feat: add AI agent workspace (#3062)

* chore(ai): remove local AI store now that providers live server-side

The Zustand-based useAIStore has been replaced by the server-side
aiProviders oRPC router (encrypted credentials persisted in DB).
Delete the dead store + tests, drop the ./store export, and remove
zustand/immer deps which are no longer referenced anywhere in
packages/ai/src/.

* feat(agent): archive/delete actions and read-only state for agent threads

- Backend: mark archived threads as read-only in threads.get and reject
  messages.send with CONFLICT when the thread is archived.
- Frontend: render archived threads in the sidebar with muted styling and
  an Archived badge; add a per-thread dropdown menu in the chat header
  with Archive (non-destructive) and Delete (with confirmation); show a
  read-only banner above the message list that disambiguates archived
  vs. missing-resource causes; suppress the Retry and Stop buttons in
  read-only mode.
- Tests: new packages/api/src/services/agent.test.ts covering the
  archived-thread isReadOnly flag and the archived-thread send refusal.

* fix(agent): abort run on archive and verify ownership before deleting thread

- threads.archive: before flipping status, abort any in-flight run controller
  and clear the active-run state on the thread; cleanup failures are logged
  but do not block the status update.
- threads.delete: assert thread ownership via getThread before destructive
  work so an authenticated user cannot wipe another user's attachment rows
  by passing a foreign threadId.

Adds focused tests for both behaviors.

* feat(agent): display patch diffs and surface revert conflicts

Render apply_resume_patch tool messages with a status-aware card (applied/
reverted/conflicted), expandable operation list, and a Revert button that
correctly handles RESUME_VERSION_CONFLICT responses. Adds unit tests for
the inverse-patch builder and the agentService.actions.revert flow.

* chore(agent): remove out-of-scope attachment tests accidentally added in Task 6

The Task 6 commit (73ef1acca) accidentally re-introduced three attachment-
related tests that belong to a separate task:

- `buildAttachmentModelParts > converts text, image, supported binary, and
  unsupported attachments into model parts`
- `agentService.messages.send > persists the user message with file UI parts
  and links selected attachments to it` (was failing — the `ToolLoopAgent`
  mock is not callable as a constructor)
- `agentService.messages.send > rejects attachments that are missing, foreign,
  or already linked before persisting a message`

These were likely re-added during a stash recovery and were not requested
for Task 6, whose scope was limited to the `agentService.actions.revert`
flow. Remove them along with the helpers/fixtures (`buildAttachment`,
`buildActiveThread`, `selectWhereResult`, `selectOrderByResult`) that they
were the only consumers of. `selectLimitResult` is preserved because it is
used by the revert tests.

* chore(agent): configure runtime dependencies

* feat(db): add agent workspace schema

* feat(api): add agent backend services

* feat(web): add agent workspace UI

* chore(agent): remove legacy builder assistant

* test(agent): make agent stream mocks constructible

* chore(web): remove unused resume replacement hook

* feat(api): add unsafe AI base URL flag

* chore(dev): expose local services in compose

* fix(web): normalize resume preview gaps

* feat(api): improve agent tool handling

* feat(web): polish agent workspace UI

* chore: update dependencies

* fix(api,web): address PR review feedback for agent workspace

Security/correctness:
- Restrict AI provider URLs to http/https even in unsafe mode
- Stop exposing Redis on host network by default
- Make .env.local optional and drop app profile in compose.dev.yml
- Store agent attachments with private ACL on S3
- Reset provider test status when provider/model/baseURL changes
- Decouple non-agent AI endpoints from REDIS_URL requirement
- Fix JSON Patch add inverse for existing object members
- Wrap resume patch + agent action insert in db transaction
- Validate partialMessage at runtime and rate-limit attachment uploads
- Add unique index on agent_messages (thread_id, sequence)

UX/bugs:
- Mark agent thread route as ssr: false and guard SSE chunk parsing
- Show config-specific banner only on known configuration error
- Gate AI provider checks behind loading state in resume import
- Fix relative-time formatter blank gap between 45-59 seconds
- Clarify thread delete confirmation message

Polish:
- Raise ENCRYPTION_SECRET minimum to 32 characters
- Bucket AI rate limits by resumeId/threadId/messageId
- Trim form values before submitting AI provider config
- Use single key identifier and nullish-coalesce baseURL display

* fix: address ai agent review feedback

* fix: preserve mobile agent chat state

* docs: add ai agent workspace guides

* feat: introduce design system for Reactive Resume

apps/web/src/components/resume/preview.shared.tsx

@@ -1,11 +1,12 @@
 import type { ResumeData } from "@reactive-resume/schema/resume/data";
+import type { CSSProperties } from "react";
 import { Spinner } from "@reactive-resume/ui/components/spinner";
 import { cn } from "@reactive-resume/utils/style";
 
 export type ResumePreviewProps = {
 	className?: string;
 	data?: ResumeData;
-	pageGap?: React.CSSProperties["gap"];
+	pageGap?: CSSProperties["gap"];
 	pageLayout?: "horizontal" | "vertical";
 	pageScale?: number;
 	pageClassName?: string;
@@ -13,7 +14,6 @@ export type ResumePreviewProps = {
 };
 
 export type ResolvedResumePreviewProps = ResumePreviewProps & {
-	pageGap: React.CSSProperties["gap"];
 	pageLayout: "horizontal" | "vertical";
 	pageScale: number;
 	showPageNumbers: boolean;
@@ -26,7 +26,7 @@ export type PreviewPageSize = {
 
 type ResumePreviewLoaderProps = Pick<ResumePreviewProps, "pageClassName" | "showPageNumbers"> & {
 	pageCount?: number;
-	pageGap?: React.CSSProperties["gap"];
+	pageGap?: CSSProperties["gap"];
 	pageLayout?: "horizontal" | "vertical";
 	pageScale?: number;
 };
@@ -39,7 +39,7 @@ export const DEFAULT_PDF_PAGE_SIZE: PreviewPageSize = {
 };
 
 export const normalizeResumePreviewProps = ({
-	pageGap = 40,
+	pageGap = 16,
 	pageLayout = "horizontal",
 	pageScale = 1,
 	showPageNumbers = false,
@@ -67,25 +67,29 @@ export const getScaledPreviewPageSize = (pageSize: PreviewPageSize, pageScale: n
 	width: pageSize.width * pageScale,
 });
 
+export const getResumePreviewGapValue = (pageGap: CSSProperties["gap"]) =>
+	typeof pageGap === "number" && pageGap !== 0 ? `${pageGap}px` : pageGap;
+
 export const getResumePreviewPageCount = (data?: ResumeData) => Math.max(1, data?.metadata.layout.pages.length ?? 1);
 
 export function ResumePreviewLoader({
 	pageCount = 1,
 	pageClassName,
-	pageGap = 40,
+	pageGap = 16,
 	pageLayout = "horizontal",
 	pageScale = 1,
 	showPageNumbers = false,
 }: ResumePreviewLoaderProps) {
 	const pageSize = getScaledPreviewPageSize(DEFAULT_PDF_PAGE_SIZE, pageScale);
+	const resolvedPageGap = getResumePreviewGapValue(pageGap);
 
 	return (
 		<div
+			style={{ "--resume-preview-page-gap": resolvedPageGap } as CSSProperties}
 			className={cn(
 				"flex justify-start gap-(--resume-preview-page-gap)",
 				pageLayout === "horizontal" ? "flex-row items-start" : "flex-col items-center",
 			)}
-			style={{ "--resume-preview-page-gap": pageGap } as React.CSSProperties}
 		>
 			{Array.from({ length: pageCount }, (_, index) => {
 				const pageNumber = index + 1;