Add strategy descriptions to web UI dropdown

[JuliusScheuerer]

Summary

• Add i18n-translated strategy descriptions to the anonymization strategy dropdown
• Each <option> has a title attribute with the description (native tooltip)
• A <span> below the dropdown shows the description of the currently selected strategy
• Descriptions update dynamically via updateStrategyDescription() in review.js
• Both German and English translations added (5 keys each)

Test plan

• make check passes (275 tests, 95.50% coverage)
• Manual: hover over dropdown options to see tooltips, change selection to see description update

[greptile-apps]

Greptile Summary

This PR enriches the anonymization strategy dropdown in the web UI with i18n-translated descriptions. Each <option> gains a native title tooltip, and a dynamically updated <span> below the dropdown surfaces the description of the currently selected strategy for users who don't rely on hover tooltips. The implementation is small, self-contained, and well-integrated with the existing i18n and vanilla-JS patterns used throughout the codebase.

• Five strategy.* translation keys added to both en.json and de.json, covering all strategies defined in AnonymizationStrategy — no missing or extra keys.
• results.html injects the description via {{ _('strategy.' + s) }} in the title attribute and adds <span id="strategy-description"> below the dropdown.
• updateStrategyDescription() in review.js reads the selected option's title attribute and writes it to the span, called on both init and every change event via syncStrategyField().
• Minor style note: the local var selected inside updateStrategyDescription() shadows the outer module-level selected object; renaming it to selectedOption would reduce ambiguity.

Confidence Score: 5/5

• Safe to merge — changes are purely additive UI enhancements with no logic impact.
• All four changed files are straightforward: two JSON translation files with correct keys, a minimal HTML addition, and a small JS helper. The only finding is a non-critical variable shadowing (P2 style). No functional regressions introduced.
• No files require special attention.

Important Files Changed

Filename	Overview
src/document_anonymizer/web/static/js/review.js	Adds updateStrategyDescription() helper that reads the title attribute from the selected option and writes it to #strategy-description. Wired into syncStrategyField() so it fires on both init and user-driven changes. Minor variable naming concern (shadows outer selected).
src/document_anonymizer/web/templates/results.html	Adds title attribute to each <option> using the i18n helper and a new <span id="strategy-description"> below the dropdown. Both changes are correctly scoped and safe.
src/document_anonymizer/i18n/translations/en.json	Adds five strategy.* translation keys covering all strategies defined in AnonymizationStrategy. Keys and values are accurate and consistently placed.
src/document_anonymizer/i18n/translations/de.json	Adds five matching strategy.* German translations. Descriptions are accurate and mirror the English entries correctly.

Sequence Diagram

sequenceDiagram
    participant Browser
    participant results.html
    participant review.js
    participant i18n

    Browser->>results.html: Page load / HTMX swap
    results.html->>i18n: _('strategy.' + s) for each option
    i18n-->>results.html: Translated description string
    results.html-->>Browser: <option title="description"> rendered

    Browser->>review.js: DOMContentLoaded → init()
    review.js->>review.js: syncStrategyField()
    review.js->>review.js: updateStrategyDescription()
    review.js-->>Browser: #strategy-description.textContent = option.title

    Browser->>review.js: User changes dropdown (change event)
    review.js->>review.js: syncStrategyField()
    review.js->>review.js: updateStrategyDescription()
    review.js-->>Browser: #strategy-description updated with new description

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