feat: add external editor support for description editing in detail viewv0.9.1

- Enable editing task description using external editor ($EDITOR)
- Create temporary file for editing and handle TUI editor properly
- Show editing indicator while external editor is active
- Add blinking feedback after successful description update
- Increment version from 0.9.0 to 0.9.1

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

5 files changed, 124 insertions, 10 deletions

diff --git a/internal/ui/handlers.go b/internal/ui/handlers.go
index 3be357a..576519c 100644
--- a/internal/ui/handlers.go
+++ b/internal/ui/handlers.go
@@ -686,6 +686,17 @@ func (m *Model) handleDetailFieldEdit() (tea.Model, tea.Cmd) {
 		fieldPos++
 	}
 	
-	// Description and Annotations are not in the editable list
+	// Description (9)
+	if m.detailFieldIndex == fieldPos {
+		// Launch external editor for description
+		m.detailDescEditing = true
+		desc := ""
+		if m.currentTaskDetail != nil {
+			desc = m.currentTaskDetail.Description
+		}
+		return m, editDescriptionCmd(desc)
+	}
+	
+	// Annotations are not editable in detail view
 	return m, nil
 }
\ No newline at end of file
diff --git a/internal/ui/table.go b/internal/ui/table.go
index cb9d13d..74d5440 100644
--- a/internal/ui/table.go
+++ b/internal/ui/table.go
@@ -3,6 +3,8 @@ package ui
 import (
 	"fmt"
 	"math/rand"
+	"os"
+	"os/exec"
 	"regexp"
 	"strconv"
 	"strings"
@@ -127,15 +129,23 @@ type Model struct {
 	detailSearching   bool
 	detailSearchInput textinput.Model
 	detailSearchRegex *regexp.Regexp
-	detailFieldIndex  int  // Current selected field in detail view
-	detailBlinkField  int  // Field that is currently blinking (-1 for none)
-	detailBlinkOn     bool // Whether the blink is currently on
-	detailBlinkCount  int  // Number of blinks remaining
+	detailFieldIndex  int    // Current selected field in detail view
+	detailBlinkField  int    // Field that is currently blinking (-1 for none)
+	detailBlinkOn     bool   // Whether the blink is currently on
+	detailBlinkCount  int    // Number of blinks remaining
+	detailDescEditing bool   // Whether we're editing description in detail view
+	detailDescTempFile string // Temp file path for description editing
 }
 
 // editDoneMsg is emitted when the external editor process finishes.
 type editDoneMsg struct{ err error }
 
+// descEditDoneMsg is emitted when the external editor for description finishes.
+type descEditDoneMsg struct{ 
+	err error
+	tempFile string
+}
+
 type blinkMsg struct{}
 
 // blinkInterval controls how quickly the row flashes when a task changes.
@@ -153,6 +163,43 @@ func editCmd(id int) tea.Cmd {
 	return tea.ExecProcess(c, func(err error) tea.Msg { return editDoneMsg{err: err} })
 }
 
+// editDescriptionCmd returns a command that opens the description in external editor
+func editDescriptionCmd(description string) tea.Cmd {
+	return func() tea.Msg {
+		// Create temp file
+		tmpFile, err := os.CreateTemp("", "tasksamurai-desc-*.txt")
+		if err != nil {
+			return descEditDoneMsg{err: err, tempFile: ""}
+		}
+		tmpPath := tmpFile.Name()
+		
+		// Write current description to temp file
+		_, err = tmpFile.WriteString(description)
+		tmpFile.Close()
+		if err != nil {
+			os.Remove(tmpPath)
+			return descEditDoneMsg{err: err, tempFile: ""}
+		}
+		
+		// Get editor from environment
+		editor := os.Getenv("EDITOR")
+		if editor == "" {
+			editor = "vi" // fallback to vi
+		}
+		
+		// Create the command
+		c := exec.Command(editor, tmpPath)
+		c.Stdin = os.Stdin
+		c.Stdout = os.Stdout
+		c.Stderr = os.Stderr
+		
+		// Use ExecProcess to properly handle the external TUI editor
+		return tea.ExecProcess(c, func(err error) tea.Msg {
+			return descEditDoneMsg{err: err, tempFile: tmpPath}
+		})()
+	}
+}
+
 func blinkCmd() tea.Cmd {
 	return tea.Tick(blinkInterval, func(time.Time) tea.Msg { return blinkMsg{} })
 }
@@ -335,6 +382,8 @@ func (m *Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		return m.handleWindowResize(msg)
 	case editDoneMsg:
 		return m.handleEditDone(msg)
+	case descEditDoneMsg:
+		return m.handleDescEditDone(msg)
 	case blinkMsg:
 		return m.handleBlinkMsg()
 	case struct{ clearStatus bool }:
@@ -397,6 +446,49 @@ func (m *Model) handleEditDone(msg editDoneMsg) (tea.Model, tea.Cmd) {
 	return m, cmd
 }
 
+// handleDescEditDone handles the completion of description editing
+func (m *Model) handleDescEditDone(msg descEditDoneMsg) (tea.Model, tea.Cmd) {
+	m.detailDescEditing = false
+	defer os.Remove(msg.tempFile) // Clean up temp file
+	
+	if msg.err != nil {
+		m.statusMsg = fmt.Sprintf("Edit error: %v", msg.err)
+		cmd := tea.Tick(2*time.Second, func(time.Time) tea.Msg {
+			return struct{ clearStatus bool }{true}
+		})
+		return m, cmd
+	}
+	
+	// Read the edited content
+	content, err := os.ReadFile(msg.tempFile)
+	if err != nil {
+		m.statusMsg = fmt.Sprintf("Error reading file: %v", err)
+		cmd := tea.Tick(2*time.Second, func(time.Time) tea.Msg {
+			return struct{ clearStatus bool }{true}
+		})
+		return m, cmd
+	}
+	
+	// Update the description
+	newDesc := strings.TrimSpace(string(content))
+	if m.currentTaskDetail != nil {
+		err = task.SetDescription(m.currentTaskDetail.ID, newDesc)
+		if err != nil {
+			m.statusMsg = fmt.Sprintf("Error updating description: %v", err)
+			cmd := tea.Tick(2*time.Second, func(time.Time) tea.Msg {
+				return struct{ clearStatus bool }{true}
+			})
+			return m, cmd
+		}
+		
+		// Reload and start blinking
+		m.reload()
+		return m, m.startDetailBlink(9) // Description field index
+	}
+	
+	return m, nil
+}
+
 // handleBlinkMsg handles the blinking animation timer
 func (m *Model) handleBlinkMsg() (tea.Model, tea.Cmd) {
 	// Handle detail view blinking
diff --git a/internal/ui/taskdetail.go b/internal/ui/taskdetail.go
index 9d68e4f..70c06a0 100644
--- a/internal/ui/taskdetail.go
+++ b/internal/ui/taskdetail.go
@@ -141,12 +141,23 @@ func (m *Model) renderTaskDetail() string {
 	lines = append(lines, "")
 	descLabelStyle := labelStyle.Copy()
 	descValueStyle := descStyle.Copy()
-	if m.detailFieldIndex == currentField {
+	// Apply blinking if this field is blinking
+	if m.detailBlinkField == currentField && m.detailBlinkOn {
+		blinkBG := lipgloss.Color("226") // Bright yellow
+		descLabelStyle = descLabelStyle.Background(blinkBG).Foreground(lipgloss.Color("0"))
+		descValueStyle = descValueStyle.Background(blinkBG).Foreground(lipgloss.Color("0"))
+	} else if m.detailFieldIndex == currentField {
 		descLabelStyle = descLabelStyle.Background(lipgloss.Color(m.theme.SelectedBG))
 		descValueStyle = descValueStyle.Background(lipgloss.Color(m.theme.SelectedBG))
 	}
 	lines = append(lines, descLabelStyle.Render("Description:"))
-	if t.Description != "" {
+	if m.detailDescEditing {
+		// Show editing indicator
+		editingStyle := lipgloss.NewStyle().
+			Foreground(lipgloss.Color("226")).
+			Italic(true)
+		lines = append(lines, editingStyle.Render("  [Editing in external editor...]"))
+	} else if t.Description != "" {
 		// Highlight search matches if searching
 		desc := t.Description
 		if m.detailSearchRegex != nil && m.detailSearchRegex.MatchString(desc) {
@@ -185,12 +196,12 @@ func (m *Model) renderTaskDetail() string {
 		Foreground(lipgloss.Color("245")).
 		Italic(true)
 	// Check if we're in any editing mode
-	if m.prioritySelecting || m.tagsEditing || m.dueEditing || m.recurEditing {
+	if m.prioritySelecting || m.tagsEditing || m.dueEditing || m.recurEditing || m.detailDescEditing {
 		lines = append(lines, instructionStyle.Render("Editing mode - Follow on-screen prompts"))
 	} else {
 		lines = append(lines, instructionStyle.Render("Press ESC or q to return to table view"))
 		lines = append(lines, instructionStyle.Render("Use ↑/k and ↓/j to navigate fields"))
-		lines = append(lines, instructionStyle.Render("Press i or Enter to edit (Priority, Tags, Due, Recurrence)"))
+		lines = append(lines, instructionStyle.Render("Press i or Enter to edit (Priority, Tags, Due, Recurrence, Description)"))
 		if m.detailSearching {
 			lines = append(lines, instructionStyle.Render("Type to search, Enter to confirm"))
 		} else {
diff --git a/internal/version.go b/internal/version.go
index f10ab7b..0e7e01e 100644
--- a/internal/version.go
+++ b/internal/version.go
@@ -1,4 +1,4 @@
 package internal
 
 // Version is the current version of Task Samurai.
-const Version = "0.9.0"
+const Version = "0.9.1"
diff --git a/tasksamurai b/tasksamurai
index 0c7731e..d845745 100755
--- a/tasksamurai
+++ b/tasksamurai