feat(ux): first-time onboarding, empty states, and copy fixes

Implements the six "propose first" items from the product/UX review:

- "/" now redirects to /dashboard instead of the empty /jobs table --
  a new user's first screen is now an overview with orientation, not
  a data table with zero rows and four filter dropdowns.
- Jobs table gets a real first-time empty state (distinct from "no
  results match your filters") pointing at Add Job and the bookmarklet,
  instead of a bare "No jobs found."
- Match Score card and Candidate Fit tab now each get a one-line
  caption explaining what they are and how they differ (deterministic
  keyword coverage vs. AI opinion) -- they previously sat side by side
  with no explanation of why there are two.
- Google sign-in hint now reflects self-serve signup when
  Auth:AllowRegistration is on, instead of always implying you need an
  existing linked account.
- Quick Search button now shows its keyboard shortcut (Ctrl+K / ⌘K)
  inline instead of being undiscoverable.

job-tracker-ui/src/i18n/translations.ts

@@ -606,6 +606,7 @@ export const translations = {
     googleAvailableToLink: "Available to link",
     googleLinkedDate: "Linked {date}",
     googleSignInHint: "Sign in with a Google account that has already been linked to your Jobbjakt user.",
+    googleSignInHintSelfServe: "Continue with Google. New here? We'll create your account automatically.",
     continueWithGoogle: "Continue with Google",
     signInWithGoogle: "Sign in with Google",
     linkWithGoogle: "Link with Google",
@@ -750,6 +751,9 @@ export const translations = {
     jobTableOverview: "Overview",
     jobTableNoSummaryYet: "No summary yet.",
     jobTableNoJobsFound: "No jobs found.",
+    jobTableEmptyFirstTimeTitle: "No jobs yet — let's fix that.",
+    jobTableEmptyFirstTimeBody: "Click \"Add job\" above to add one manually, or paste a job posting URL. There's also a one-click bookmarklet that captures a posting straight from the page you're viewing.",
+    jobTableEmptyFirstTimeBookmarklet: "Set up the bookmarklet",
     jobTableSetStatus: "Set {status}",
     editJobTitle: "Edit job",
     editJobIntro: "Update job details, timeline status, documents, and notes from one editing workspace.",
@@ -894,6 +898,7 @@ export const translations = {
     jobDetailsFollowUpSent: "Follow-up sent and logged.",
     jobDetailsFollowUpSendFailed: "Failed to send follow-up.",
     jobDetailsHowYouMatch: "How you match",
+    jobDetailsAiFitHint: "AI opinion — strengths, gaps, and a tailored pitch based on your CV and this posting.",
     matchScoreTitle: "Match score",
     matchScoreLoading: "Scoring your CV against this role…",
     matchScoreBand_Strong: "Strong match",
@@ -902,7 +907,7 @@ export const translations = {
     matchScoreBand_Unknown: "Not enough signal",
     matchScoreKeywordsCovered: "{matched}/{total} keywords",
     matchScoreNoSignal: "Add more CV detail or a fuller job description to get a reliable score.",
-    matchScoreDeterministicHint: "Deterministic keyword coverage — no AI, so the score is stable and repeatable.",
+    matchScoreDeterministicHint: "Deterministic keyword coverage — no AI, so the score is stable and repeatable. For a written opinion on strengths and gaps, see the AI section below.",
     matchScoreMatched: "Matched keywords",
     matchScoreMissing: "Missing keywords",
     matchScoreNoneYet: "No matches found yet.",
@@ -1564,6 +1569,7 @@ export const translations = {
     googleAvailableToLink: "Tilgjengelig for kobling",
     googleLinkedDate: "Koblet {date}",
     googleSignInHint: "Logg inn med en Google-konto som allerede er koblet til Jobbjakt-brukeren din.",
+    googleSignInHintSelfServe: "Fortsett med Google. Ny her? Vi oppretter kontoen din automatisk.",
     continueWithGoogle: "Fortsett med Google",
     signInWithGoogle: "Logg inn med Google",
     linkWithGoogle: "Koble til med Google",
@@ -1708,6 +1714,9 @@ export const translations = {
     jobTableOverview: "Oversikt",
     jobTableNoSummaryYet: "Ingen oppsummering ennå.",
     jobTableNoJobsFound: "Ingen jobber funnet.",
+    jobTableEmptyFirstTimeTitle: "Ingen jobber ennå — la oss fikse det.",
+    jobTableEmptyFirstTimeBody: "Klikk \"Legg til jobb\" over for å legge til en manuelt, eller lim inn en lenke til en stillingsannonse. Det finnes også et bokmerke som fanger en annonse rett fra siden du ser på.",
+    jobTableEmptyFirstTimeBookmarklet: "Sett opp bokmerket",
     jobTableSetStatus: "Sett {status}",
     editJobTitle: "Rediger jobb",
     editJobIntro: "Oppdater jobbdetaljer, status i tidslinjen, dokumenter og notater fra ett redigeringsområde.",
@@ -1852,6 +1861,7 @@ export const translations = {
     jobDetailsFollowUpSent: "Oppfølging sendt og loggført.",
     jobDetailsFollowUpSendFailed: "Kunne ikke sende oppfølging.",
     jobDetailsHowYouMatch: "Slik matcher du",
+    jobDetailsAiFitHint: "AI-vurdering — styrker, svakheter og et skreddersydd pitch basert på CV-en din og denne annonsen.",
     matchScoreTitle: "Match-score",
     matchScoreLoading: "Vurderer CV-en mot denne stillingen…",
     matchScoreBand_Strong: "Sterk match",
@@ -1860,7 +1870,7 @@ export const translations = {
     matchScoreBand_Unknown: "For lite grunnlag",
     matchScoreKeywordsCovered: "{matched}/{total} nøkkelord",
     matchScoreNoSignal: "Legg til mer CV-innhold eller en fyldigere stillingstekst for en pålitelig score.",
-    matchScoreDeterministicHint: "Deterministisk nøkkelorddekning — ingen AI, så scoren er stabil og repeterbar.",
+    matchScoreDeterministicHint: "Deterministisk nøkkelorddekning — ingen AI, så scoren er stabil og repeterbar. For en skriftlig vurdering av styrker og svakheter, se AI-seksjonen under.",
     matchScoreMatched: "Treff på nøkkelord",
     matchScoreMissing: "Manglende nøkkelord",
     matchScoreNoneYet: "Ingen treff ennå.",