fix: improve chat scroll behavior and dark mode readability

- Smart auto-scroll: only follow SSE stream when user is near bottom (200px threshold), scroll once on send/switch session
- Brighten dark mode text colors (primary #e0→#f0, secondary #a0→#c0, muted #66→#88)
- Fix tool-call panel height to match thinking video (120px→213px)
- Fix tool-call item background invisible in dark mode
- Fix gateway start button using hardcoded dark color

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

.gitignore

@@ -19,7 +19,7 @@ packages/server/data/
 packages/server/node_modules/
 .hermes-web-ui/
 hermes_data/
-
+hermes-dependencies.md
 # Editor directories and files
 .vscode/*
 !.vscode/extensions.json