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

@@ -751,6 +751,45 @@ func (c *Client) PostComment(ctx context.Context, token, owner, repo string, ind
 	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/handlers/handlers.go

@@ -367,6 +367,17 @@ 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 {
@@ -377,12 +388,14 @@ 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,
 	}
@@ -418,6 +431,17 @@ 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 {
@@ -427,11 +451,13 @@ 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

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>