Replace LaTeX math symbols with Unicode before markdown rendering ...

Handles arrows, comparison operators, logic symbols and common math notation
that LLMs produce but marked.js doesn't render.

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

Fix code block copy button on HTTP — same execCommand fallback ...

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

Strip spurious separator rows from GFM tables in markdown renderer ...

Model often emits | --- | --- | --- | rows as visual dividers between
table body rows. fixTables() now tracks whether the header separator has
been seen; any subsequent all-separator pipe row is dropped rather than
passed through to marked.js where it renders as a data row with --- content.

Existing fixes (missing separator injection, mixed row repair) are preserved.

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

Webclient UI improvements + backend fixes ...

Webclient:
- Draft persistence across page refreshes (localStorage, reactive watch)
- Image lightbox modal using UI kit classes on thumbnail click
- Copy button on user and assistant messages
- Selection reply toolbar: select assistant text → quote inserted into input
- User message rendering: proper HTML escaping, styled blockquote for > replies
- Markdown table fix: preprocessor to inject missing separator rows
- Planning status labels (rebuild dist)

Backend:
- Developer profile: enable subagent delegation, increase max_iterations to 35
- share_file: updated description + manual with absolute path requirement and URL sharing
- persona.txt: instructions for quote replies and GFM table format

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

webclient: wrap markdown tables in scrollable container for mobile ...

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

Migrate to Vue webclient; rename old client to old_webclient ...

- client/ → old_webclient/ (vanilla JS client preserved as reference)
- webclient/ — new Vue 3 + Pinia webclient (source + dist build)
- vite.config.js: outDir changed to webclient/dist/
- main.py: serve /assets and /images from webclient/dist/,
  index.html from webclient/dist/index.html
- .gitignore: exclude webclient/node_modules/, include webclient/dist/

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