docs: document the 1.44 features that were never written up

[kelsos]

Second of three PRs catching the docs up to 1.44. PR 1 (#140) fixed pages that
described a UI 1.44 had replaced; this one adds the twelve features that were
never documented at all. Screenshots are still PR 3.

Everything verified against the v1.44.0 tag. Three things came out different
from what the changelog implied — flagged below.

New sections

The notification area (utilities/index). It had never been documented,
so 1.44's silence-popups feature had nowhere to live. Covers the area and its
four tabs, the silence toggle and the fact that nothing is lost while it is
on, the back-off schedule for a condition that keeps recurring (immediately,
a day, two days, a week, then quiet), and clearing.

Filter bar on three more pages. 1.44 rolled the pill bar out to nine
tables but only history events documented it. Rather than repeat
history/filtering nine times, address book, oracle prices and accounting
rules each get a short section naming the pills that page actually offers and
pointing at the canonical reference for the shared syntax.

Settings

• general — Auto detect tokens on login (opt-in, off by default) and its
  cooldown, 1 to 168 hours, which only appears when the toggle is on and
  which a manual re-detect ignores.
• blockchain — suppressing the "No indexers available" notification per
  chain, and where to undo it.
• blockchain — the recommended-settings dialog after an upgrade changes
  a chain's default indexer, and what it shows for Gnosis.
• account — the integrity check now guarding a premium cloud sync in
  both directions (premium/sync.py on upload, data_handler.py on the
  downloaded copy).

Feature mentions

• Hyperliquid Core tokens as first class assets, keyed by token ID rather
  than a contract address. The string "Hyperliquid" previously appeared
  nowhere in the docs.
• Gnosis Pay Safe migration detection, and which of the two Safes to add.
• Jumping between a rule and its events in both directions.
• Asset search by contract address, with exact symbol/name matches first,
  on the dashboard and on blockchain balances.

Three corrections to the plan, from reading the code

The calendar list was missing far more than the new entries. It named only
"ENS Expiration & Renewal". tasks/calendar.py has six creators: name service
expiry (now covering ENS, Basenames and .gwei, not just ENS),
airdrop claim deadlines, Yearn vesting escrow cliff and full-vest (new in
1.44), CRV vote escrow, VELO/AERO veNFT escrow, and L2 bridging. All six are
now listed.

Logs Directory and Data Directory are not in the in-app ? menu. They are
in the Electron application menu bar's Help menu (electron/main/menu.ts),
which is a different menu with different entries. Documenting them on
utilities/help would have been wrong, so they are on the data directory page
— where someone looking for that folder actually goes — with a pointer from
help. Also notes that Data Directory stays disabled until the backend is up,
and that neither exists when running through Docker in a browser.

Two internal links were already broken. Auditing anchors to confirm PR 1's
page split was safe turned up premium/index.md still linking to
#creating-api-keys and #using-api-keys-in-the-app after those headings
became "API Credentials".

Anchor gate

VitePress validates that a linked page exists but not that its #anchor does,
so a renamed heading breaks inbound links silently. That has now happened
twice — the two above, plus the app's importAddressBook deep link fixed in
PR 1. Both were found by hand and nothing would have caught the next one.

scripts/check-anchors.mjs slugs headings the way VitePress does and fails on
any internal link whose anchor matches no heading on the target page. Wired in
as pnpm run check:anchors and a CI step, alongside the image gate from PR 1.

Verified with a negative control — deliberately reintroduced a broken link and
confirmed the gate fails on it — rather than trusting the green result.

Verification

pnpm run lint, check:images, check:anchors and build all clean.
58 anchored internal links across 71 pages all resolve.