Rename morpheme-editor Reset string key; test store hooks directly

[imnasnainaec]

Three small, independent changes on top of improve-morph-break-ui:

• Fix: reopen the morpheme editor from any breakdown cell. The forms row renders the first morpheme as a <button> and the rest as presentational <span>s; only the button canceled the click's default action. Inside TokenChip's <label>, clicking a later cell was forwarded to the token gloss input, and that focus landed outside the just-opened modal editor and dismissed it — so only the first cell reopened the editor. Now every form cell cancels the default action. jsdom doesn't reproduce label focus-forwarding (and the TokenChip integration test stubs MorphemeBox), so the regression test asserts the preventDefault that suppresses it in a real browser.
• Rename the morpheme-editor "Reset" string key from %interlinearizer_morphemeEditor_delete% to %interlinearizer_morphemeEditor_reset%, and update the TokenChip doc wording. The button is labeled "Reset" and resets the breakdown rather than deleting it, so the key name now matches the label and behavior.
• Test AnalysisStore dispatch hooks directly via renderHook instead of throwaway button-and-click components. Adds a shared renderStoreHook wrapper, drives dispatchers inside act(...), and asserts on result.current. Rendered components are kept only where the DOM is genuinely needed (re-render / render-count assertions, mount/unmount lifecycle). Documented the convention in AGENTS.md.

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[alex-rawlings-yyc]

@alex-rawlings-yyc reviewed 8 files and all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on imnasnainaec).