Fix TUI duplicate event handler and harden input validation

[Copilot]

The TUI had a duplicate on_button_pressed method where the second definition silently overrode the first, breaking tab navigation. Additionally, the main() entry point referenced in pyproject.toml was missing.

Bug Fixes

• Merged duplicate on_button_pressed handlers - Tab navigation buttons and action buttons now both work
• Added missing main() function - Entry point for rescrape console script

Hardening

• Input validation:

  • Subreddit names: alphanumeric, underscores, hyphens only
  • Post limit: 1-1000 range with capping
  • Query length: 3-500 characters
  • Sort/time filter normalized to lowercase

• State tracking for export:

  • Added current_subreddit, current_research_query, current_research_results
  • Enabled research results export to Obsidian

UI Improvements

• action_toggle_tab cycles through Results → Research → Log
• action_switch_to_assistant actually switches tabs
• External CSS file loading with inline fallback
• Updated rescrape.tcss with missing selectors (.hidden, #tab_nav, containers)

Tests

• Added 13 TUI-specific tests covering bindings, methods, input validation, and CSS

# Before: second handler overwrote first, breaking tab nav
def on_button_pressed(self, event):  # Tab navigation
    ...
def on_button_pressed(self, event):  # Actions - this was the only one called
    ...

# After: single unified handler
def on_button_pressed(self, event):
    if event.button.id == "show_results_btn":
        self.show_results_tab()
    elif event.button.id == "scrape_button":
        self.start_scraping()
    # ...

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• huggingface.co
  • Triggering command: /usr/bin/python python -m pytest tests/ -v --no-cov (dns block)
  • Triggering command: /usr/bin/python python -m pytest tests/test_tui.py -v --no-cov (dns block)
  • Triggering command: /usr/bin/python python -m pytest tests/test_tui.py tests/test_imports.py tests/test_main.py -v --no-cov (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

consolidation and hardening + TUI review

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