UX Text Improvements: Planner Pages (Keywords & Clusters)

IMPROVEMENTS - Planner Module:

Column Labels (Shared across all tables):
- 'Keyword' → 'Search Term'
- 'Volume' → 'Monthly Searches'
- 'Difficulty' → 'Competition Level'
- 'Country' → 'Target Location'
- 'Cluster' → 'Topic Group'
- 'Sector' → 'Topic Area'
- 'Status' → 'Prep Status'
- 'Created' → 'Date Added'

Keywords Page:
- Page title: 'Keywords' → 'Organize Your Keywords'
- Pipeline readiness message simplified:
  - 'Pipeline readiness at 22%' → 'You're 22% ready to start writing'
  - More specific guidance: 'Next step: Group your keywords by topic (36 keywords are ready to organize)'
- Navigation tabs updated:
  - 'Keywords' → 'Keywords (individual terms)'
  - 'Clusters' → 'Topics (keyword groups)'

Clusters Page:
- Page title: 'Keyword Clusters' → 'Topic Groups (Keyword Clusters)'
- Navigation tabs updated with context

These changes affect all pages using these shared column definitions (Keywords, Clusters, Ideas, Content, etc.)

NO CODE CHANGES: Only visible user-facing text updates

frontend/src/config/snippets/columns.snippets.ts

@@ -12,14 +12,14 @@ export const titleColumn = {
 
 export const keywordColumn = {
   key: 'keyword',
-  label: 'Keyword',
+  label: 'Search Term',
   sortable: true,
   width: 'auto',
 };
 
 export const statusColumn = {
   key: 'status',
-  label: 'Status',
+  label: 'Prep Status',
   sortable: true,
   badge: true,
   width: '120px',
@@ -27,7 +27,7 @@ export const statusColumn = {
 
 export const volumeColumn = {
   key: 'volume',
-  label: 'Volume',
+  label: 'Monthly Searches',
   sortable: true,
   numeric: true,
   width: '100px',
@@ -35,7 +35,7 @@ export const volumeColumn = {
 
 export const difficultyColumn = {
   key: 'difficulty',
-  label: 'Difficulty',
+  label: 'Competition Level',
   sortable: true,
   badge: true,
   width: '120px',
@@ -43,7 +43,7 @@ export const difficultyColumn = {
 
 export const countryColumn = {
   key: 'country',
-  label: 'Country',
+  label: 'Target Location',
   sortable: true,
   badge: true,
   width: '120px',
@@ -51,14 +51,14 @@ export const countryColumn = {
 
 export const clusterColumn = {
   key: 'cluster',
-  label: 'Cluster',
+  label: 'Topic Group',
   sortable: true,
   width: '200px',
 };
 
 export const createdColumn = {
   key: 'created_at',
-  label: 'Created',
+  label: 'Date Added',
   sortable: true,
   date: true,
   width: '150px',
@@ -90,7 +90,7 @@ export const wordCountColumn = {
 
 export const sectorColumn = {
   key: 'sector_name',
-  label: 'Sector',
+  label: 'Topic Area',
   sortable: false,
   width: '150px',
 };