fix(web): remove unsafe select value casts

[lyzno1]

Summary

• bind dynamic select callbacks back to typed local option lists instead of casting callback strings in JSX
• add a local Webhook method selector and tighten existing schedule/input/subscription/language/theme handlers
• keep touched Select triggers accessible with labels or aria-labels, and convert markdown form enums to erasable const objects for lint

Verification

• web/node_modules/.bin/tsgo --project web/tsconfig.json
• pnpm --dir web exec eslint --cache --quiet app/components/workflow/nodes/trigger-schedule/components/frequency-selector.tsx app/components/workflow/nodes/trigger-webhook/panel.tsx app/signin/one-more-step.tsx app/signin/invite-settings/page.tsx app/components/base/form/components/field/input-type-select/index.tsx app/components/plugins/plugin-detail-panel/subscription-list/create/index.tsx app/components/app/overview/settings/index.tsx app/components/base/theme-selector.tsx app/components/base/markdown-blocks/form.tsx
• pnpm --dir web test app/components/workflow/nodes/trigger-schedule/components/tests/frequency-selector.spec.tsx app/components/workflow/nodes/trigger-webhook/tests/panel.spec.tsx app/components/base/form/components/field/input-type-select/tests/index.spec.tsx app/components/plugins/plugin-detail-panel/subscription-list/create/tests/index.spec.tsx app/components/app/overview/settings/tests/index.spec.tsx

[codecov]

Codecov Report

❌ Patch coverage is 91.11111% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.80%. Comparing base (9a2bea9) to head (bd90410).
⚠️ Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
web/app/components/app/overview/settings/index.tsx	50.00%	3 Missing ⚠️
...in-detail-panel/subscription-list/create/index.tsx	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #36007      +/-   ##
==========================================
- Coverage   85.80%   85.80%   -0.01%     
==========================================
  Files        4453     4453              
  Lines      209844   209846       +2     
  Branches    39334    39333       -1     
==========================================
+ Hits       180054   180055       +1     
- Misses      26576    26577       +1     
  Partials     3214     3214              

Flag	Coverage Δ
dify-ui	94.40% <ø> (ø)
web	86.58% <91.11%> (-0.01%)	⬇️

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