feat: editor visual settings (#928) + soroban-sdk deprecation checker (#933)

[Salmatcre8]

Summary

Two related editor/extension UX features for the v-next milestone:

Closes #928
Closes #933

#928 — Monaco minimap & guide settings (ide/)

Adds visual toggles in Settings → Editor for code-readability features, each persisting to the UserSettingsStore (zustand + localStorage).

• New: ide/src/components/settings/EditorVisualSettings.tsx — minimap, indent-guide, and font-ligature toggles using the existing Switch UI.
• useUserSettingsStore.ts — adds editorMinimap (default off), editorIndentGuides (on), editorFontLigatures (on) + setters; persisted under the existing user-settings key.
• SettingsModal.tsx — renders <EditorVisualSettings /> in the Editor tab.
• CodeEditor.tsx — Monaco options now read these settings (minimap.enabled, guides.indentation, fontLigatures) so changes apply fluidly.

#933 — Soroban SDK deprecation warnings (extension/)

Parses the soroban-sdk version from Cargo.toml manifests and raises a VS Code Problems-panel warning when it's outdated.

• New: extension/src/services/DeprecationChecker.ts — VS Code integration (DiagnosticCollection over Cargo.toml; Warning for deprecated, Information for outdated).
• New: extension/src/services/DeprecationChecker.core.ts — pure, vscode-free parsing/comparison core (semver parse, manifest scan with line/col tracking, classification). Includes a crates.io latest-version lookup with an offline hardcoded fallback.
• extension.ts — registers the checker on activation.
• Handles both soroban-sdk = "x" and { version = "x", features = [...] } forms; ignores git/path deps.

Verified terminal output

#928 — store unit tests (vitest):

$ npx vitest run src/store/__tests__/editorVisualSettings.test.ts
 Test Files  1 passed (1)
      Tests  6 passed (6)

#933 — deprecation core verification (node):

$ node scripts/check-deprecation.js
soroban-sdk DeprecationChecker — verification
latest known (offline floor): 22.0.0
  [PASS] parses simple string dependency
  [PASS] classifies 20.0.0 as deprecated
  [PASS] parses table-form dependency
  [PASS] classifies 19.1.0 as deprecated
  [PASS] strips caret prefix
  [PASS] classifies 21.5.0 as outdated
  [PASS] classifies latest as ok
  [PASS] returns null when soroban-sdk absent
  [PASS] returns null for git dependency
  [PASS] reports correct line index
  [PASS] reports version start column
  [PASS] parseSemVer fills missing minor/patch
ALL CHECKS PASSED

tsc is clean for all five new/changed files of mine. (Note: a full tsc -p ./ on the extension surfaces one pre-existing syntax error in src/services/EventMonitor.ts that is present on main and unrelated to this PR.)

Acceptance criteria

• [UX] Monaco Minimap and Guide Settings #928 — Minimap toggle in Settings modal
• [UX] Monaco Minimap and Guide Settings #928 — Indent guide and font ligature toggles persisting to UserSettingsStore
• [Extension] Soroban SDK Deprecation Warning System #933 — Parse soroban-sdk version from workspace manifest files
• [Extension] Soroban SDK Deprecation Warning System #933 — VS Code problem warning highlighting outdated sdk versions

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