Bash common.sh: consolidate docker_cmd/retry_docker/verify_running/emby_api, fix tailscale dups

common.sh gains:
- docker_cmd() + verify_running() + retry_docker() — removed from all 3 Docker_Essentials
  scripts where they were byte-for-byte duplicates
- emby_api(endpoint, [timeout=30]) — removed from 6 Media/Tools scripts that each defined
  their own _emby_api() with the same curl/parse/error pattern; call sites renamed emby_api
- format_duration() extended with days/hours branch (was capped at minutes+seconds)
- notify() comment: scripts do not need to preflight the notify script via validate_unraid_cmd

Tailscale deduplication:
- arr_sync.sh: _resolve_node_ip() and inline block in _delete_remote_item() both replaced
  with resolve_tailscale_ip() from common.sh
- git_pull_execute.sh: inline tailscale ip -4 replaced with resolve_tailscale_ip() (adds
  the tailscale status fallback that was missing)

Docker_Essentials/docker_daily_restart.sh

@@ -152,35 +152,7 @@ fi
 # ── FUNCTIONS ─────────────────────────────────────────────────────────────────────────────────
 # ==============================================================================================
 
-# Wraps docker commands with a 30 second timeout.
-# Prevents a hung Docker daemon from causing the script to hang indefinitely.
-# Usage: docker_cmd docker restart ContainerName
-DOCKER_TIMEOUT=30
-docker_cmd() {
-    timeout "$DOCKER_TIMEOUT" "$@"
-    local exit_code=$?
-    if [[ "$exit_code" -eq 124 ]]; then
-        error "Docker command timed out after ${DOCKER_TIMEOUT}s: $*"
-        return 1
-    fi
-    return "$exit_code"
-}
-
-# Verifies a container is still running after restart.
-# Gives the container a short settle period before checking.
-# Returns 0 if running, 1 if crashed or stopped.
-RESTART_VERIFY_WAIT=5   # seconds to wait before checking state post-restart
-verify_running() {
-    local container="$1"
-    sleep "$RESTART_VERIFY_WAIT"
-    local state
-    state=$(docker inspect -f '{{.State.Running}}' "$container" 2>/dev/null)
-    if [[ "$state" != "true" ]]; then
-        error "$container failed to stay running after restart — may have crashed"
-        return 1
-    fi
-    return 0
-}
+# docker_cmd, verify_running, retry_docker — defined in common.sh
 
 # Builds a dependency-safe restart order from DAILY_RESTART_CONTAINERS.
 # Containers that are dependencies of others restart first.
@@ -247,28 +219,6 @@ check_dependency_delay() {
     fi
 }
 
-# Retries a docker command up to RETRY_COUNT times with SLEEP seconds between attempts.
-# Uses docker_cmd wrapper for timeout protection on each attempt.
-# Usage: retry_docker docker restart ContainerName
-retry_docker() {
-    local attempt=1
-
-    while [[ "$attempt" -le "$RETRY_COUNT" ]]; do
-        log "$ICON_RETRY Attempt $attempt of $RETRY_COUNT: $*"
-
-        if docker_cmd "$@"; then
-            log "Succeeded on attempt $attempt"
-            return 0
-        else
-            warn "Attempt $attempt failed"
-            (( attempt++ ))
-            [[ "$attempt" -le "$RETRY_COUNT" ]] && sleep "$SLEEP"
-        fi
-    done
-
-    error "Command failed after $RETRY_COUNT attempts: $*"
-    return 1
-}
 
 # ==============================================================================================
 # ━━━ Daily Restart ━━━

Docker_Essentials/docker_update_remaining.sh

@@ -151,42 +151,7 @@ fi
 # ── FUNCTIONS ─────────────────────────────────────────────────────────────────────────────────
 # ==============================================================================================
 
-DOCKER_TIMEOUT=30
-docker_cmd() {
-    timeout "$DOCKER_TIMEOUT" "$@"
-    local exit_code=$?
-    if [[ "$exit_code" -eq 124 ]]; then
-        error "Docker command timed out after ${DOCKER_TIMEOUT}s: $*"
-        return 1
-    fi
-    return "$exit_code"
-}
-
-retry_docker() {
-    local attempt=1
-    while [[ "$attempt" -le "$RETRY_COUNT" ]]; do
-        log "$ICON_RETRY Attempt $attempt of $RETRY_COUNT: $*"
-        if docker_cmd "$@"; then
-            log "Succeeded on attempt $attempt"
-            return 0
-        else
-            warn "Attempt $attempt failed"
-            (( attempt++ ))
-            [[ "$attempt" -le "$RETRY_COUNT" ]] && sleep "$SLEEP"
-        fi
-    done
-    error "Command failed after $RETRY_COUNT attempts: $*"
-    return 1
-}
-
-RESTART_VERIFY_WAIT=5
-verify_running() {
-    local container="$1"
-    sleep "$RESTART_VERIFY_WAIT"
-    local state
-    state=$(docker inspect -f '{{.State.Running}}' "$container" 2>/dev/null)
-    [[ "$state" == "true" ]]
-}
+# docker_cmd, retry_docker, verify_running — defined in common.sh
 
 # ==============================================================================================
 # ━━━ Pull Updates ━━━

Docker_Essentials/docker_weekly_restart.sh

@@ -136,55 +136,7 @@ fi
 # ── FUNCTIONS ─────────────────────────────────────────────────────────────────────────────────
 # ==============================================================================================
 
-# Wraps docker commands with a 30 second timeout.
-# Prevents a hung Docker daemon from causing the script to hang indefinitely.
-DOCKER_TIMEOUT=30
-docker_cmd() {
-    timeout "$DOCKER_TIMEOUT" "$@"
-    local exit_code=$?
-    if [[ "$exit_code" -eq 124 ]]; then
-        error "Docker command timed out after ${DOCKER_TIMEOUT}s: $*"
-        return 1
-    fi
-    return "$exit_code"
-}
-
-# Retries a docker command up to RETRY_COUNT times with SLEEP seconds between attempts.
-# Uses docker_cmd wrapper for timeout protection on each attempt.
-retry_docker() {
-    local attempt=1
-
-    while [[ "$attempt" -le "$RETRY_COUNT" ]]; do
-        log "$ICON_RETRY Attempt $attempt of $RETRY_COUNT: $*"
-
-        if docker_cmd "$@"; then
-            log "Succeeded on attempt $attempt"
-            return 0
-        else
-            warn "Attempt $attempt failed"
-            (( attempt++ ))
-            [[ "$attempt" -le "$RETRY_COUNT" ]] && sleep "$SLEEP"
-        fi
-    done
-
-    error "Command failed after $RETRY_COUNT attempts: $*"
-    return 1
-}
-
-# Verifies a container is still running after restart.
-# Gives the container a short settle period before checking.
-RESTART_VERIFY_WAIT=5
-verify_running() {
-    local container="$1"
-    sleep "$RESTART_VERIFY_WAIT"
-    local state
-    state=$(docker inspect -f '{{.State.Running}}' "$container" 2>/dev/null)
-    if [[ "$state" != "true" ]]; then
-        error "$container failed to stay running after restart — may have crashed"
-        return 1
-    fi
-    return 0
-}
+# docker_cmd, retry_docker, verify_running — defined in common.sh
 
 # Builds a dependency-safe restart order from WEEKLY_RESTART_CONTAINERS.
 # Containers that are dependencies of others restart first.