diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index 44500cfd3c..fded680002 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -5,6 +5,9 @@ updates:
     schedule:
       interval: weekly
       time: "06:00"
+    cooldown:
+      default-days-before-reopen: 30
+      default-days: 7
     open-pull-requests-limit: 10
     labels:
       - Dependencies
diff --git a/.github/workflows/cast_deployment.yaml b/.github/workflows/cast_deployment.yaml
index 6b7896860c..be9fe7ec9a 100644
--- a/.github/workflows/cast_deployment.yaml
+++ b/.github/workflows/cast_deployment.yaml
@@ -8,6 +8,9 @@ on:
     branches:
       - master
 
+permissions:
+  contents: read
+
 env:
   NODE_OPTIONS: --max_old_space_size=6144
 
@@ -24,6 +27,7 @@ jobs:
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           ref: dev
+          persist-credentials: false
 
       - name: Setup Node
         uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6.3.0
@@ -59,6 +63,7 @@ jobs:
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           ref: master
+          persist-credentials: false
 
       - name: Setup Node
         uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6.3.0
diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 29ee04fdff..115450e7ad 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -18,6 +18,9 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
   cancel-in-progress: true
 
+permissions:
+  contents: read
+
 jobs:
   lint:
     name: Lint and check format
@@ -25,6 +28,8 @@ jobs:
     steps:
       - name: Check out files from GitHub
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
       - name: Setup Node
         uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6.3.0
         with:
@@ -59,6 +64,8 @@ jobs:
     steps:
       - name: Check out files from GitHub
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
       - name: Setup Node
         uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6.3.0
         with:
@@ -77,6 +84,8 @@ jobs:
     steps:
       - name: Check out files from GitHub
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
       - name: Setup Node
         uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6.3.0
         with:
diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index b05c769df1..445883966f 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -7,6 +7,10 @@ on:
     # The branches below must be a subset of the branches above
     branches: [dev]
 
+permissions:
+  contents: read
+  security-events: write
+
 jobs:
   analyze:
     name: Analyze
@@ -28,6 +32,7 @@ jobs:
           # We must fetch at least the immediate parents so that if this is
           # a pull request then we can checkout the head.
           fetch-depth: 2
+          persist-credentials: false
 
       # If this run was triggered by a pull request event, then checkout
       # the head of the pull request instead of the merge commit.
diff --git a/.github/workflows/demo_deployment.yaml b/.github/workflows/demo_deployment.yaml
index 7244f21e4e..0c81a0a71d 100644
--- a/.github/workflows/demo_deployment.yaml
+++ b/.github/workflows/demo_deployment.yaml
@@ -9,6 +9,9 @@ on:
       - dev
       - master
 
+permissions:
+  contents: read
+
 env:
   NODE_OPTIONS: --max_old_space_size=6144
 
@@ -25,6 +28,7 @@ jobs:
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           ref: dev
+          persist-credentials: false
 
       - name: Setup Node
         uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6.3.0
@@ -60,6 +64,7 @@ jobs:
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           ref: master
+          persist-credentials: false
 
       - name: Setup Node
         uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6.3.0
diff --git a/.github/workflows/design_deployment.yaml b/.github/workflows/design_deployment.yaml
index 0c46adacb0..680f32a134 100644
--- a/.github/workflows/design_deployment.yaml
+++ b/.github/workflows/design_deployment.yaml
@@ -5,6 +5,9 @@ on:
   schedule:
     - cron: "0 0 * * *"
 
+permissions:
+  contents: read
+
 env:
   NODE_OPTIONS: --max_old_space_size=6144
 
@@ -17,6 +20,8 @@ jobs:
     steps:
       - name: Check out files from GitHub
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
 
       - name: Setup Node
         uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6.3.0
diff --git a/.github/workflows/design_preview.yaml b/.github/workflows/design_preview.yaml
index 48d1f87412..104a86d434 100644
--- a/.github/workflows/design_preview.yaml
+++ b/.github/workflows/design_preview.yaml
@@ -10,6 +10,9 @@ on:
     branches:
       - dev
 
+permissions:
+  contents: read
+
 env:
   NODE_OPTIONS: --max_old_space_size=6144
 
@@ -22,6 +25,8 @@ jobs:
     steps:
       - name: Check out files from GitHub
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
 
       - name: Setup Node
         uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6.3.0
diff --git a/.github/workflows/labeler.yaml b/.github/workflows/labeler.yaml
index 91384c1e18..7ef9a96ba0 100644
--- a/.github/workflows/labeler.yaml
+++ b/.github/workflows/labeler.yaml
@@ -1,6 +1,6 @@
 name: "Pull Request Labeler"
 
-on: pull_request_target
+on: pull_request_target # zizmor: ignore[dangerous-triggers] -- safe: only runs actions/labeler, no PR code checkout
 
 jobs:
   triage:
diff --git a/.github/workflows/lock.yml b/.github/workflows/lock.yml
index d2a44922f5..b4eb2de48a 100644
--- a/.github/workflows/lock.yml
+++ b/.github/workflows/lock.yml
@@ -5,6 +5,10 @@ on:
   schedule:
     - cron: "0 * * * *"
 
+permissions:
+  issues: write
+  pull-requests: write
+
 jobs:
   lock:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/nightly.yaml b/.github/workflows/nightly.yaml
index cc5f37e60f..ca185e3555 100644
--- a/.github/workflows/nightly.yaml
+++ b/.github/workflows/nightly.yaml
@@ -21,6 +21,8 @@ jobs:
     steps:
       - name: Checkout the repository
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
 
       - name: Set up Python ${{ env.PYTHON_VERSION }}
         uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6
diff --git a/.github/workflows/relative-ci.yaml b/.github/workflows/relative-ci.yaml
index 22bb409b8f..bf8ad7cc04 100644
--- a/.github/workflows/relative-ci.yaml
+++ b/.github/workflows/relative-ci.yaml
@@ -1,25 +1,39 @@
 name: RelativeCI
 
 on:
+  # zizmor: ignore[dangerous-triggers] -- safe: only downloads artifacts, no PR code checkout
   workflow_run:
     workflows: [CI]
     types:
       - completed
 
+permissions:
+  contents: read
+  actions: read
+
 jobs:
-  upload:
-    name: Upload stats
+  upload-frontend-modern:
+    name: Upload stats (frontend/modern)
     if: ${{ github.event.workflow_run.conclusion == 'success' }}
-    strategy:
-      matrix:
-        bundle: [frontend]
-        build: [modern, legacy]
     runs-on: ubuntu-latest
     steps:
       - name: Send bundle stats and build information to RelativeCI
         uses: relative-ci/agent-action@3c681926017930047fc03acaa35cd6a44efcbfc3 # v3.2.2
         with:
-          key: ${{ secrets[format('RELATIVE_CI_KEY_{0}_{1}', matrix.bundle, matrix.build)] }}
+          key: ${{ secrets.RELATIVE_CI_KEY_frontend_modern }}
           token: ${{ github.token }}
-          artifactName: ${{ format('{0}-bundle-stats', matrix.bundle) }}
-          webpackStatsFile: ${{ format('{0}-{1}.json', matrix.bundle, matrix.build) }}
+          artifactName: frontend-bundle-stats
+          webpackStatsFile: frontend-modern.json
+
+  upload-frontend-legacy:
+    name: Upload stats (frontend/legacy)
+    if: ${{ github.event.workflow_run.conclusion == 'success' }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Send bundle stats and build information to RelativeCI
+        uses: relative-ci/agent-action@3c681926017930047fc03acaa35cd6a44efcbfc3 # v3.2.2
+        with:
+          key: ${{ secrets.RELATIVE_CI_KEY_frontend_legacy }}
+          token: ${{ github.token }}
+          artifactName: frontend-bundle-stats
+          webpackStatsFile: frontend-legacy.json
diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
index 890ea9f614..5a620414fc 100644
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -27,6 +27,8 @@ jobs:
     steps:
       - name: Checkout the repository
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
 
       - name: Set up Python ${{ env.PYTHON_VERSION }}
         uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
@@ -34,13 +36,12 @@ jobs:
           python-version: ${{ env.PYTHON_VERSION }}
 
       - name: Verify version
-        uses: home-assistant/actions/helpers/verify-version@master
+        uses: home-assistant/actions/helpers/verify-version@d56d093b9ab8d2105bc0cb6ee9bcc0ef4ec8b96d # master
 
       - name: Setup Node
         uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6.3.0
         with:
           node-version-file: ".nvmrc"
-          cache: yarn
 
       - name: Install dependencies
         run: yarn install
@@ -74,15 +75,17 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Generate requirements.txt
+        env:
+          GITHUB_REF: ${{ github.ref }}
         run: |
           # Sleep to give pypi time to populate the new version across mirrors
           sleep 240
-          version=$(echo "${{ github.ref }}" | awk -F"/" '{print $NF}' )
+          version=$(echo "$GITHUB_REF" | awk -F"/" '{print $NF}' )
           echo "home-assistant-frontend==$version" > ./requirements.txt
 
       # home-assistant/wheels doesn't support SHA pinning
       - name: Build wheels
-        uses: home-assistant/wheels@2025.12.0
+        uses: home-assistant/wheels@e5742a69d69f0e274e2689c998900c7d19652c21 # 2025.12.0
         with:
           abi: cp314
           tag: musllinux_1_2
@@ -99,11 +102,12 @@ jobs:
     steps:
       - name: Checkout the repository
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
       - name: Setup Node
         uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6.3.0
         with:
           node-version-file: ".nvmrc"
-          cache: yarn
       - name: Install dependencies
         run: yarn install
       - name: Download Translations
@@ -113,7 +117,9 @@ jobs:
       - name: Build landing-page
         run: landing-page/script/build_landing_page
       - name: Tar folder
-        run: tar -czf landing-page/home_assistant_frontend_landingpage-${{ github.event.release.tag_name }}.tar.gz -C landing-page/dist .
+        env:
+          TAG_NAME: ${{ github.event.release.tag_name }}
+        run: tar -czf "landing-page/home_assistant_frontend_landingpage-${TAG_NAME}.tar.gz" -C landing-page/dist .
       - name: Upload release asset
         uses: softprops/action-gh-release@153bb8e04406b158c6c84fc1615b65b24149a1fe # v2.6.1
         with:
diff --git a/.github/workflows/stale.yml b/.github/workflows/stale.yml
index 441f53ca68..9533d5abe0 100644
--- a/.github/workflows/stale.yml
+++ b/.github/workflows/stale.yml
@@ -5,6 +5,10 @@ on:
   schedule:
     - cron: "0 * * * *"
 
+permissions:
+  issues: write
+  pull-requests: write
+
 jobs:
   stale:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/translations.yaml b/.github/workflows/translations.yaml
index e2b3495157..96e664170e 100644
--- a/.github/workflows/translations.yaml
+++ b/.github/workflows/translations.yaml
@@ -8,6 +8,9 @@ on:
     paths:
       - src/translations/en.json
 
+permissions:
+  contents: read
+
 jobs:
   upload:
     name: Upload
@@ -15,6 +18,8 @@ jobs:
     steps:
       - name: Checkout the repository
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
 
       - name: Upload Translations
         run: |