[PB Extension] Remove dev-only changeLexicon command and its menu item

[imnasnainaec]

Remove the dev-only lexicon switcher before release.

• Drop the lexicon.changeLexicon command and its handler type. Selection stays sticky: to change a project's lexicon, clear its lexicon.lexiconCode setting.
• Drop the "Select lexicon..." menu item (which ran that command) and its localized string.
• Document lexicon.selectLexicon, pointing other extensions to lexicon.openSelector instead.
• Tighten lexicon.resolveProject's doc, dropping a stale example (restored selector tabs keep their projectId).

Test plan

• The Scripture editor's lexicon menu no longer shows "Select lexicon...".
• Clearing lexicon.lexiconCode still makes the next lexicon action open the selector.

🤖 Generated with Claude Code

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between b74f17b and 8928172.

📒 Files selected for processing (4)

• platform.bible-extension/contributions/localizedStrings.json
• platform.bible-extension/contributions/menus.json
• platform.bible-extension/src/main.ts
• platform.bible-extension/src/types/lexicon.d.ts

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