fix(studies): allow editing external resources on a module

[veniplex]

Summary

• ResourceDialog (src/components/studies/resource-dialog.tsx) already fully supported an edit mode — resource prop, isEdit flag, and calling updateResource on submit — but no caller anywhere ever rendered it in that mode. The module page (src/app/[locale]/(app)/studies/[programId]/[moduleId]/page.tsx) only wired up the "add" create trigger and a delete button per resource row, with no edit entry point at all, so external resources attached to a module could not be edited.
• Added an edit icon trigger to ResourceDialog: when it's rendered uncontrolled with a resource prop, it now shows a small pencil icon button (instead of the "add" button) that opens the same dialog pre-filled for editing.
• Wired this into the module page's resource list, next to the existing delete button, and de-duplicated the note decryption (was decrypted twice per row for display + the new edit payload; now computed once).

Test plan

• npx tsc --noEmit
• npx eslint on changed files
• npx next build
• Manually verify in the browser: open a module, add an external resource, click the new edit icon, change a field, save, and confirm the update persists

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