Fix tickets#show comment UI: implement comment creation for

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Fix tickets#show comment UI: implement comment creation for humans

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Description

The tickets#show view has UI for adding comments but it's not implemented - currently throwing a 500 error. Need to implement the comment creation functionality for human users.

## Current State

**File**: Tickets show view (likely `/rails/app/views/tickets/show.html.haml` or similar in Avo/dashboard)

**Problem:**
- Comment form UI exists but backend is missing/broken
- Submitting comment causes 500 error
- Humans cannot add comments via web interface

**Note**: Comments work via MCP (`add_comment` tool), but web UI is broken.

## Requirements

### 1. Fix the 500 Error
- Identify the broken code path
- Fix the controller/action handling comment submission
- Ensure form posts to correct endpoint

### 2. Implement Comment Creation
- Add controller action to handle form submission
- Create comment linked to current ticket
- Set comment author to current human user (not agent)
- Redirect back to ticket show page

### 3. Comment Form UI
- Textarea for comment content
- Comment type selector (note, question, decision)
- Submit button
- Display existing comments with author, timestamp, type

### 4. Human vs Agent Comments
- Human comments: created via web UI, author = human user
- Agent comments: created via MCP tool, author = agent

## Implementation

**Controller action:**
```ruby
# In TicketsController or similar
def create_comment
  @ticket = Ticket.find(params[:id])
  
  @ticket.comments.create!(
    content: params[:comment][:content],
    comment_type: params[:comment][:comment_type] || 'note',
    agent_id: current_user.id,  # or user_id depending on auth
    created_by: 'human'
  )
  
  redirect_to ticket_path(@ticket), notice: "Comment added"
end
```

**Route:**
```ruby
resources :tickets do
  post 'add_comment', to: 'tickets#create_comment', as: :add_comment
end
```

**Form:**
```haml
= form_with url: add_comment_ticket_path(@ticket), local: true do |f|
  = f.text_area :content, rows: 3, placeholder: "Add a comment..."
  = f.select :comment_type, ['note', 'question', 'decision'], selected: 'note'
  = f.submit "Add Comment"
```

## Acceptance Criteria
- [ ] Tickets show page loads without 500 error
- [ ] Comment form displays and submits successfully
- [ ] Comments are created with correct ticket_id
- [ ] Comments show author (human), timestamp, and type
- [ ] Comments created via web UI distinguishable from agent comments
- [ ] Form validation works (content required)
- [ ] Redirect back to ticket show page after submission