fix: sshfs polling, WebSocket broadcast, prompt progress bar, resizable stats panel

- log_watcher: add --reopen-log mode (close/reopen each poll) for sshfs/network
  filesystems; fix nonlocal clients bug causing UnboundLocalError on first broadcast;
  fix list(clients) copy to prevent RuntimeError on concurrent set mutation
- log_parser: capture progress=X.XX from prompt timing lines into Metrics.prompt_progress
- frontend: show progress bar during processing_prompt state with PROMPT N% label;
  widen stats panel to 300px; remove model name truncation; add drag handle on
  right border of stats panel to resize between 280px–840px

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

log_parser.py

@@ -37,10 +37,11 @@ class LoadingInfo:
 
 @dataclass
 class Metrics:
-    prompt_speed: Optional[float] = None   # tokens/sec during prompt eval
-    prompt_tokens: Optional[int] = None    # total prompt tokens
-    gen_speed: Optional[float] = None      # tokens/sec during generation
-    n_decoded: Optional[int] = None        # tokens decoded so far
+    prompt_speed: Optional[float] = None    # tokens/sec during prompt eval
+    prompt_tokens: Optional[int] = None     # total prompt tokens
+    prompt_progress: Optional[float] = None # 0.0–1.0 from live prompt timing lines
+    gen_speed: Optional[float] = None       # tokens/sec during generation
+    n_decoded: Optional[int] = None         # tokens decoded so far
 
 
 @dataclass
@@ -72,7 +73,7 @@ _IDLE_RE = re.compile(r'update_slots: all slots are idle')
 _PROXY_RE = re.compile(r'proxy_reques: proxying request')
 _LAUNCH_RE = re.compile(r'slot launch_slot_:.*processing task')
 _PROMPT_TIMING_RE = re.compile(
-    r'slot print_timing:.*prompt processing, n_tokens =\s+(\d+),.*/ ([\d.]+) tokens per second'
+    r'slot print_timing:.*prompt processing, n_tokens =\s+(\d+), progress = ([\d.]+),.*/ ([\d.]+) tokens per second'
 )
 _GEN_TIMING_RE = re.compile(
     r'slot print_timing:.*n_decoded =\s+(\d+), tg =\s+([\d.]+) t/s'
@@ -137,8 +138,9 @@ class LogParser:
             return self._set(state="processing_prompt")
         if m := _PROMPT_TIMING_RE.search(content):
             metrics = Metrics(
-                prompt_speed=float(m.group(2)),
+                prompt_speed=float(m.group(3)),
                 prompt_tokens=int(m.group(1)),
+                prompt_progress=float(m.group(2)),
                 gen_speed=self._state.metrics.gen_speed,
                 n_decoded=self._state.metrics.n_decoded,
             )