The file tab stats the file and mounts its panel without reading it. Every
panel, built-in or plugin, gets a PluginFile handle: readText, readBytes, url,
version-checked writeText/writeBytes (PluginFileConflictError unless force),
and watch. useFileText, useFileBytes and useFileUrl read through it, and
Loading joins @getpaseo/plugin/client/ui. Panels own their loading state.
The host document pipeline, the explorer preview cache and the preview
lifecycle are deleted. The daemon classifies a file version from a bounded
sniff and writes base64 content as bytes behind fileByteWrites.
A deleted file keeps its panel mounted; a read confirms the deletion first,
so a remove-and-rewrite is not reported as one. Native Source decodes with
builtins and highlights in idle-time slices, the lines around the opening
line first, so a large file no longer blocks the JS thread.
Adds the pdf-panel and markdown-panel examples, the File panels section of the plugin
reference, and an e2e spec that installs both examples, opens a PDF in the browser
viewer, and edits Markdown through Paseo's document across the switcher, Source,
autosave and conflicts.