refactor(editor): migrate to ProseMirror Mark-based ghost text system

- Replace overlay-based GhostTextOverlay.vue with ProseMirror Mark system
- Add AI toggle button with enable/disable functionality
- Implement new copilotPlugin.ts using copilotGhostMark for inline suggestions
- Fix cursor position offset in prompt.py by moving first suffix char to prefix
- Improve API error handling with abort signal support and debug logging
- Update model configuration from gpt-oss:120b to gpt-oss:20b
- Add button tooltips and improve editor styling
- Remove deprecated inlineSuggestionPlugin.ts
- Update README with new architecture diagram and feature documentation

src/utils/api.js

@@ -1,30 +1,62 @@
-export async function fetchSuggestion(prefix, suffix, apiUrl = 'http://localhost:8000/v1/completions') {
-  const res = await fetch(apiUrl, {
-    method: 'POST',
-    headers: { 'Content-Type': 'application/json' },
-    body: JSON.stringify({ prefix, suffix, languageId: 'markdown' }),
-  })
+import { DEBUG, API_URL } from './config.js'
 
-  if (!res.ok) {
-    throw new Error(`HTTP ${res.status}`)
-  }
+export async function fetchSuggestion(prefix, suffix, signal, apiUrl = API_URL) {
+    if (DEBUG) console.log('[Debug] fetchSuggestion called with prefix length:', prefix.length, 'suffix length:', suffix.length)
+    try {
+        const res = await fetch(apiUrl, {
+            method: 'POST',
+            headers: { 'Content-Type': 'application/json' },
+            body: JSON.stringify({ prefix, suffix, languageId: 'markdown' }),
+            signal
+        })
 
-  const reader = res.body?.getReader()
-  if (!reader) throw new Error('No reader available')
+        if (DEBUG) console.log('[Debug] fetchSuggestion response status:', res.status)
+        if (!res.ok) {
+            const errorText = await res.text()
+            throw new Error(`HTTP ${res.status}: ${errorText}`)
+        }
 
-  let text = ''
-  while (true) {
-    const { done, value } = await reader.read()
-    if (done) break
-    const chunk = new TextDecoder().decode(value)
-    const lines = chunk.split('\n').filter(l => l.startsWith('data: '))
-    for (const line of lines) {
-      try {
-        const data = JSON.parse(line.slice(6))
-        if (data.content) text += data.content
-        if (data.done || data.error) break
-      } catch (e) {}
+        const reader = res.body?.getReader()
+        if (!reader) {
+            if (DEBUG) console.log('[Debug] No reader available')
+            throw new Error('No reader available')
+        }
+
+        let text = ''
+        let buffer = ''
+        while (true) {
+            const { done, value } = await reader.read()
+            if (done) break
+            buffer += new TextDecoder().decode(value)
+            
+            const lines = buffer.split('\n')
+            buffer = lines.pop() || ''
+            
+            for (const line of lines) {
+                if (!line.startsWith('data: ')) continue
+                const jsonStr = line.slice(6).trim()
+                if (!jsonStr) continue
+                try {
+                    const data = JSON.parse(jsonStr)
+                    if (data.content) {
+                        text += data.content
+                        if (DEBUG) console.log('[Debug] Added content:', data.content)
+                    }
+                    if (data.done || data.error) break
+                } catch (e) {
+                    if (DEBUG) console.warn('[Debug] JSON parse error for:', jsonStr.substring(0, 50))
+                }
+            }
+        }
+        
+        if (DEBUG) console.log('[Debug] Final suggestion text:', text.substring(0, 100))
+        return text
+    } catch (e) {
+        if (e.name === 'AbortError') {
+            if (DEBUG) console.log('[Debug] Request aborted')
+        } else {
+            if (DEBUG) console.error('[Debug] fetchSuggestion error:', e)
+        }
+        throw e
     }
-  }
-  return text
 }