OPE-296: Add linear integration for starting sessions from issues (#3235)

* feat(linear): start sessions from Linear issues
Authorize a Linear workspace on this OpenChamber server, map teams to
projects, attach an issue from chat, start a session or worktree from an
issue, and post started/completed/failed comments that open the session.
Hidden in VS Code.

* feat(linear): connect more than one Linear workspace

Store each OAuth grant on this OpenChamber server and keep one current, so Settings can add and switch workspaces without dropping the others. Project mapping is per workspace. Remove the Linear button next to New Chat; start-from-issue stays on New Worktree.

* feat(linear): add a right-hand issues panel

Browse and filter issues in the rail, open a card to change status or start a session, and collapse search plus most filters to icons on a narrow panel.

* feat(linear): open issues in the rail and filter by Linear status

The rail icon only shows after Linear is connected. Clicking a Linear row on work status opens the panel. Status options match the card, including Done, Canceled, and Duplicate. The Integrations experimental warning sits under Third-party integrations.

* fix(linear): use stable OAuth callback broker

* fix(chat): preview Linear issue attachments

The context switch missed linear-issue, so tsc treated the preview helpers as incomplete.

* fix(ui): restore Linear i18n parity and the #2903 sync harness

Turkish was missing the Linear dictionaries, and the subagent test still wrapped only SyncContext after reads moved to SyncRuntimeContext.

* fix(linear): drop changelog hunks and close review races

Keep changelogs out of this PR, restore CodeMirror ranges, ignore stale Linear list pages, and leave a persisted Linear tab open until auth has actually resolved.

* fix(linear): tint active issue filters and clear them in one click

* fix(markdown): read escaped brackets as text, not display math

`\[...\]` is display math in LaTeX and an escaped bracket pair in
CommonMark. The block tokenizer claimed every `\[`, so prose like
`[title \[Bug\] more](url)` was handed to KaTeX: "Bug" rendered as a
centered formula and the block token split the paragraph, tearing the
link into three pieces. Linear, GitHub and any other source that escapes
brackets the way CommonMark requires hit this.

Display math now has to own its line — `\[` starts one and `\]` ends
one. A formula on its own line still renders; `\[` mid-sentence stays an
escape, which is what CommonMark says it is and what prose almost always
means. Inline `\(...\)` keeps the same ambiguity, but inline math is
legitimately mid-sentence, so there is no position to judge it by.

Covered by regression tests, including the verbatim comment body that
surfaced this.

* feat(linear): make session status comments opt-in and public-only

A status comment lands in a Linear workspace the whole team reads, and
the link it carried pointed at whatever origin started the session —
usually loopback or a LAN address. Everyone but its author got a dead
link, and nobody had agreed to the comments in the first place.

Comments are now off until the user turns them on in Settings ->
Integrations -> Linear, and the check lives on the server: the event hub
posts completed and failure without going through the interface, so a
client-side gate would not hold. When the resolved origin is not
publicly reachable the server posts nothing at all rather than a link
only its author can open; `isPublicSessionOrigin` rejects loopback,
private LAN, carrier-grade NAT, link-local and single-label hosts. The
desktop deep-link origin is gone with it, since no one else can follow
one either.

The comment body also dropped the session title. It repeated the issue
the comment already sits on, and issue titles routinely carry brackets
("[Bug] ...") that broke the markdown link. The body is now one short
link, and `sessionTitle` is gone from the route, client and types.

Also caps the dedupe file at the newest 500 sessions; it grew forever.

* fix(linear): match the pull request panel and clear review findings

Comments in the Linear panel now render as the same avatar timeline the
pull request panel uses, with the shared time-format preference instead
of a raw locale string. Comment authors carry `avatarUrl`, which the
GraphQL selection was not requesting.

Review findings from the same pass:

- `status-runtime.js` hand-rolled `typeof` narrowing and failed the
  vendored anti-slop lint; it now parses through `parse.js` like every
  other file in the module.
- `useLinearAuthStore` turned any failed request into `connected: false`
  with `hasChecked: true`. Since the rail icon, the composer entry and
  the worktree option all gate on `connected === true`, one network blip
  hid Linear for the rest of the session, and Settings only re-checked
  when it had never checked. It now keeps the last known status and
  leaves `hasChecked` false so the next caller retries.
- `LinearIssuesView` (1096 lines) was a static import in `ContextPanel`,
  shipping in the main bundle although its rail icon stays hidden until
  a workspace is connected. It is lazy now, like `GitView`.
- Dropped dead code: the unused port helpers left over from the loopback
  callback, two re-exported default values nothing read, and a redundant
  export in `linkedIssues`.
- Integrations is no longer badged beta.

packages/ui/src/components/icon/sprite.ts

@@ -232,6 +232,7 @@ export const iconSpriteData = {
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   "target-fill": `<path d="M12 2C12.5523 2 13 2.44772 13 3C13 3.55228 12.5523 4 12 4C7.58172 4 4 7.58172 4 12C4 16.4183 7.58172 20 12 20C16.4183 20 20 16.4183 20 12C20 11.4477 20.4477 11 21 11C21.5523 11 22 11.4477 22 12C22 17.5228 17.5228 22 12 22C6.47715 22 2 17.5228 2 12C2 6.47715 6.47715 2 12 2ZM12 6C12.5523 6 13 6.44772 13 7C13 7.55228 12.5523 8 12 8C9.79086 8 8 9.79086 8 12C8 14.2091 9.79086 16 12 16C14.2091 16 16 14.2091 16 12C16 11.4477 16.4477 11 17 11C17.5523 11 18 11.4477 18 12C18 15.3137 15.3137 18 12 18C8.68629 18 6 15.3137 6 12C6 8.68629 8.68629 6 12 6ZM18.5713 2.10059C18.8474 2.1006 19.0712 2.32449 19.0713 2.60059V4.42969C19.0716 4.70553 19.2954 4.92866 19.5713 4.92871H21.3994C21.6754 4.92871 21.8992 5.15275 21.8994 5.42871V6.34375L20.0107 8.23242C19.6358 8.60719 19.1268 8.81824 18.5967 8.81836H16.5967L12.707 12.707C12.3165 13.0974 11.6835 13.0975 11.293 12.707C10.9027 12.3165 10.9026 11.6834 11.293 11.293L15.1826 7.4043V5.4043C15.1826 4.87411 15.3928 4.36526 15.7676 3.99023L17.6572 2.10059H18.5713Z" fill="currentColor"/>`,
   "task": `<path d="M19 4H5V20H19V4ZM3 2.9918C3 2.44405 3.44749 2 3.9985 2H19.9997C20.5519 2 20.9996 2.44772 20.9997 3L21 20.9925C21 21.5489 20.5551 22 20.0066 22H3.9934C3.44476 22 3 21.5447 3 21.0082V2.9918ZM11.2929 13.1213L15.5355 8.87868L16.9497 10.2929L11.2929 15.9497L7.40381 12.0607L8.81802 10.6464L11.2929 13.1213Z" fill="currentColor"/>`,
+  "team": `<path d="M12 11C14.7614 11 17 13.2386 17 16V22H15V16C15 14.4023 13.7511 13.0963 12.1763 13.0051L12 13C10.4023 13 9.09634 14.2489 9.00509 15.8237L9 16V22H7V16C7 13.2386 9.23858 11 12 11ZM5.5 14C5.77885 14 6.05009 14.0326 6.3101 14.0942C6.14202 14.594 6.03873 15.122 6.00896 15.6693L6 16L6.0007 16.0856C5.88757 16.0456 5.76821 16.0187 5.64446 16.0069L5.5 16C4.7203 16 4.07955 16.5949 4.00687 17.3555L4 17.5V22H2V17.5C2 15.567 3.567 14 5.5 14ZM18.5 14C20.433 14 22 15.567 22 17.5V22H20V17.5C20 16.7203 19.4051 16.0796 18.6445 16.0069L18.5 16C18.3248 16 18.1566 16.03 18.0003 16.0852L18 16C18 15.3343 17.8916 14.694 17.6915 14.0956C17.9499 14.0326 18.2211 14 18.5 14ZM5.5 8C6.88071 8 8 9.11929 8 10.5C8 11.8807 6.88071 13 5.5 13C4.11929 13 3 11.8807 3 10.5C3 9.11929 4.11929 8 5.5 8ZM18.5 8C19.8807 8 21 9.11929 21 10.5C21 11.8807 19.8807 13 18.5 13C17.1193 13 16 11.8807 16 10.5C16 9.11929 17.1193 8 18.5 8ZM5.5 10C5.22386 10 5 10.2239 5 10.5C5 10.7761 5.22386 11 5.5 11C5.77614 11 6 10.7761 6 10.5C6 10.2239 5.77614 10 5.5 10ZM18.5 10C18.2239 10 18 10.2239 18 10.5C18 10.7761 18.2239 11 18.5 11C18.7761 11 19 10.7761 19 10.5C19 10.2239 18.7761 10 18.5 10ZM12 2C14.2091 2 16 3.79086 16 6C16 8.20914 14.2091 10 12 10C9.79086 10 8 8.20914 8 6C8 3.79086 9.79086 2 12 2ZM12 4C10.8954 4 10 4.89543 10 6C10 7.10457 10.8954 8 12 8C13.1046 8 14 7.10457 14 6C14 4.89543 13.1046 4 12 4Z" fill="currentColor"/>`,
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   "terminal-box": `<path d="M3 3H21C21.5523 3 22 3.44772 22 4V20C22 20.5523 21.5523 21 21 21H3C2.44772 21 2 20.5523 2 20V4C2 3.44772 2.44772 3 3 3ZM4 5V19H20V5H4ZM12 15H18V17H12V15ZM8.66685 12L5.83842 9.17157L7.25264 7.75736L11.4953 12L7.25264 16.2426L5.83842 14.8284L8.66685 12Z" fill="currentColor"/>`,
   "terminal-window": `<path d="M20 9V5H4V9H20ZM20 11H4V19H20V11ZM3 3H21C21.5523 3 22 3.44772 22 4V20C22 20.5523 21.5523 21 21 21H3C2.44772 21 2 20.5523 2 20V4C2 3.44772 2.44772 3 3 3ZM5 12H8V17H5V12ZM5 6H7V8H5V6ZM9 6H11V8H9V6Z" fill="currentColor"/>`,