merge main-updates: add template validator, keyboard shortcuts, export improvements

Revert "remove keyboard shortcuts to comply with huggingface csp policy"

remove keyboard shortcuts to comply with huggingface csp policy

add missing template_validator.py to fix deployment error

Update README.md

Merge remote-tracking branch 'origin/main' into main-updates

fix duplicate export function and sync imports between app.py and utils.py

Update README.md

update export to text format with timestamps and message length metadata

add keyboard shortcuts and ui improvements to space template

fix export conversation bug and update gradio to 5.42.0

update gradio to 5.42.0 and fix export conversation functionality

update config.json upload field

update env var display

add another model; improve link grounding

add gpt-oss-120b

update templates

remove unused support_docs.py module

Merge remote-tracking branch 'origin/main' into main-fixed

add docs.md and img files from origin/main

update app.py: link documentation to remote huggingface url

remove unnecessary config.json and test_app.py files

update project files: add config.json, test_app.py, update app.py, readme, and gitignore

Update docs.md

Update docs.md

Upload march.png

Upload preview-config.png

Upload 13 files

add standalone docs

Update README.md

Update README.md

Update README.md

Update README.md

update README.md with current project details

Merge branch 'main' of https://huggingface.co/spaces/milwright/chatui-helper into main-fixed

update troubleshooting section with nested accordions

Update support_docs.py

update support_docs.py: remove image refs, reorganize structure, fix outdated content

fix preview to match space_template: add dynamic url extraction and api headers

Delete test_complete_system.py

Delete test_themes.py

update course assistant template configuration

improve url grounding by including source urls in context and citation instructions

add test_grounding.py to gitignore

increase primary source character limit to 8000 chars

implement url prioritization with primary (5000 chars) and secondary (2500 chars) sources

fix language instructions in generated space template

add test_complete_system.py to gitignore

append file uploads to system message for consistency

append grounding urls to system message instead of user message