Feat(Platform): add token count to llm-mode and docs

[Guaris]

Exposes an estimated token count beside the copy mode and in the text version of the docs.

I got the idea from this article, where it says:

This one is simpler than it sounds but surprisingly high-leverage: surface token counts on your documentation pages. Ideally in both the llms.txt index and on the pages themselves (as metadata or a page header).

This gives agents the information they need to make smart decisions:

“This page is 8K tokens - I can include it fully in context”
“This page is 150K tokens - I should fetch only the relevant section”
“This page exceeds my context window - I’ll use the summary from llms.txt instead

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[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds approximate token counts to LLM-focused UX surfaces (llm dropdown + llms.txt) so agents can budget context when fetching docs.

Changes:

• Compute per-page token estimates during page data generation and inject tokens into rendered .md frontmatter.
• Refresh token counts post-write based on rendered Markdown and expose per-group + total tokens to llms.txt.
• Display token counts beside the LLM dropdown and in llms.txt listings.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
app/_plugins/hooks/site_post_write.rb	Recomputes token counts after write; adds group and total token aggregates to llms.txt payload.
app/_plugins/generators/page_data.rb	Runs new Data::TokenEstimate processor for pages/docs.
app/_plugins/generators/markdown_pages_generator.rb	Injects tokens: into rendered Markdown frontmatter.
app/_plugins/generators/data/token_estimate.rb	New estimator to set initial page.data['tokens'].
app/_llms.txt	Displays per-page, per-group, and total token counts.
app/_includes/layouts/main.html	Passes page.tokens to the LLM dropdown include.
app/_includes/landing_pages/header.md	Passes page.tokens to the LLM dropdown include (landing pages).
app/_includes/components/llm_dropdown.html	Emits data-tokens for the Vue mount.
app/_assets/javascripts/llm_dropdown.js	Passes parsed token count into Vue app as prop.
app/_assets/javascripts/apps/LLMDropdown.vue	Renders a token-count label when provided.