v2: accounts list + detail pages with inline account linking

[canalesb93]

Summary

Adds the Accounts surface to the v2 SPA: a list page grouped by institution or type, and a per-account detail page that hosts inline rename, exclude, and account linking (which is now scoped to the account it's set up on, since the top-level Account links page was removed in #1098).

What's new

• /v2/accounts — list grouped by institution (default) or type, with a net-worth/assets/liabilities strip, family-member tab filter, dependent badges, credit utilization bars, and inline connection-status pills for accounts on a degraded connection. Pulls from /api/v1/accounts.
• /v2/accounts/$id — balance hero (sign-aware: "Balance owed" for credit/loan, "Current balance" otherwise), inline display-name editor, exclude-from-sync toggle, parent-connection link, the most recent 25 transactions, and an Account links card.
• Account linking inline — the detail page lists every link this account participates in (as primary "covers" or as dependent "attributed to"), with reconcile + unlink dropdown actions. A LinkAccountSheet creates a new primary→dependent link, filtering out ineligible accounts (already-dependent, reverse-link conflicts) the way the backend would. Dependents themselves hide the linking UI to avoid offering an A→B→C chain the backend would reject.
• Account links nav entry removed from the sidebar (it pointed at a page that no longer exists post-v2: simplify-pass over connections stack (stack 7/7) #1098). Setup now reads as Accounts / Connections.

Backend

Untouched — the page uses the existing /api/v1/accounts, /api/v1/accounts/{id}/detail, /api/v1/account-links (list / create / update / delete / reconcile) endpoints via new TanStack Query hooks in web/src/api/queries/{accounts,account-links}.ts. The Account TS type was widened to mirror the full AccountResponse (was a subset).

Conventions

• Routes registered via PAGE_OVERRIDES + an explicit detail route in web/src/main.tsx.
• Reusable atoms (AccountCard, AccountsSummary, account-utils) live under web/src/features/accounts/ — used only by these two routes for now, so feature-scoped per the v2 rules.
• ShadCN toggle-group primitive installed for the institution/type grouping switch.
• The list endpoint returns *_account_id as short_ids (cf. the project's compact-ID convention); the singular endpoints return UUIDs. The links section and link-sheet filter on short_id so the current shape works — noted inline.

Evidence

Validated in Chrome DevTools MCP against make dev on port 8082 (Plaid sandbox data). bun run lint and bun run build both pass.

Accounts list (desktop) — net-worth / assets / liabilities strip, institution grouping, credit-card sign flip on the Platinum row:

Accounts list (mobile, 420px) — same content, single column:

Account detail — credit card — "Balance owed $2,571.04" hero, settings card, empty account-links section, recent transactions:

Account detail — depository with active link — "Current balance $55,807.95", with an active "Primary · Covers → Essential Savings" link in the Account links section:

Link account sheet — primary fixed to the current account, dependent picker filters out ineligible accounts, tolerance defaults to 3 days:

Account detail — dependent state — the "Linked dependent" badge appears, the Link CTA is hidden, and the AccountLinksSection is suppressed:

I exercised the create + delete link flow end-to-end during validation (verified the dependent badge propagates and the link sheet's eligible-dependent filter updates after creation) and cleaned up the test link after capturing evidence.

Test plan

• Click into each account from /v2/accounts and confirm the detail page loads with correct balance / utilization / recent transactions
• Rename an account via the inline editor; confirm the list reflects the new name (cache invalidates on success)
• Toggle "Exclude from sync" and confirm the badge appears in the hero
• Link two of your own accounts via the sheet; confirm the dependent shows the "Linked dependent" badge and the link disappears from the eligible-dependent picker for other accounts
• Unlink via the dropdown menu; confirm the dependent badge clears
• Switch the grouping toggle on the list between Institution and Type and confirm the URL ?group= updates
• On a single-user household, confirm no FamilyTabs render

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