feat: stealth account labeling + personal organization (#20)

[JafetCHVDev]

Stealth account labeling + personal organization
Closes #20

Summary
This PR implements client-side stealth address labeling on the Stellar Receive page, allowing users to assign private labels, organize with tags, search, hide/archive entries, and import/export their label data. All label data is stored exclusively in localStorage and never leaves the user's browser.

Changes
New files
src/lib/stealthLabels.ts — Pure TypeScript storage layer backed by localStorage, keyed per stealth address using the format ${walletPubkey}:${stealthAddress}. Handles CRUD operations, import/export with conflict detection, and a one-time privacy warning flag.
src/hooks/useStealthLabels.ts — React hook wrapping the storage layer with reactive state for seamless integration with the component tree.
src/components/PrivacyTooltip.tsx — One-time dismissible tooltip displayed on first label save: "Labels are stored only in this browser. Clear browser data = lose labels. Wraith never sees them."
src/components/ImportConflictModal.tsx — Modal for resolving conflicts when importing labels that already exist with different values. Provides "Keep Existing", "Overwrite All", and "Cancel" options.
Modified files
src/components/StellarReceive.tsx — Extended StellarStealthRow with inline label editing, tag management, and hide/unhide controls. Extended StellarReceive with search bar, tag filter chips, show hidden toggle, and import/export toolbar. All existing scanning, registration, and withdrawal logic is preserved unchanged.
Features
Inline editable labels — Click the pencil icon next to any stealth address to enter a label. Saves on blur or Enter. Labels are capped at 64 characters to prevent UI breakage.
Tag system — Add tags to any stealth address via the "+ tag" button. Click a tag chip to filter the list to that tag. Remove tags with the × button on hover.
Search — Text input at the top filters stealth addresses by label substring, tag, or address.
Hide / archive — Each row has a hide button (eye-off icon) to declutter the list. Hidden entries are still accessible via the "Show hidden" toggle.
Export / import — "Export" downloads all labels as a JSON file. "Import" opens a file picker, parses the JSON, and merges with conflict resolution if labels already exist.
Privacy warning — On the first label save, a one-time tooltip informs the user that labels are browser-local only.
Privacy & security
Labels are never attached to network requests, telemetry, error reporting, or Sentry breadcrumbs.
Storage is per-wallet — disconnecting and connecting a different wallet shows an empty label store.
Each label is stored as an individual localStorage entry keyed by ${walletPubkey}:${stealthAddress}.
Design
All UI additions follow the existing design system: dark monochrome palette, sharp corners (0 border radius), Space Grotesk headings, Inter body text, JetBrains Mono for code/addresses, and the established Tailwind token classes (surface, primary, outline-variant, etc.).

Testing
vite build passes with no errors.
prettier --check passes on all modified and new files.

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[truthixify]

The labeling primitives (stealthLabels.ts, useStealthLabels.ts, the import conflict modal, the privacy tooltip) are what #20 asked for. Rebase against develop; the diff shows it would revert recent merges in StellarSend/Receive (sponsored withdrawal from #29, validation from #13).

git fetch origin
git rebase origin/develop
git push --force-with-lease

Drop the StellarSend.tsx reverts during the rebase, layer your labeling-UI into the current develop StellarReceive.tsx alongside the existing rows. Thanks @JafetCHVDev.

[truthixify]

The rebase is clean and the labeling work (stealthLabels.ts, useStealthLabels.ts, ImportConflictModal, PrivacyTooltip, integration into StellarReceive) is what #20 needs. One blocker though:

The new src/components/StellarMatchCard.tsx is encoded as UTF-16 LE (BOM 0xFFFE, null bytes between every character) instead of UTF-8. That breaks tsc and the Vite build. Probably a save-as side effect from Windows Notepad or similar.

Quick fix:

# convert in-place to UTF-8 (use whichever your system has)
iconv -f UTF-16LE -t UTF-8 src/components/StellarMatchCard.tsx > /tmp/m.tsx && mv /tmp/m.tsx src/components/StellarMatchCard.tsx
# strip the BOM if iconv didn't
sed -i.bak '1s/^\xEF\xBB\xBF//' src/components/StellarMatchCard.tsx && rm -f src/components/StellarMatchCard.tsx.bak
# verify
file src/components/StellarMatchCard.tsx   # should say "ASCII text" or "UTF-8 Unicode text"
git add src/components/StellarMatchCard.tsx
git commit -m "chore: re-encode StellarMatchCard.tsx as UTF-8"
git push

After that I'll merge. Everything else looks good. Thanks @JafetCHVDev.