Overleaf web-client parity: dashboard, editor, and sync overhaul

Uses the Overleaf open-source code as golden reference throughout.

Project dashboard (official /tag + /project endpoints):
- Sidebar filters (all/yours/shared/archived/trashed) with the web
  client's exact filtering predicates
- Tags: create/edit/delete with the official preset palette, per-row
  chips, bulk add/remove, uncategorized view
- Archive/trash/restore/delete-forever/leave, rename, copy, zip download,
  multi-select bulk actions (parallelized)

Editor:
- Remote cursors rewritten as a layer() overlay ported from Overleaf's
  cursor-highlights — no more inline widgets disturbing line wrapping,
  cursor motion, or IME composition
- Autocomplete ported from Overleaf's completion system: official
  top-hundred snippet data, environment templates, package/class/bib
  style data (verbatim, AGPL), project-wide \ref and \cite completion,
  package commands via the official /project/:id/metadata endpoint,
  brace-aware apply behavior, official keymap precedence
- Fixed completion popup keybindings (Enter/arrows previously fell
  through to the default keymap) and dead Enter/Backspace handlers in
  latexClosing

File sync reliability:
- Two-tier compile-artifact detection: pure build noise is ignored,
  while pdf/docx/gz/bbl sync unless there is concrete local-compile
  evidence — agent-generated figure PDFs now sync (previously all PDFs
  were blanket-ignored)
- Local compile outputs are registered with the bridge so nested-root
  projects don't upload the root PDF as junk
- Upload retry with exponential backoff and permanent-failure parking,
  CSRF refresh with session validation and single-flight guard,
  periodic orphan rescan, sync status surfaced in the status bar
- Official textExtensions list (plus legacy extras) for doc-vs-file
  classification

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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