Open email context for agent, email search across All Mail, cookbook serve polish

- Agent: pass the open email reader (uid/folder/account/from/subject/body
  preview) on every chat submit so 'reply to this' / 'write email saying
  hi' route to ui_control open_email_reply with the right UID instead of
  inventing a new .md draft. Code-level enforcement (chat_routes strips
  create_document + send_email when active_email is set); cross-session
  active_doc_id is now trusted instead of being silently dropped.
  set_active_email/clear_active_email tool-layer helpers in
  tool_implementations.

- ui_control open_email_reply: optional body argument so the agent can
  open-and-write in one call; envelope now forwards uid/folder/account/
  body/panel through tool_output. Tool description sharpened and the
  parser rejects empty bodies on reply/reply-all (forces the agent to
  write rather than open an empty draft).

- Email library: search now runs against [Gmail]/All Mail when the
  current folder is INBOX (archived emails surface). Whirlpool spinner
  + 'Searching…' placeholder while in flight. Each search result is
  stamped with its source folder so clicks open the right email instead
  of whatever shares its UID in INBOX. Search no longer re-applies the
  same text pill locally (which only checks subject/from/snippet, never
  body) so body-only matches don't get dropped after IMAP returns them.
  Initial inbox load bumped 100→500.

- Email favorites: 'Favorite (pin to top)' / 'Unfavorite' in both the
  card menu and the open-reader more menu, backed by a new
  /api/email/flag/{uid}?on=true|false endpoint. Flagged emails always
  bubble to the top of the grid regardless of active sort.

- AI reply in doc editor: never overwrites existing draft text or the
  quoted history. AI suggestion is prepended; AI-generated 'On …
  wrote:' re-quotes are stripped so the original quote isn't visually
  edited.

- Cookbook serve: pre-launch GPU driver / has_gpu / install / version-
  floor checks (vllm minimax_m2 needs 0.10.0+, deepseek_r1 needs 0.7.0
  etc.) before the launch chain starts. Detect 'another model already
  running on this host' and offer Stop & launch (with graceful then
  force tmux kill helpers, port release wait). Per-vendor deep-link
  buttons (vLLM recipe / SGLang cookbook) with hardware hash. Backend
  picker is now a custom dropdown with accent-coloured logos for vLLM,
  SGLang, llama.cpp, Ollama, Diffusers; same glyphs added next to
  package names in Dependencies. Runtime-readiness note moved inside
  the panel (green when ready, red when missing) with an × dismiss.
  Esc collapses the expanded card; expanded card scrolls when it
  overflows; Trust Remote / Auto Tool / Reasoning Parser / Enforce
  Eager / Prefix Caching / Expert Parallel / Speculative / MoE Env on
  one row (Reasoning Parser auto-detected per model family).
  Dtype→Row 1, GPUs→Row 2 (rightmost). Removed redundant GPU 'auto'
  input — command builders read from the GPU button strip. Default
  cookbook open is Download tab.

- Cookbook hwfit: 'Model (latest)' / 'Model (oldest)' header sorts by
  release_date; release dates can be backfilled with the new
  scripts/backfill_model_release_dates.py and recipe metadata pulled
  with scripts/import_from_vllm_recipes.py against the upstream
  vllm-project/recipes catalog (vllm_recipe + min_vllm_version stamped
  on entries).

- Calendar: Quick add hint cycles a random Odysseus-themed example per
  open (wooden horse Friday, crew muster 10am daily, council on
  Ithaca, …). Typing a time like '11pm' in the event title updates
  the hero clock live.

- Doc editor: email-mode Reply button (sparkle icon, accent) opens the
  same Fast/Full + context popover the email reader uses; Ctrl+Alt+M
  toggles markdown preview.

- Memories panel: custom sort picker with per-option icons, default
  'Latest', visible Enabled/Disabled toggle text matching the section
  description style.

src/tool_index.py

@@ -103,7 +103,7 @@ BUILTIN_TOOL_DESCRIPTIONS: Dict[str, str] = {
     "search_chats": "Search past session transcripts across chats.",
     "ask_user": "Ask the user a multiple-choice question to get a decision or clarification. Use this when the task is genuinely ambiguous and the answer changes what you do next — pick between approaches, confirm an assumption, choose among options — instead of guessing. Provide a clear `question` and 2-6 `options` (each with a short `label`, optional `description`). Calling this ENDS your turn: the user sees clickable buttons and their choice arrives as your next message. Don't use it for things you can decide from context or sensible defaults, or for irreversible-action confirmation if a dedicated flow exists.",
     "update_plan": "Write back to the ACTIVE PLAN while executing an approved plan: mark steps done or revise them. After finishing a step call this with the full checklist and that step marked done; when the user asks to change the plan call it with the revised checklist. Always pass the COMPLETE markdown checklist (`- [ ]` / `- [x]`), not a diff. The user's docked plan window updates live. No effect when there is no active plan.",
-    "ui_control": "Control the UI and toggle tools on/off. Use this to turn off / turn on / disable / enable individual tools and features: shell (bash), search (web), research, browser, documents, incognito. Open panels (documents library, gallery, email inbox, sessions, notes, memories/brain, skills, settings, cookbook) via `open_panel <name>`. Use `open_email_reply <uid> <folder> reply` to open an email reply draft document without sending. Also switches between chat/agent modes, changes the current model, and applies/creates themes.",
+    "ui_control": "Control the UI and toggle tools on/off. Use this to turn off / turn on / disable / enable individual tools and features: shell (bash), search (web), research, browser, documents, incognito. Open panels (documents library, gallery, email inbox, sessions, notes, memories/brain, skills, settings, cookbook) via `open_panel <name>`. Use `open_email_reply <uid> <folder> reply` to open an email reply draft document without sending. To pre-fill the reply body in one shot (USE THIS whenever the user told you what to say — opening an empty draft when they asked you to write is wrong), append the body after the mode: `open_email_reply <uid> <folder> reply <body text>`. Body can continue on subsequent lines for multi-line replies. Also switches between chat/agent modes, changes the current model, and applies/creates themes.",
     "list_email_accounts": "List configured email accounts and default status. Use before reading or sending mail when the user mentions Gmail, work mail, custom domain mail, another mailbox, or asks to compare/check multiple inboxes.",
     "list_emails": "List emails for a folder/account, newest first, including read messages by default. Shows subject, sender, date, UID, account, and AI summary. Check inbox, find emails needing replies. Supports account from list_email_accounts for Gmail/work/custom mailboxes. For last/latest/newest email, use max_results=1 and unread_only=false.",
     "read_email": "Read the full content of a specific email by UID or Message-ID. View email body, check details. Supports account from list_email_accounts when the UID belongs to a non-default mailbox.",