diff --git a/apps/extension/scripts/test-e2e.ts b/apps/extension/scripts/test-e2e.ts
index 50c7b68f58c..8d1da01cd73 100644
--- a/apps/extension/scripts/test-e2e.ts
+++ b/apps/extension/scripts/test-e2e.ts
@@ -532,14 +532,28 @@ try {
     }
     assert(snapshot.url === `${pageOrigin}/ticket`, 'Source URL contains query or fragment')
   })
-  await check('Selection attaches only the selected excerpt', async () => {
+  await check('A focused read-only custom element attaches only the selected excerpt', async () => {
     await page.evaluate(() => {
       const selected = document.getElementById('selected')
       if (!selected) throw new Error('Missing selection fixture')
+      customElements.define('readable-article', class extends HTMLElement {})
+      const host = document.createElement('readable-article')
+      host.tabIndex = 0
+      selected.replaceWith(host)
+      host.append(selected)
+      host.focus()
       const range = document.createRange()
       range.selectNodeContents(selected)
-      window.getSelection()?.removeAllRanges()
-      window.getSelection()?.addRange(range)
+      const selection = window.getSelection()
+      selection?.removeAllRanges()
+      selection?.addRange(range)
+      if (
+        document.activeElement !== host ||
+        host.isContentEditable ||
+        host.shadowRoot ||
+        selection?.toString() !== selected.textContent
+      )
+        throw new Error('Fixture did not focus and select ordinary custom-element text')
     })
     await capture('Selection')
     await app.waitForFunction(
@@ -551,6 +565,7 @@ try {
         snapshot.text === 'The customer needs a replacement by Friday.',
       'Selection widened beyond the user excerpt'
     )
+    await page.locator('readable-article').evaluate((host) => host.replaceWith(...host.childNodes))
   })
   await check('A focused child frame cannot substitute an old parent-page selection', async () => {
     await page.evaluate(() => {
diff --git a/apps/extension/src/background.ts b/apps/extension/src/background.ts
index 81f6ceb3c7f..b0a76732c7f 100644
--- a/apps/extension/src/background.ts
+++ b/apps/extension/src/background.ts
@@ -55,7 +55,6 @@ function open(tab: chrome.tabs.Tab, trigger: 'page' | 'selection' | 'keyboard')
         active instanceof HTMLElement &&
         (active.isContentEditable ||
           active.matches('iframe,frame,input,textarea,select') ||
-          active.localName.includes('-') ||
           Boolean(chrome.dom.openOrClosedShadowRoot(active)?.activeElement))
       return {
         href: location.href,
diff --git a/apps/extension/src/extract.ts b/apps/extension/src/extract.ts
index 8d0ff20c040..b96882f64f2 100644
--- a/apps/extension/src/extract.ts
+++ b/apps/extension/src/extract.ts
@@ -21,7 +21,6 @@ export function extractPageText(
     active instanceof HTMLElement &&
     (active.isContentEditable ||
       active.matches('input,textarea,select') ||
-      active.localName.includes('-') ||
       chrome.dom.openOrClosedShadowRoot(active)?.activeElement)
   )
     return { error: 'Select text outside an editable or embedded field.' }
diff --git a/apps/sim/app/o/[organizationId]/home/components/composer/composer.tsx b/apps/sim/app/o/[organizationId]/home/components/composer/composer.tsx
index a4c0aaf5e5b..3d9248a4d38 100644
--- a/apps/sim/app/o/[organizationId]/home/components/composer/composer.tsx
+++ b/apps/sim/app/o/[organizationId]/home/components/composer/composer.tsx
@@ -203,7 +203,8 @@ export function Composer({
         history.reset()
         editor.clear()
       },
-      () => editorRef.current.getValue() === raw && attachedFilesRef.current === filesAtSend
+      () => editorRef.current.getValue() === raw && attachedFilesRef.current === filesAtSend,
+      textareaRef.current
     )
   }
 
diff --git a/apps/sim/app/sim-links/[organizationId]/[name]/page.tsx b/apps/sim/app/sim-links/[organizationId]/[name]/page.tsx
index 57ea2d776c3..b1721f0b126 100644
--- a/apps/sim/app/sim-links/[organizationId]/[name]/page.tsx
+++ b/apps/sim/app/sim-links/[organizationId]/[name]/page.tsx
@@ -13,7 +13,8 @@ interface OrganizationLinkPageProps {
 
 /** Bookmarks stay in their exporting organization even after the browser's active team changes. */
 export default async function OrganizationLinkPage({ params }: OrganizationLinkPageProps) {
-  const { organizationId, name } = await params
+  const { organizationId, name: encodedName } = await params
+  const name = decodeURIComponent(encodedName)
   if (!simLinkNameSchema.safeParse(name).success) notFound()
   const routes = organizationRoutes(organizationId)
   const session = await getSession()
diff --git a/apps/sim/app/workspace/[workspaceId]/home/components/user-input/user-input.tsx b/apps/sim/app/workspace/[workspaceId]/home/components/user-input/user-input.tsx
index 3d45acba81c..c857e50a319 100644
--- a/apps/sim/app/workspace/[workspaceId]/home/components/user-input/user-input.tsx
+++ b/apps/sim/app/workspace/[workspaceId]/home/components/user-input/user-input.tsx
@@ -574,7 +574,8 @@ const UserInputImpl = forwardRef<UserInputHandle, UserInputProps>(function UserI
       clearComposer,
       () =>
         editorRef.current.getValue() === raw &&
-        filesRef.current.attachedFiles === currentFiles.attachedFiles
+        filesRef.current.attachedFiles === currentFiles.attachedFiles,
+      currentEditor.textareaRef.current
     )
   }, [chatPlanRequired, workspaceId, onSubmit, clearComposer, acceptSubmission])
 
diff --git a/apps/sim/hooks/use-composer-submission.ts b/apps/sim/hooks/use-composer-submission.ts
index 1dae54c5e10..a0b3b018499 100644
--- a/apps/sim/hooks/use-composer-submission.ts
+++ b/apps/sim/hooks/use-composer-submission.ts
@@ -26,28 +26,40 @@ interface UseComposerSubmissionProps {
 
 export function useComposerSubmission({ scope, mode }: UseComposerSubmissionProps) {
   const active = useRef<PendingComposerSubmission | null>(null)
-  const focusBeforeSend = useRef<HTMLElement | null>(null)
+  const focusAfterSend = useRef<{
+    input: HTMLTextAreaElement
+    initiator: Element | null
+  } | null>(null)
   const [pending, setPending] = useState(false)
 
   useLayoutEffect(() => {
     setPending(false)
     return () => {
       active.current = null
-      focusBeforeSend.current = null
+      focusAfterSend.current = null
     }
   }, [scope, mode])
 
   useLayoutEffect(() => {
     if (pending) return
-    const previous = focusBeforeSend.current
-    focusBeforeSend.current = null
-    if (previous?.isConnected && document.hasFocus() && document.activeElement === document.body) {
-      previous.focus({ preventScroll: true })
+    const focus = focusAfterSend.current
+    focusAfterSend.current = null
+    if (
+      focus?.input.isConnected &&
+      document.hasFocus() &&
+      (document.activeElement === document.body || document.activeElement === focus.initiator)
+    ) {
+      focus.input.focus({ preventScroll: true })
     }
   }, [pending])
 
   const accept = useCallback(
-    (submit: () => unknown, clear: () => void, unchanged: () => boolean) => {
+    (
+      submit: () => unknown,
+      clear: () => void,
+      unchanged: () => boolean,
+      input: HTMLTextAreaElement | null
+    ) => {
       if (active.current) return
       const result = submit()
       if (!(result instanceof PendingComposerSubmission)) {
@@ -55,8 +67,7 @@ export function useComposerSubmission({ scope, mode }: UseComposerSubmissionProp
         return
       }
       active.current = result
-      focusBeforeSend.current =
-        document.activeElement instanceof HTMLElement ? document.activeElement : null
+      focusAfterSend.current = input ? { input, initiator: document.activeElement } : null
       setPending(true)
       void result.ready
         .then((commit) => {
diff --git a/apps/sim/proxy.ts b/apps/sim/proxy.ts
index 93e8aea8b7b..2ef79f36f36 100644
--- a/apps/sim/proxy.ts
+++ b/apps/sim/proxy.ts
@@ -233,7 +233,7 @@ const SUSPICIOUS_UA_PATTERNS = [
 ] as const
 
 /**
- * Handles authentication-based redirects for root paths
+ * Resolves legacy homepage aliases and authentication-based root redirects.
  */
 function handleRootPathRedirects(
   request: NextRequest,
@@ -241,6 +241,12 @@ function handleRootPathRedirects(
 ): NextResponse | null {
   const url = request.nextUrl
 
+  if (url.pathname !== '/sim' && url.pathname.toLowerCase() === '/sim') {
+    const destination = url.clone()
+    destination.pathname = '/'
+    return NextResponse.redirect(destination, 308)
+  }
+
   if (url.pathname !== '/' || url.searchParams.has('home')) {
     return null
   }
diff --git a/apps/sim/scripts/test-browser-extension-e2e.ts b/apps/sim/scripts/test-browser-extension-e2e.ts
index 3a0aa695a99..3446e1984de 100644
--- a/apps/sim/scripts/test-browser-extension-e2e.ts
+++ b/apps/sim/scripts/test-browser-extension-e2e.ts
@@ -2023,35 +2023,52 @@ try {
           assert.equal(manual.length, 1)
           assert(manual[0].text.includes('ORCHID-482') && !manual[0].text.includes('JADE-231'))
 
-          await openScenario(target, `${org ? 'organization' : 'workspace'}-denied`)
-          await expect(input()).toBeVisible()
-          await restricted.bringToFront()
-          const draft = 'Keep this draft if access is unavailable'
-          await input().fill(draft)
-          count = received.length
-          phase = 'denied-send'
-          await input().press('Enter')
-          await expect(
-            shell.getByRole('button', { name: 'Request site access', exact: true })
-          ).toBeEnabled()
-          await expect(input()).toHaveValue(draft)
-          assert.equal(received.length, count)
-          await screenshot(`reference-${org ? 'organization' : 'workspace'}-denied`)
-          const accessNotice = await shell
-            .getByRole('status')
-            .first()
-            .evaluate((status) => status.firstChild?.textContent?.trim())
-          assert(accessNotice)
-          assert.equal(
-            await frame().getByText(accessNotice, { exact: true }).count(),
-            0,
-            'Access guidance covered the composer twice'
-          )
-          await setReference(false)
-          phase = 'opt-out-send'
-          await input().press('Enter')
-          await expect.poll(() => received.length).toBe(count + 1)
-          assert.equal(submittedPages(received[count]).length, 0)
+          for (const gesture of ['keyboard', 'mouse'] as const) {
+            await openScenario(target, `${org ? 'organization' : 'workspace'}-denied-${gesture}`)
+            await expect(input()).toBeVisible()
+            await restricted.bringToFront()
+            const draft = 'Keep this draft if access is unavailable'
+            await input().fill(draft)
+            count = received.length
+            phase = `denied-${gesture}-send`
+            if (gesture === 'keyboard') await input().press('Enter')
+            else
+              await frame()
+                .getByRole('button', { name: org ? 'Send' : 'Send message', exact: true })
+                .click()
+            await expect(
+              shell.getByRole('button', { name: 'Request site access', exact: true })
+            ).toBeEnabled()
+            await expect(input()).toHaveValue(draft)
+            await expect
+              .poll(() => input().evaluate((element) => Boolean(element.closest('[inert]'))))
+              .toBe(false)
+            assert.equal(received.length, count)
+            assert(
+              await frame().evaluate(() => document.hasFocus()),
+              `The denied ${gesture} send must keep the chat document focused`
+            )
+            await expect(input()).toBeFocused()
+            await shell.keyboard.type(' Continue typing after the denied capture.')
+            await expect(input()).toHaveValue(`${draft} Continue typing after the denied capture.`)
+            assert.equal(received.length, count)
+            await screenshot(`reference-${org ? 'organization' : 'workspace'}-denied-${gesture}`)
+            const accessNotice = await shell
+              .getByRole('status')
+              .first()
+              .evaluate((status) => status.firstChild?.textContent?.trim())
+            assert(accessNotice)
+            assert.equal(
+              await frame().getByText(accessNotice, { exact: true }).count(),
+              0,
+              'Access guidance covered the composer twice'
+            )
+            await setReference(false)
+            phase = 'opt-out-send'
+            await input().press('Enter')
+            await expect.poll(() => received.length).toBe(count + 1)
+            assert.equal(submittedPages(received[count]).length, 0)
+          }
         }
       } finally {
         await browserContext.unroute(endpoint)
diff --git a/apps/sim/scripts/test-landing-seo-e2e.ts b/apps/sim/scripts/test-landing-seo-e2e.ts
index bbde6787ee1..6b7171bff39 100644
--- a/apps/sim/scripts/test-landing-seo-e2e.ts
+++ b/apps/sim/scripts/test-landing-seo-e2e.ts
@@ -327,6 +327,34 @@ async function run() {
     assert.deepEqual(failures, [])
   })
 
+  await check(
+    'legacy Sim aliases preserve queries without redirecting the Sim Links entry',
+    async () => {
+      const entry = await get('/sim')
+      assert.equal(entry.status, 307)
+      assert(entry.location, 'The Sim Links entry must offer sign-in')
+      const login = new URL(entry.location, baseUrl)
+      assert.equal(login.pathname, '/login')
+      assert.equal(login.searchParams.get('callbackUrl'), '/sim')
+      for (const path of ['/Sim', '/SIM', '/sIm']) {
+        const { status, location } = await get(`${path}?home&utm_source=legacy`)
+        assert.equal(status, 308, path)
+        assert(location, `${path}: expected the legacy homepage redirect`)
+        const target = new URL(location, baseUrl)
+        assert.equal(target.origin, baseUrl.origin, path)
+        assert.equal(target.pathname, '/', path)
+        assert.deepEqual(
+          [...target.searchParams],
+          [
+            ['home', ''],
+            ['utm_source', 'legacy'],
+          ],
+          path
+        )
+      }
+    }
+  )
+
   await check('integration sitemap dates are per integration, not one catalog date', async () => {
     const mismatches: string[] = []
     for (const integration of integrations) {
diff --git a/apps/sim/scripts/test-sim-links-e2e.ts b/apps/sim/scripts/test-sim-links-e2e.ts
index 29fe5c68115..a3edd66b422 100644
--- a/apps/sim/scripts/test-sim-links-e2e.ts
+++ b/apps/sim/scripts/test-sim-links-e2e.ts
@@ -403,24 +403,30 @@ async function run() {
     await api({ ...outsider, orgId }, '', { expected: 404 })
   })
 
-  await check(
-    'a team bookmark keeps its organization across sign-in and a same-name link elsewhere',
-    async () => {
-      const name = 'managed-help'
-      const path = `/sim-links/${encodeURIComponent(orgId)}/${name}`
-      const destination = 'https://team.example.com/help'
+  await check('team bookmarks preserve encoded names and organization across sign-in', async () => {
+    const destination = 'https://team.example.com/help'
+    for (const name of ['managed-help', 'managed:help@team&docs']) {
+      const path = `/sim-links/${encodeURIComponent(orgId)}/${encodeURIComponent(name)}`
       await create(owner, { name, url: destination })
       await create(outsider, { name, url: 'https://another-team.example.com/help' })
       const signedOut = await send(path, null)
+      assert.equal(signedOut.status, 307, `${name}: expected sign-in redirect`)
       const login = new URL(signedOut.headers.get('location') ?? '/', baseUrl)
-      assert.equal(login.pathname, '/login')
-      assert.equal(login.searchParams.get('callbackUrl'), path)
-      assert.equal((await send(path, member)).headers.get('location'), destination)
+      assert.equal(login.pathname, '/login', name)
+      assert.equal(login.searchParams.get('callbackUrl'), path, name)
+      const opened = await send(path, member)
+      assert.equal(opened.status, 307, `${name}: expected destination redirect`)
+      assert.equal(opened.headers.get('location'), destination, name)
       const denied = await send(path, outsider)
-      assert.equal(denied.status, 404)
-      assert(!denied.headers.get('location'))
+      assert.equal(denied.status, 404, name)
+      assert(!denied.headers.get('location'), name)
     }
-  )
+    for (const encodedName of ['%256Danaged-help', 'managed%2Fhelp']) {
+      const denied = await send(`/sim-links/${encodeURIComponent(orgId)}/${encodedName}`, member)
+      assert.equal(denied.status, 404, encodedName)
+      assert(!denied.headers.get('location'), encodedName)
+    }
+  })
 
   await check(
     'bookmark export requires admin access and drops stale or foreign selections',