feat(storage-plugin): add hex-first UI for binary entries

[burczu]

Closes #248.

Summary

• Replaces the decimal-array presentation of buffer entries with a hex-first UI across the storage plugin.
• Table cell renders a compact hex preview + byte count: 89 50 4E 47 0D 0A 1A 0A … 128 B.
• Detail dialog renders a standard hexdump with 8-digit lowercase offsets, grouped hex (16/line, double-space gap after byte 8), and an ASCII column (0x20–0x7E printable, others as .).
• Add / Edit dialogs render a CodeMirror-backed BinaryValueEditor for buffer values. Hex is the default mode; Base64 is available for copy/paste workflows. Bytes are the source of truth — switching modes converts in place when the input parses, or clears to a fresh editor when it doesn't.
• Paste normalization rewrites pasted content into canonical grouped hex. Accepted shapes: raw continuous hex, grouped hex, multiline grouped hex, hexdump rows with offsets and |ascii| columns, optional 0x prefixes, mixed case.
• Typing leaves the document alone — single keystrokes pass through unchanged. Trailing nibbles are tolerated; save is disabled until the input is valid.
• Validation messages match the issue: Enter at least one byte., Hex input contains invalid characters., Hex input must contain complete bytes., Base64 input is invalid.
• Internal data model unchanged — buffer is still number[]. No changes to StorageEntry, storage-view.ts, adapters, the runtime hook, or the bridge wire format.
• New CodeMirror devDependencies: @codemirror/state, @codemirror/view, @codemirror/commands. Matches the version pins used by sqlite-plugin.
• Changeset: minor bump for @rozenite/storage-plugin.

Architecture

A pure-function-first posture keeps the spec behavior tests exercisable without RTL/jsdom (which the repo doesn't have set up):

• src/ui/binary.ts — pure helpers: bytesToGroupedHex, bytesToHexdump, bytesToAsciiPreview, bytesToBase64, base64ToBytes, compactBufferPreview, hexInputToBytes (lenient parser stripping hexdump offsets, ASCII columns, 0x prefixes, whitespace).
• src/ui/binary-value-editor-state.ts — pure reducer: initialState, reduce, validate. Handles set-text (preserves user text, re-parses), normalize-paste (rewrites text on success), switch-mode (convert in place / clear on invalid).
• src/ui/binary-value-editor.tsx — thin React wrapper: useReducer + CodeMirror wiring. The update listener short-circuits on round-trips (comparing doc to stateRef.current.text) to avoid loops between the reducer and the editor.

Test plan

Automated (49 tests covering the spec bullets):

• binary.test.ts (30 tests): grouped hex spacing including post-byte-8 gap, hexdump offsets + ASCII column + trailing-line padding, ASCII printable boundary checks, base64 round-trip with arbitrary bytes, compact preview with/without ellipsis, hex parser accepting raw / grouped / multiline / hexdump rows / colon offsets / 0x prefixes / mixed case, hex parser rejecting empty / non-hex / odd-length.
• binary-value-editor-state.test.ts (19 tests): initialState for all input shapes; set-text for valid / invalid chars / partial nibble / cleared / non-canonical-but-valid (verifies text is not rewritten); normalize-paste rewrites hexdump → canonical, base64 → canonical, keeps raw on invalid; switch-mode converts valid in place, clears on invalid, no-op on same mode; validate for empty / invalid / valid.
• pnpm --filter @rozenite/storage-plugin test — 53/53 passing.
• pnpm --filter @rozenite/storage-plugin typecheck — clean.
• pnpm --filter @rozenite/storage-plugin lint — 0 errors (1 pre-existing unrelated warning).
• pnpm --filter @rozenite/docs build — website builds.

Manual (playground, MMKV — others are string-only):

• Table cell shows 89 50 4E 47 0D 0A 1A 0A … N B for buffer entries.
• Detail dialog shows a hexdump with offsets and ASCII column for buffer entries.
• Edit dialog opens populated with canonical grouped hex; editing one byte saves correctly.
• Pasting a hexdump (with offsets and |ascii|) normalizes immediately into grouped hex.
• Typing a single nibble at the end disables save and shows "Hex input must contain complete bytes."
• Toggling to Base64 converts the bytes; toggling back to Hex re-encodes.
• Invalid hex + mode toggle clears the editor.
• Add dialog allows creating a new buffer entry from hex input.

Out of scope

• A full byte-grid hex editor.
• Adapter-specific native dump formats.
• Changes to the StorageEntry contract, adapter APIs, or the storage write pipeline.
• UI test infrastructure (RTL / jsdom) — covered by pure-function and reducer tests instead.