fix(version): replace hardcoded v3.0.0 with dynamic _skill_version()

render.py, ui.py, and last30days.py had hardcoded "v3.0.0" in titles
and headers while plugin.json was at 3.1.1. Use _skill_version()
(reads from plugin.json at runtime) so version strings stay in sync.

Fixes #284

skills/last30days/scripts/lib/ui.py

@@ -6,6 +6,8 @@ import threading
 import random
 from typing import Optional
 
+from .render import _skill_version
+
 # Check if we're in a real terminal (not captured by Claude Code)
 IS_TTY = sys.stderr.isatty()
 
@@ -509,7 +511,8 @@ def show_diagnostic_banner(diag: dict):
 
     if IS_TTY:
         lines.append(f"{Colors.DIM}┌─────────────────────────────────────────────────────┐{Colors.RESET}")
-        lines.append(f"{Colors.DIM}│{Colors.RESET} {Colors.BOLD}/last30days v3.0.0 - Source Status{Colors.RESET}                 {Colors.DIM}│{Colors.RESET}")
+        _header = f"/last30days v{_skill_version()} - Source Status"
+        lines.append(f"{Colors.DIM}│{Colors.RESET} {Colors.BOLD}{_header}{Colors.RESET}{' ' * (52 - len(_header))}{Colors.DIM}│{Colors.RESET}")
         lines.append(f"{Colors.DIM}│{Colors.RESET}                                                     {Colors.DIM}│{Colors.RESET}")
 
         # Reddit
@@ -556,7 +559,8 @@ def show_diagnostic_banner(diag: dict):
     else:
         # Plain text for non-TTY (Claude Code / Codex)
         lines.append("┌─────────────────────────────────────────────────────┐")
-        lines.append("│ /last30days v3.0.0 - Source Status                 │")
+        _header_plain = f"/last30days v{_skill_version()} - Source Status"
+        lines.append(f"│ {_header_plain}{' ' * (52 - len(_header_plain))}│")
         lines.append("│                                                     │")
 
         if has_reddit and has_scrapecreators: