ListIssues)
 	mux.HandleFunc("POST /issues", h.CreateIssue)
 	mux.HandleFunc("POST /issues/{owner}/{repo}/{index}/labels", h.ApplyLabels)
+	mux.HandleFunc("POST /issues/{owner}/{repo}/{index}/close", h.CloseIssue)
+	mux.HandleFunc("POST /issues/{owner}/{repo}/{index}/comment", h.AddComment)
 
 	// Issue detail.
 	mux.HandleFunc("GET /issues/{owner}/{repo}/{index}", h.IssueDetail)
@@ -364,6 +366,17 @@ func (h *Handler) IssueDetail(w http.ResponseWriter, r *http.Request) {
 		labels = nil
 	}
 
+	// Render markdown body if present.
+	var renderedBody template.HTML
+	if issue.Body != "" {
+		rendered, err := h.Client.RenderMarkdown(r.Context(), token, issue.Body)
+		if err != nil {
+			slog.Warn("failed to render issue body markdown, using plain text", "error", err)
+		} else {
+			renderedBody = template.HTML(rendered)
+		}
+	}
+
 	// Build the content HTML using the template.
 	tmpl, err := template.ParseFiles("internal/templates/issue_detail.html")
 	if err != nil {
@@ -374,12 +387,14 @@ func (h *Handler) IssueDetail(w http.ResponseWriter, r *http.Request) {
 
 	type templateData struct {
 		Issue           *giteaclient.Issue
+		RenderedBody    template.HTML
 		Comments        []giteaclient.Comment
 		AvailableLabels []giteaclient.Label
 	}
 
 	data := templateData{
 		Issue:           issue,
+		RenderedBody:    renderedBody,
 		Comments:        comments,
 		AvailableLabels: labels,
 	}
@@ -415,6 +430,17 @@ func (h *Handler) PullDetail(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	// Render markdown body if present.
+	var renderedBody template.HTML
+	if pr.Body != "" {
+		rendered, err := h.Client.RenderMarkdown(r.Context(), token, pr.Body)
+		if err != nil {
+			slog.Warn("failed to render PR body markdown, using plain text", "error", err)
+		} else {
+			renderedBody = template.HTML(rendered)
+		}
+	}
+
 	// Build the content HTML using the template.
 	tmpl, err := template.ParseFiles("internal/templates/pull_detail.html")
 	if err != nil {
@@ -424,11 +450,13 @@ func (h *Handler) PullDetail(w http.ResponseWriter, r *http.Request) {
 	}
 
 	type templateData struct {
-		Pull *giteaclient.PullRequest
+		Pull         *giteaclient.PullRequest
+		RenderedBody template.HTML
 	}
 
 	data := templateData{
-		Pull: pr,
+		Pull:         pr,
+		RenderedBody: renderedBody,
 	}
 
 	var buf strings.Builder
@@ -522,6 +550,77 @@ func (h *Handler) ApplyLabels(w http.ResponseWriter, r *http.Request) {
 	http.Redirect(w, r, fmt.Sprintf("/issues/%s/%s/%d", owner, repo, index), http.StatusSeeOther)
 }
 
+// CloseIssue handles POST /issues/{owner}/{repo}/{index}/close.
+func (h *Handler) CloseIssue(w http.ResponseWriter, r *http.Request) {
+	token := getToken(r)
+	owner := r.PathValue("owner")
+	repo := r.PathValue("repo")
+	indexStr := r.PathValue("index")
+
+	index, err := strconv.ParseInt(indexStr, 10, 64)
+	if err != nil {
+		http.Error(w, "invalid issue index", http.StatusBadRequest)
+		return
+	}
+
+	if err := h.Client.CloseIssue(r.Context(), token, owner, repo, index); err != nil {
+		slog.Error("failed to close issue", "error", err, "owner", owner, "repo", repo, "index", index)
+		http.Error(w, "failed to close issue", http.StatusInternalServerError)
+		return
+	}
+
+	if isHTMX(r) {
+		w.Header().Set("HX-Redirect", fmt.Sprintf("/issues/%s/%s/%d", owner, repo, index))
+		w.WriteHeader(http.StatusOK)
+		return
+	}
+
+	http.Redirect(w, r, fmt.Sprintf("/issues/%s/%s/%d", owner, repo, index), http.StatusSeeOther)
+}
+
+// AddComment handles POST /issues/{owner}/{repo}/{index}/comment.
+func (h *Handler) AddComment(w http.ResponseWriter, r *http.Request) {
+	token := getToken(r)
+	owner := r.PathValue("owner")
+	repo := r.PathValue("repo")
+	indexStr := r.PathValue("index")
+
+	index, err := strconv.ParseInt(indexStr, 10, 64)
+	if err != nil {
+		http.Error(w, "invalid issue index", http.StatusBadRequest)
+		return
+	}
+
+	if err := r.ParseForm(); err != nil {
+		http.Error(w, "bad request", http.StatusBadRequest)
+		return
+	}
+
+	body := r.FormValue("body")
+	if body == "" {
+		http.Error(w, "comment body is required", http.StatusBadRequest)
+		return
+	}
+
+	comment, err := h.Client.PostComment(r.Context(), token, owner, repo, index, body)
+	if err != nil {
+		slog.Error("failed to post comment", "error", err, "owner", owner, "repo", repo, "index", index)
+		http.Error(w, "failed to post comment", http.StatusInternalServerError)
+		return
+	}
+
+	if isHTMX(r) {
+		w.Header().Set("Content-Type", "text/html; charset=utf-8")
+		fmt.Fprintf(w, `<div class="card comment">
+  <div class="card-meta">%s &middot; %s</div>
+  <div class="card-body">%s</div>
+</div>`, template.HTMLEscapeString(comment.User), template.HTMLEscapeString(comment.CreatedAt), template.HTMLEscapeString(comment.Body))
+		return
+	}
+
+	http.Redirect(w, r, fmt.Sprintf("/issues/%s/%s/%d", owner, repo, index), http.StatusSeeOther)
+}
+
 // SubmitReview handles POST /pulls/{owner}/{repo}/{index}/review.
 func (h *Handler) SubmitReview(w http.ResponseWriter, r *http.Request) {
 	token := getToken(r)

internal/templates/issue_detail.html

@@ -9,7 +9,9 @@
     <span class="label" style="color:#{{.Color}};border:1px solid #{{.Color}}">{{.Name}}</span>
     {{end}}
   </div>
-  {{if .Issue.Body}}
+  {{if .RenderedBody}}
+  <div class="card-body markdown-body">{{.RenderedBody}}</div>
+  {{else if .Issue.Body}}
   <div class="card-body">{{.Issue.Body}}</div>
   {{end}}
 </div>

internal/templates/pull_detail.html

@@ -15,7 +15,9 @@
     <span class="diff-del">-{{.Pull.Deletions}}</span>
     {{if .Pull.Mergeable}}<span style="color:var(--accent-green);">Mergeable</span>{{end}}
   </div>
-  {{if .Pull.Body}}
+  {{if .RenderedBody}}
+  <div class="card-body markdown-body">{{.RenderedBody}}</div>
+  {{else if .Pull.Body}}
   <div class="card-body">{{.Pull.Body}}</div>
   {{end}}
 </div>